Your 2026 Guide to CPT Code Observation Services

The term CPT code observation used to describe a specific set of codes for patients needing hospital monitoring to see if a full inpatient admission was necessary. But things changed dramatically in 2023, when the old, standalone observation codes were absorbed into the main hospital care codes. This change was a pivotal moment in medical billing, aiming to simplify a notoriously complex area of healthcare administration. For providers, understanding this evolution is not just about compliance; it's about ensuring financial stability and reducing the administrative drag that pulls focus away from patient care. The shift reflects a broader trend in healthcare towards value-based models, where clarity in coding directly supports better outcomes and more efficient resource management. As we move further into this new era, mastering the unified system for hospital and observation care is an essential skill for every clinician and coder. This guide will serve as your comprehensive resource, breaking down the new rules, offering practical examples, and providing strategies to navigate the updated landscape with confidence, ensuring your practice is prepared for the billing challenges of 2026 and beyond.

What Are Observation Services in Healthcare Today

Think of observation services as a clinical "in-between." It's the official status for a patient who is too unwell to be sent home from the emergency department but isn't quite sick enough to justify a full inpatient stay. This period gives physicians time to monitor the patient, run tests, and figure out the right next step. The decision to place a patient under observation is a critical one, based on a physician's judgment that the patient's condition requires further evaluation to determine the need for a full inpatient admission. This intermediate level of care is designed to prevent unnecessary hospitalizations while ensuring patient safety. It allows for a thorough assessment without immediately committing to the higher costs and resources associated with an inpatient stay, making it a crucial tool for both clinical management and hospital resource allocation. It's a dynamic status, often lasting for a short period, typically less than 48 hours, during which the care team gathers more clinical data to make an informed decision about admission or discharge.

In the past, this created a real mess for billing. We had separate CPT codes for "observation" and "inpatient" services, and the line between them was often blurry. This confusion was a major source of billing mistakes, claim denials, and endless administrative headaches for everyone involved. Providers had to navigate two parallel sets of rules, and a change in the patient's status mid-stay could trigger a cascade of complex billing adjustments. This administrative burden often led to significant revenue loss and compliance risks, as coders and billers struggled to keep up with the fluctuating patient status and its impact on code selection. The ambiguity inherent in the old system was a constant source of frustration and a significant drain on healthcare resources that could have been better spent on patient care.

The Shift to a Unified Coding System

To cut through all that confusion, the Centers for Medicare & Medicaid Services (CMS) and the American Medical Association (AMA) made a major change in 2023. They got rid of the old, standalone CPT code observation set entirely. This was a landmark decision driven by widespread feedback from the healthcare community about the inefficiencies and errors caused by the dual-track system. The goal was to create a more intuitive and logical framework for billing hospital-based evaluation and management (E/M) services.

Now, those services are part of a single, unified category: Hospital Inpatient and Observation Care Services. The goal was simple: make things clearer. It essentially merged two confusing, parallel billing tracks into one straightforward system for all hospital-based evaluation and management services. This change aligned the coding structure with the clinical reality that the work performed for a patient under observation is often indistinguishable from the work performed for an inpatient at a similar level of acuity. By creating a single set of codes, the AMA and CMS aimed to reduce administrative complexity and improve the accuracy of billing.

The big idea behind the 2023 update was to let providers choose a code based on the actual work and complexity of care, not on the patient's technical status or physical location within the hospital. This principle puts the focus back on the provider's cognitive effort and the resources required to manage the patient's condition, which is a more equitable and defensible basis for reimbursement.

What This Change Means for Providers

This consolidation makes the entire coding process much more logical. Whether a patient is under observation or formally admitted as an inpatient, you now use the very same set of CPT codes. This new approach helps in a few key ways:

• Less ambiguity: Providers don't have to agonize over which code set to use as a patient's status evolves. The single code set applies regardless of whether the patient is officially "observation" or "inpatient," removing a significant point of confusion and potential error.
• Simpler billing: Using a single code set drastically cuts down on the risk of using a deleted or wrong code, which means cleaner claims from the start. This streamlining leads to a lower denial rate, improved cash flow, and reduced administrative costs associated with rework and appeals.
• Focus on care: Billing can now more accurately reflect the work you're actually doing, with code selection driven by medical decision-making or total time. This allows providers to focus on delivering high-quality patient care, knowing that the billing system supports a logical and fair representation of their clinical efforts.

Ultimately, this change is a fundamental shift toward a more rational and less frustrating system. Getting a firm handle on this new landscape is the key to ensuring accurate reimbursement and staying compliant in 2026 and beyond. Embracing this simplification allows practices to reallocate resources from administrative battles to patient-facing activities, improving both operational efficiency and the quality of care.

A Simpler Approach: Understanding the New Unified Observation Codes

If you’ve been coding for more than a couple of years, you remember the old way of handling observation services. It was a notoriously tricky area. Before 2023, we had to use a completely separate group of CPT code observation categories that were distinct from inpatient codes. This created a ton of administrative friction, especially when a patient’s status flipped from observation to inpatient during their stay. This structural separation meant that a simple change in patient status required a complete change in billing strategy, often retroactively, leading to confusion and a high likelihood of errors. The need to constantly monitor a patient's official designation and apply the correct set of rules was a significant burden on both clinical and administrative staff, detracting from more valuable activities.

You had to juggle two different rulebooks. The now-deleted codes—initial observation care (99218-99220), subsequent observation care (99224-99226), and observation discharge (99217)—forced coders to base their decisions on the patient's official status, not necessarily the complexity of the work being done. This often resulted in a mismatch between the services rendered and the codes billed, creating compliance risks and potential reimbursement issues.

Thankfully, that all changed. The American Medical Association's CPT Editorial Panel recognized the confusion and, effective January 1, 2023, deleted those standalone observation codes. They were folded into the existing hospital inpatient codes, which is a big win for clarity. This move was widely praised by the healthcare industry as a long-overdue simplification. You can find out more about these value-based care initiatives and how CPT changes are supporting modern healthcare models.

The New Selection Criteria: Medical Decision Making or Time

So, what does this mean for day-to-day coding? The constant question of "Is this patient inpatient or observation?" is no longer the primary driver for code selection. Instead, we now use a single, unified code set (99221-99239) for both hospital inpatient and observation care services. This unified approach means the focus has shifted from administrative status to clinical substance.

Choosing the right code level now comes down to one of two key factors:

• Medical Decision Making (MDM): How complex were the patient’s problems? How much data did the provider have to review and analyze? What was the risk of complications from the condition or the treatment itself? MDM is assessed based on three elements: the number and complexity of problems addressed, the amount and/or complexity of data to be reviewed and analyzed, and the risk of complications and/or morbidity or mortality of patient management.
• Total Time: This is the total time the provider spent caring for that patient on the day of the encounter. It’s not just face-to-face time; it includes all the chart review, documentation, and coordination that happens behind the scenes. This comprehensive definition allows providers to capture reimbursement for all the cognitive and administrative work associated with a patient's care on a given day.

This shift rightly puts the focus back on the clinical work being performed, which is a much more logical and defensible way to bill. For any practice aiming to get this right, a solid grasp of fundamental billing rules, such as understanding Medicare billing units is a critical step.

The biggest takeaway here is simplification. Using one set of codes for both inpatient and observation care means billing finally reflects the actual work performed, not just the patient's status on a chart. This alignment is a cornerstone of a more transparent and equitable reimbursement system.

Mapping Old Observation Codes to the New Unified Set (Post-2023)

To help visualize this change, the table below shows how the responsibilities of the old, deleted observation codes have been absorbed by the current, consolidated hospital care codes. This mapping illustrates the direct replacement of the old, confusing structure with a streamlined, logical one.

As you can see, the structure is much more straightforward. Whether the service is initial or subsequent, the selection is based on MDM or time, while discharge management is based purely on the time spent. This clear and consistent framework reduces the cognitive load on coders and providers, allowing them to make faster, more accurate decisions. The consistency in selection criteria across service types further simplifies the process, reinforcing the goal of a more rational coding system.

Getting Your Documentation Right for Spot-On Billing

Let's be blunt: when it comes to getting paid for observation services, your documentation is everything. Think of the medical record as the only evidence you have to support your claim. If it’s flimsy or missing key details, it won’t stand up to scrutiny from an auditor. Accurate and comprehensive documentation is the foundation of compliant billing. It serves as the legal record of the care provided and the primary justification for the services billed. Without it, even the most appropriate clinical care can result in a denied claim. In the world of medical billing, if it wasn't documented, it wasn't done.

With the current, unified code set for hospital and observation care, every single note has to tell a story that justifies the code you've chosen. Anything less is an open invitation for a denial. Your documentation must create a clear and compelling narrative that connects the patient's condition, the provider's actions, and the level of service billed. Auditors are trained to look for these connections, and any gaps or inconsistencies can raise immediate red flags. Therefore, providers and coders must work together to ensure that the medical record is a robust defense of the claim.

The Foundation of an Audit-Proof Medical Record

Your documentation needs to paint a complete picture of why the patient was there and what you did for them. Vague, cookie-cutter notes are the number one reason these claims get kicked back. Each note should be specific to the patient and the encounter, reflecting the unique circumstances of their care.

To make your records bulletproof, they absolutely must include these four elements:

• Detailed Patient History: Don't just stop at the chief complaint. You need a solid history of present illness (HPI), a thorough review of systems (ROS), and the relevant past, family, and social history (PFSH). This information provides the context for the provider's decision-making.
• Comprehensive Exam Findings: Write down everything you find during the physical exam, both the positive and the negative findings. These details are the bedrock of your medical decision-making, providing objective data to support your assessment.
• Complexity of Medical Decision-Making (MDM): This is where you connect all the dots for the reviewer. Spell out the complexity of the problems you're managing, the data you had to review, and the patient's risk of complications. Explicitly state your thought process to leave no room for interpretation.
• Total Provider Time: If you're billing based on time, you have to account for every minute. This includes all the face-to-face time and the behind-the-scenes work you did on the day of the encounter. For a great example of how to structure complete notes, this wound care documentation template is a helpful resource.

A Closer Look at Time-Based Billing

While many providers lean on MDM to select a code level, billing by time can be a more direct route—as long as your documentation is airtight. The clock for your encounter starts the second you begin any patient-related work for the day and doesn't stop until you're done. This method can be particularly advantageous in complex cases that require extensive chart review, data analysis, or care coordination, even if the face-to-face component is brief.

Under the current rules, you have to hit specific time thresholds and document them properly to use time for billing an initial or subsequent CPT code observation service. Each code level in the 99221-99233 series has an associated time threshold that must be met or exceeded on the date of the encounter.

Expert Tip: For time-based billing, you must explicitly state the total time you spent and briefly summarize what you did during that time. A lazy note like, "Spent 45 minutes on patient care" is a huge red flag for auditors and won't cut it. A compliant note might say, "Total time for this encounter was 45 minutes, which included reviewing recent lab results, examining the patient, documenting the visit, and coordinating care with the consulting cardiologist."

For instance, to bill CPT 99221 (the Level 1 code for initial hospital or observation care) using time, your record must show you spent at least 40 minutes of total time on that patient's care on that date. For a follow-up visit, like CPT 99231, the minimum time required is 25 minutes.

And what if the patient is admitted and discharged on the same calendar day? You have to use the dedicated code range 99234-99236. Just remember, you can't bill any other E/M codes for that day, and your level selection will depend on either your total time or the complexity of your MDM. This special set of codes is designed to capture the full scope of work for these short but intensive stays.

Applying Observation Codes in Wound Care Scenarios

Knowing the rules for CPT observation codes is one thing, but applying them correctly in the middle of a busy clinic day is a completely different challenge. Let's walk through a couple of common wound care situations to see how these unified hospital care codes work in the real world. Wound care often involves complex patients with multiple comorbidities, making it a prime area where observation services are utilized to manage acute changes and prevent more serious complications. These scenarios will help bridge the gap between abstract coding guidelines and practical application at the point of care.

Think of these examples as a practical blueprint, helping you connect the abstract coding guidelines to the clinical work you do every day. By examining these real-world cases, you can develop a better intuition for how to document and code for observation services in a way that is both compliant and accurately reflects the level of care provided.

Scenario 1: Diabetic Foot Ulcer Monitoring

Imagine a patient with a diabetic foot ulcer has just undergone debridement. You're concerned about a developing infection, so you place them under observation to keep a close eye on them. You perform the initial evaluation, check their labs and imaging, and coordinate their care with the nursing staff. This is a common and high-stakes clinical situation where careful monitoring can prevent a limb-threatening infection.

• The Clinical Picture: This is a high-risk situation. Post-debridement, the potential for osteomyelitis is a serious concern, especially with a patient's underlying diabetes. The patient's glycemic control, peripheral vascular status, and overall health contribute to the complexity.
• What Your Note Needs to Show: Your documentation is key. It has to paint a clear picture of the debridement's outcome, the patient's comorbidities (like uncontrolled diabetes), and the specific orders you've given for monitoring, such as vital signs or WBC counts. Crucially, it must include your medical assessment of the infection risk. Document your thought process regarding the differential diagnosis and the plan for ruling out serious complications.
• Choosing the Right Code: For this initial day of care, you'll choose from the initial care codes (99221-99223). Your selection will hinge on the complexity of your Medical Decision-Making (MDM) or the total time you spent on the encounter. A high-risk case like this one can easily justify a higher-level MDM due to the significant risk of morbidity.
• Supporting ICD-10 Codes: You'd likely use codes like L97.5- (Non-pressure chronic ulcer of other part of foot), E11.621 (Type 2 diabetes mellitus with foot ulcer), and Z79.4 (Long-term use of insulin). Accurate ICD-10 coding is essential to establish medical necessity for the observation stay.

Scenario 2: Subsequent Care for a Venous Leg Ulcer

Now let's say a patient with a venous leg ulcer and severe lower extremity edema is on their second day of observation. You stop in to perform a follow-up exam, check how they're responding to compression therapy and diuretics, and make some adjustments to their treatment plan. The goal of this subsequent visit is to assess progress and refine the management strategy.

• The Clinical Picture: Your focus here is on the ongoing management of the edema and checking the wound's progress. You are evaluating the patient's response to treatment and monitoring for any adverse effects or new complications.
• What Your Note Needs to Show: Your progress note for the day should detail any changes in the edema, the wound's appearance, and how the patient is tolerating the therapy. Be sure to document any medication adjustments you make. If you're billing based on time, your note must state the total time spent (for example, "Total time spent today was 30 minutes, reviewing progress and updating the care plan."). This documentation provides a clear justification for the subsequent care code.
• Choosing the Right Code: For this follow-up visit, you'll use a subsequent care code (99231-99233). Just like with initial care, the specific code is determined by the day's MDM or the total time you spent. For example, if the patient is stable and the plan is straightforward, a lower-level code may be appropriate. If new problems arise, a higher level of MDM might be justified.
• Supporting ICD-10 Codes: Relevant codes would include I87.2 (Venous insufficiency, chronic, peripheral) and I83.0- (Varicose veins of lower extremities with ulcer). These codes provide the diagnostic context for the ongoing observation care.

Proper application of these codes is crucial. When applying observation codes in specialized areas, understanding the unique considerations, such as those found in value-based wound care, is essential for appropriate coding and patient management. Aligning coding practices with these broader healthcare initiatives ensures that your billing is not only compliant but also supports the overall goals of improved patient outcomes and cost-effective care.

Ultimately, this careful approach ensures your billing accurately reflects the intensity of the care you're providing—a fundamental principle in today's healthcare reimbursement models. This precision is vital for securing appropriate reimbursement and demonstrating the value of your services to payers.

How to Avoid Common Audit Triggers and Denials

Getting observation coding wrong can really hurt your practice's bottom line. Payers watch these claims like a hawk, and even small mistakes can trigger costly denials or full-blown audits. These scrutiny levels are high because observation services have historically been a source of confusion and potential overutilization. Therefore, building a robust and proactive compliance strategy is not just good practice; it's essential for financial survival. The first step to building a more resilient billing process is knowing exactly where things tend to go wrong. By identifying common pitfalls, you can implement targeted interventions to prevent them from occurring in your practice.

Most denials for observation CPT codes boil down to a handful of recurring problems. More often than not, the issue is insufficient documentation—the notes simply don't paint a clear enough picture to justify the level of care billed. Another major red flag is when the documented time doesn't match the time requirements for the code you've submitted. Other common errors include a missing or invalid physician order for observation, or progress notes that fail to demonstrate the continued medical necessity for the hospital stay. These are not minor clerical errors; they are fundamental flaws that undermine the entire claim.

A claim denial isn't just a hiccup in your cash flow; it's a bright, flashing sign that something in your clinical or administrative workflow is broken. Fixing those weak spots is the key to financial stability. Each denial should be treated as a learning opportunity, providing valuable data that can be used to refine processes and prevent future errors.

Understanding and implementing an effective medical billing denial management strategy is non-negotiable for preventing this kind of revenue loss, as this guide explains in detail. A proactive approach to denial management involves not only appealing denied claims but also analyzing denial trends to identify and address root causes.

Fortifying Your Defense Against Denials

You can't afford to just play defense, reacting to denials as they come in. That’s an exhausting and expensive way to run a practice. This reactive cycle consumes valuable administrative resources and creates unpredictable revenue streams. The real win comes from shifting your focus to strengthening your internal processes so these errors don't happen in the first place. A proactive, preventative strategy is far more effective and cost-efficient in the long run.

Here are a few actionable strategies to start protecting your practice today:

• Implement Internal Audits: Make it a habit to review a random sample of observation claims before they go out the door. This proactive check helps you catch documentation gaps and coding mistakes early, turning them into valuable teaching moments for your clinicians. Regular internal audits are one of the most effective tools for maintaining compliance and improving coding accuracy.
• Prioritize Clinician Training: Your providers are your first line of defense. Make sure they are thoroughly trained on the specific documentation needed for MDM and time-based billing for all hospital and observation care codes. Ongoing education is crucial, as coding rules and payer policies can change.
• Mandate a Clear Physician Order: This one is critical. Every observation stay must start with a clear, dated, and timed physician’s order for "observation services." Without that explicit order, the entire claim is basically indefensible in an audit. This order is the foundational document that establishes the medical necessity for the observation stay from the outset.

The Power of Detailed Progress Notes

That initial order is just the beginning. Every progress note that follows needs to continue telling the story of why the patient still needs to be in the hospital under observation. Vague, cookie-cutter notes like "patient stable, continue to monitor" are a huge red flag for auditors because they fail to demonstrate active management. These generic statements provide no insight into the provider's clinical thought process or the ongoing need for hospital-level care.

Instead, each entry should spell out the patient's current status, document any changes (or lack thereof), and explain the clinical thinking behind continuing the observation period. A good progress note will describe the patient's response to treatment, list any new findings, and outline the plan for the next period of care. This level of detail doesn't just support medical necessity—it gives you the concrete evidence needed to justify the CPT code you’re billing. When you empower your team with these best practices, you’ll see a major drop in administrative headaches and finally secure the reimbursement you've rightfully earned. This commitment to documentation excellence transforms the medical record from a simple note into a powerful tool for compliance and financial health.

Automating Observation Coding with AI

Let's be honest. The persistent challenges with observation coding—the documentation gaps, the time-tracking mistakes, the coding inconsistencies—all point back to one core issue. Our manual processes are just not built for the complexity and pace of modern healthcare. Asking a provider to perfectly document every minute and clinical detail while juggling patient care is setting them up for failure. It's a system that practically guarantees errors and lost revenue. This inherent friction between clinical duties and administrative requirements is a primary driver of provider burnout and revenue cycle inefficiency.

Fortunately, this is a problem technology is perfectly suited to solve. AI-powered platforms are stepping in to take on these administrative headaches directly. We're now seeing the real-world impact of ambient clinical intelligence, where the system listens to the natural patient conversation and does the heavy lifting on documentation and coding in the background. This technology works seamlessly within the existing clinical workflow, capturing the necessary data without adding extra steps for the provider.

How AI Uncomplicates Observation Coding

Think of it like having a hyper-efficient medical scribe built right into the exam room. As a physician talks with their patient, this AI technology captures the entire conversation and starts piecing together a structured clinical note in real time. But it's doing much more than just transcribing words. It's understanding the context. The AI can identify key clinical concepts, extract relevant data points, and organize them into a coherent and compliant medical note.

This kind of automation hits the biggest pain points in CPT code observation billing head-on:

• Real-Time Charting: Ambient voice tools create detailed, organized notes during the visit itself. This all but eliminates the "pajama time" providers spend catching up on charts late at night, directly addressing a major contributor to provider burnout.
• Automatic Code Suggestion: The AI analyzes the note for key factors in Medical Decision-Making (MDM) and automatically calculates the total time spent on the encounter. From there, it suggests the most accurate CPT and ICD-10 codes, taking the guesswork out of the equation and ensuring that the final codes are fully supported by the documentation.
• Fewer Human Errors: By handing over the tedious data entry and analysis, AI dramatically reduces the risk of miscalculating time, forgetting a critical detail, or choosing the wrong code level. This consistency and accuracy lead to a cleaner claims process from the very beginning.

This technology fundamentally shifts a provider's attention from clerical work back to clinical work. The administrative burden just melts away. In fact, some practices have found that AI cuts their documentation time by as much as 70%. This reclaimed time can be reinvested into direct patient care, professional development, or simply achieving a better work-life balance.

The Real-World Impact on Your Revenue Cycle

Automating your observation coding process does more than just save time—it has a direct and powerful effect on your practice's bottom line. When your claims are based on complete, accurate, and AI-verified documentation from the start, your entire revenue cycle becomes more predictable and efficient. This leads to a significant improvement in key performance indicators such as first-pass acceptance rate and days in A/R.

Clean claims get out the door faster, which means you get paid faster. It’s that simple. Better still, the built-in accuracy slashes the denial rates that cause so much frustration for billing teams. This frees them up from chasing down appeals to focus on more productive work, such as analyzing payment trends and identifying opportunities for process improvement. You can see how these medical coding automation tools are quickly becoming essential for any practice that wants to improve both its efficiency and financial stability.

For any practice managing observation services, embracing this technology isn't just about keeping up—it's a strategic move toward a more accurate, efficient, and profitable future. It represents a fundamental shift from a reactive, labor-intensive approach to a proactive, technology-driven one.

Answering Your Top Observation Code Questions

Even after the big consolidation in 2023 simplified the CPT codes for hospital and observation care, we still see providers grappling with some tricky real-world scenarios. The shift to a unified system was a major step forward, but nuances in application can still lead to questions. Let's walk through some of the most common questions that pop up in daily practice and get you clear, straightforward answers. Addressing these common points of confusion can help solidify your understanding and build confidence in your coding practices.

How Is Total Time Calculated for Billing?

This is a big one. When you're billing based on time, total time isn't just the minutes you spend face-to-face with the patient. It's a comprehensive count of all the work you do for that patient on that specific calendar day. This is a crucial distinction that many providers miss, often leading them to under-bill for their services.

Think of it as everything that goes into their care, which includes non-face-to-face activities like:

• Digging through charts, lab tests, and imaging results.
• Documenting your findings and the reasoning behind your clinical decisions.
• Coordinating care with specialists, nurses, or other members of the healthcare team.
• Placing orders for medications or follow-up procedures.
• Communicating with the patient or family through the patient portal or over the phone.

Just remember, you have to document the total time you spent and briefly describe the activities you performed to back up the time-based code you choose. A simple attestation of the time and a summary of the activities is sufficient to meet documentation requirements.

What Is the Difference for a Patient Between Observation and Inpatient?

From a clinical standpoint, the care might look and feel exactly the same. The patient is in a hospital bed receiving hospital-level services either way. They are monitored by nurses, seen by physicians, and receive treatments as needed. The real difference, and it’s a crucial one, comes down to their financial responsibility.

A patient's status directly hits their wallet. An observation stay gets billed under Medicare Part B, which often means higher copayments and, importantly, no coverage for a subsequent stay in a skilled nursing facility (SNF). In contrast, an inpatient admission falls under Part A once the deductible is met. For a patient to qualify for SNF coverage, they must have a qualifying inpatient stay of at least three consecutive days. Observation days do not count toward this requirement, which can lead to unexpected and significant out-of-pocket costs for patients needing post-acute care.

Can I Bill for a Stay Less Than 8 Hours?

Absolutely. The old "8-hour rule" is officially a thing of the past, thanks to the 2023 code changes. Before, you generally had to have a patient under observation for at least 8 hours to bill the initial observation care codes. This was a rigid and often arbitrary rule that didn't always align with clinical needs.

Now, with the unified code set, there is no minimum time requirement. Your code selection hinges on the complexity of your Medical Decision-Making (MDM) or the total time you dedicated to the patient's care that day, regardless of how long they physically stayed. This allows for billing that more accurately reflects the intensity of the service provided, even for very short but complex observation stays.

What if a Patient Is Admitted as an Inpatient from Observation?

This is a common transition. If you (or another provider in your same group) decide to admit a patient as an inpatient after a period of observation, all of those services get bundled together. You only bill for the initial inpatient admission using codes 99221-99223. The work performed during the observation portion of the stay is considered part of the initial admission service.

Essentially, all the work you put in during the observation period on that same calendar date is considered part of that initial hospital admission. You can’t bill for both separately. The level of the initial hospital care code should reflect all the E/M services provided on that day, including the assessment that led to the decision to admit. This rule prevents double-billing for services rendered on the same day leading up to the admission.

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