CPT Code 99204Complete Billing & Coding Guide (2026)New patient office visit, moderate MDM or 45-59 minutes
About CPT 99204
CPT 99204 covers new patient visits with moderate-complexity medical decision making OR 45-59 minutes of total time. Requires two or more chronic conditions, acute illness with systemic symptoms, or an undiagnosed problem with uncertain prognosis.
Common scenarios: New patient with diabetes and hypertension, comprehensive workup for chronic symptoms.
Office and outpatient E/M codes are the most-audited line items in physician billing. The 2021 MDM-or-time selection rules created ambiguity that payers actively work in their favor through downcoding algorithms. Documentation that explicitly maps to the chosen MDM elements (or that records total time on the date of service) is the difference between getting paid the level you billed and getting downcoded silently.
When billing 99204 with a procedure on the same day, use modifier 25 to indicate a significant, separately identifiable E/M service. Documentation must support the separate work, including a distinct chief complaint or HPI section if applicable.
Code Properties
RVU Breakdown
Every CPT code’s Medicare payment is calculated from three Relative Value Unit components: physician work, practice expense, and malpractice. Together they multiply by the conversion factor to produce the payment amount.
Payment = Total RVU × Conversion Factor ($33.4009) × Geographic Adjustment (GPCI). National averages shown. Actual payment varies by locality.
Medicare Payment by State
Medicare adjusts payment by locality based on GPCI (Geographic Practice Cost Index). Higher cost-of-living areas like California and New York pay more. Rural states pay less. Top 12 states shown.
Showing top 12 of 53 states. Full locality data available in CMS PFS Locality file.
NCCI Bundling Edits
10 pairsThese codes trigger National Correct Coding Initiative edits when billed with 99204. An indicator of 0 means the pair cannot be unbundled. Indicator 1 means modifier 59 or X-modifiers may allow separate billing with supporting documentation.
Billing 99204 alongside a bundled code without the correct modifier generates CARC 97 denials. Payers often flag these as audit risks. Document medical necessity for the separate service and apply modifier 59 or the appropriate X-modifier (XE, XS, XP, XU) only when clinically justified.
Misuse of Column Two code with Column One code
Misuse of Column Two code with Column One code
Misuse of Column Two code with Column One code
CPT Manual or CMS manual coding instruction
CPT Manual or CMS manual coding instruction
Misuse of Column Two code with Column One code
CPT Manual or CMS manual coding instruction
Standards of medical/surgical practice
More extensive procedure
More extensive procedure
E/M-with-procedure CO-97 denials are usually a modifier 25 documentation problem, not a bundling truth. Distinct chief complaint, distinct HPI, distinct A/P sections in the chart make the modifier 25 defensible. We audit every E/M line billed with a same-day procedure before submission.
Applicable Modifiers
Modifiers commonly paired with 99204 based on its category. Apply only when the clinical circumstance warrants. Incorrect modifier use is a top audit target.
Modifier 25 on E/M plus same-day procedure is the most-audited modifier in physician billing. UnitedHealthcare, Anthem, and several BCBS plans run automated post-pay review on these claims. We audit every modifier 25 application against the chart before submission.
Supporting ICD-10 Diagnoses
These diagnosis codes commonly support medical necessity for CPT 99204. Using the correct ICD-10 prevents CARC 50 denials. Payer rejects when the diagnosis doesn’t support the procedure.
E/M CO-50 denials are typically about diagnosis-procedure linkage. Stale or generic ICD-10 codes attached to 99204 fail medical-necessity review. We verify diagnosis specificity at the coding stage.
Find the revenue leakage in your 99204 claims.
Wrong modifier, missing documentation, bundling without justification, stale ICD-10 linkage: these are the silent revenue killers on E/M claims. Our AAPC-certified team audits your last 90 days of 99204 claims, surfaces the recoverable dollars, and appeals them. Free, no obligation.
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Related CPT Codes
Codes in the same family as 99204
Specialty billing guides
CPT 99204 is among the top codes profiled in these specialty billing guides.
Everything about CPT 99204
What does CPT code 99204 cover?
CPT 99204 covers new patient visits with moderate-complexity medical decision making OR 45-59 minutes of total time. Requires two or more chronic conditions, acute illness with systemic symptoms, or an undiagnosed problem with uncertain prognosis. Common examples include: New patient with diabetes and hypertension, comprehensive workup for chronic symptoms.
What is the Medicare payment for CPT 99204?
The national average Medicare payment for CPT 99204 is approximately $177.36 in a non-facility setting and $116.9 in a facility setting. Actual payment varies by locality based on GPCI adjustments. Total RVU is 5.31 with a conversion factor of $33.4009.
What is the global period for CPT 99204?
CPT 99204 has no global period (indicator XXX). Because it's an E/M code, there are no post-operative day restrictions. You can bill 99204 on the same day as a procedure with modifier 25 (significant, separately identifiable E/M), or during another code's post-op period with modifier 24 (unrelated E/M during global period).
What codes bundle with CPT 99204?
CPT 99204 has NCCI Procedure-to-Procedure edits with 10+ codes including 0362T, 0373T, 0469T. Modifier indicator 0 means the edit cannot be bypassed. Indicator 1 means modifier 59 or X-modifiers may allow separate billing with documentation.
CPT codes and descriptions are copyright of the American Medical Association. RVU values reflect current CMS publications. Actual payment varies by locality. Commercial payer rates vary by contract.
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