The Ultimate Guide to CPT Codes 99203–99205 (2026): New Patient E/M Billing Explained

Schedule Your Free Consultation

Last week, a family medicine practice in Michigan got audited by Blue Cross. The auditor downcoded 78% of their 99205 claims to 99204, demanding back $47,000. The physicians were furious. "We spent an hour with these patients!" they insisted. "These were complicated visits!" Didn't matter. Their documentation showed moderate medical decision-making, not high complexity. Time spent doesn't automatically justify 99205. MDM does.

That's the problem with CPT codes 99203–99205 physicians think they understand new patient E/M billing until an auditor reviews their charts and downgrades everything. The 2021 E/M changes simplified some things but created new confusion that's still tripping up practices in 2026.

These three codes determine how you get paid for new patient office visits. Bill them wrong and you're either leaving money on the table or setting yourself up for recoupments. Let's break down what you actually need to know.

Understanding CPT Codes 99203–99205

These codes cover new patient office visits. Not established patients those use 99211-99215. New means you haven't seen this patient, or anyone in your group practice, in the past three years.

The difference between 99203, 99204, and 99205 is complexity. Higher complexity means higher reimbursement, but also higher documentation requirements and greater audit risk.

You can select the code based on either medical decision-making (MDM) or total time. Most practices use MDM because it's what they document anyway. Time-based coding works when you spend counseling or coordinating care and can prove the total minutes.

The MDM Framework That Actually Matters

Medical Decision Making drives E/M leveling now. There are three MDM elements, and meeting requirements in two of three determines your level:

•       Number and complexity of problems addressed

•       Amount and complexity of data reviewed

•       Risk of complications and morbidity from management options

Auditors look at your note and score each element. If two elements support the level you billed, you're good. If only one element supports it, they downcode. Simple as that.

What 99203 Actually Requires

This is low complexity MDM. Self-limited or minor problems. Minimal data review. Low risk management decisions.

Example: New patient with acute bronchitis. You review symptoms, prescribe an antibiotic or inhaler, give return precautions. That's it. Straightforward problem, minimal data, low risk prescription. Perfect 99203.

Problems happen when providers bill 99204 or 99205 for visits that are actually this simple. Just because someone is new doesn't mean the visit is complex. Code what you documented, not what you think it should be worth.

99204 Documentation Guidelines

Moderate complexity MDM. This is where most new patient visits fall. You're managing multiple problems, reviewing some data, making moderate-risk decisions.

Example: New patient with uncontrolled hypertension and new-onset chest pain. You review their medication list, check recent lab results, order an EKG, adjust medications, discuss cardiac workup. Multiple problems, data review, moderate risk management. That's 99204.

Document what data you reviewed ("reviewed patient's outside labs from March"), what problems you're addressing ("uncontrolled HTN, concerning chest pain"), and your risk assessment ("moderate risk given cardiac symptoms"). Auditors need to see your thought process.

99205 Requirements (Where Audits Happen)

High complexity MDM. This should be your sickest, most complex patients. Multiple chronic conditions with exacerbations, extensive data review, high-risk decisions.

Example: New patient with poorly controlled diabetes, chronic kidney disease, recent MI, now presenting with suspected acute infection. You review extensive outside records, labs, imaging. You're managing multiple high-risk conditions simultaneously. High complexity problems, extensive data, high risk. That justifies 99205.

The problem? Practices overuse 99205. They bill it for patients who don't actually meet high complexity criteria. Auditors specifically target 99205 usage patterns. If you're billing it more than 20-25% of new visits, expect scrutiny.

Your documentation needs to scream complexity. List every problem addressed. Document every piece of data reviewed. Explain why your management decisions carry high risk. Make it obvious this was a complex visit.

Time-Based Billing: When It Works

You can select E/M level by time instead of MDM if you document total time spent on the date of encounter. Total time includes:

•       Preparing to see the patient

•       Obtaining history and performing exam

•       Counseling and educating the patient

•       Ordering tests and medications

•       Documenting in the medical record

•       Communicating with other providers

What doesn't count: Travel time. Time spent on separately billable procedures. Time staff spends without you present.

If you're billing by time, document it. "Total time spent: 52 minutes." Don't estimate. Track actual time or you're vulnerable on audit.

The Mistakes That Cost Practices Money

We see these E/M billing errors constantly:

Billing 99205 for Every Complex Patient

Patient has five chronic conditions. Must be 99205, right? Wrong. Complexity isn't about diagnosis count. It's about what problems you actively addressed today and how complex your decisions were. Managing stable chronic conditions doesn't automatically equal high complexity.

Undercoding Out of Fear

Some practices got burned on audits and now code everything as 99203 or 99204, even when 99205 is clearly justified. That's leaving money on the table. If your documentation supports high complexity, bill high complexity.

Ignoring Data Review

You reviewed five pages of outside records and lab results but didn't document it. Auditors can't give you credit for data review they can't see. "Reviewed recent labs" doesn't count. "Reviewed CBC from 3/15 showing anemia, reviewed CMP from 3/15 showing elevated creatinine" counts.

Confusing New vs Established

Patient saw your partner two years ago. That's still established, not new. New means nobody in your group practice has seen them in three years. Bill the wrong series (99203-99205 vs 99212-99215) and you're coding fraud, even if accidental.

What's Happening With E/M Audits in 2026

Payers are using data analytics to identify outlier E/M coding patterns. If your 99205 utilization rate is significantly higher than peers, you're getting flagged for review.

We're seeing more documentation-based audits where payers pull charts and downcode based on insufficient MDM documentation. They're looking for providers who bill high but document low.

Medicare especially is watching E/M coding closely. They publish data on specialty-specific E/M distributions. Outliers face increased scrutiny and potential recoupments.

Protecting Your Revenue

Don't wait for audit letters. Here's what works:

•       Build MDM-focused templates: Documentation should prompt for problems addressed, data reviewed, and risk assessment.

•       Audit internally: Pull random E/M charts monthly. Score MDM elements. See if documentation supports codes billed.

•       Train providers: Most physicians don't understand MDM framework. Teach them what elements auditors score.

•       Work with billing experts: Professional RCM teams understand E/M nuances and catch coding errors before claims submit.

Common E/M Questions

What's the actual difference between 99203 and 99204?

MDM complexity. 99203 is low complexity straightforward problems, minimal data, low risk. 99204 is moderate complexity multiple problems or chronic conditions, some data review, moderate risk management. If you're doing more than handling simple acute issues, you're probably in 99204 territory.

Can 99205 really be billed frequently?

Yes, if your documentation supports it. But high utilization triggers audits. If you're billing 99205 more than 20-25% of new visits, payers will review your charts. Make sure every 99205 has documentation showing high complexity MDM across multiple elements.

How exactly is MDM calculated?

Three elements: problems addressed, data reviewed, risk of management. Each element gets scored as straightforward, low, moderate, or high. Two of three elements must meet the level you're billing. Auditors literally score your note and see if two elements support the code.

Can time override MDM?

Yes. You can select E/M level by either MDM or time. If you document total time spent and it meets the threshold, you can bill that level even if MDM doesn't support it. But you must document actual time and what you spent it on.

What specifically triggers a 99205 audit?

High utilization rate compared to peers. Payers run analytics showing your 99205 percentage versus specialty average. Outliers get reviewed. Also, systematic patterns like billing 99205 for every new patient regardless of complexity trigger audits fast.

What makes someone a new patient?

Nobody in your group practice has provided professional services to them in the past three years. If your partner saw them two years ago, they're established. If you saw them four years ago, they're new. Group practice matters any provider in your practice counts, not just you personally.