CPT Code 11403 is used for excision of benign skin lesions measuring between 2.1 and 3.0 cm on trunk, arms, or legs, and includes the respective tissue margins. CPT 11403 has a 10 day global period.
Coding is dependent on the diameter that is excised rather than the original size of the lesion. Measure the diameter of the lesion and add twice the tissue margin that will be removed:
Diameter excised = lesion diameter + (2 × tissue margin)
The diameter of the lesion should be measured and recorded prior to excision as the dimensions of the specimen will change during the processing. Consequently, the pathology report may show a smaller measurement than what was excised. The operative report will be the determinant of the excision code in this case.
Different coding families are assigned for other anatomical locations. CPT codes 11420-11426 describe benign lesions on the scalp, neck, hands, feet, and genitalia; 11440-11446 describe lesions on the face and related structures; 11460-11466 describe malignant lesions.
The excision and closure of the lesion is included in this code. Intermediate or complex closures may also be reported, with sufficient supporting documentation.
This guide covers CPT 11403 code selection, documentation and medical necessity factors, modifiers, payment, billing errors and ways to combat underpayment.
How Is CPT 11403 Different From Similar Excision Codes?
Along with all other excision CPT codes, 11403 is split based on the size and body site.If either element is documented incorrectly, the claim may be denied.
CPT 11400–11406 Size Comparison (Trunk, Arms, Legs)
| CPT | Excised diameter | Body site | Global period |
| CPT Code 11400 | 0.5 cm or less | Trunk, arms, legs | 10 days |
| CPT Code 11401 | 0.6 to 1.0 cm | Trunk, arms, legs | 10 days |
| CPT Code 11402 | 1.1 to 2.0 cm | Trunk, arms, legs | 10 days |
| CPT Code 11403 | 2.1 to 3.0 cm | Trunk, arms, legs | 10 days |
| CPT Code 11404 | 3.1 to 4.0 cm | Trunk, arms, legs | 10 days |
| CPT Code 11406 | Over 4.0 cm | Trunk, arms, legs | 10 days |
Note: with this series, there is no 11405. There is a jump from 11404 to 11406.
What Documentation Supports Medical Necessity for CPT 11403?
Removal of benign lesions by Medicare is only justified if the lesion poses a risk to health or function. MAC policies such as L34938, L35498, and L33445 treat cosmetic procedures as statutory exclusions.
Required Operative Report Elements
The operative report should document six key elements: the body site, lesion size, margin width, full-thickness excision, closure method, and reason for removal.
The reason for removal is particularly important for demonstrating medical necessity.. MAC policies define such findings as bleeding, severe itching, pain, inflammation, infection, recent change in appearance, blocked orifice, and restricted eye function. You must state the finding in clear, concise clinical terms. The statement ‘Patient dislikes the look of it’ does not support medical necessity.
ICD-10 Codes That Support Medical Necessity
The diagnosis code you choose depends on the type of lesion and the reason for its removal. Some codes include, but are not limited to, D17.- for lipoma, D22.- for mole, D23.- for other benign skin growths, D48.5 for uncertain behavior, and L72.- for cyst.
You may also need to report the appropriate symptom code. Each MAC posts its own covered diagnosis list in a billing and coding article tied to the LCD. Check that list first, since covered codes vary by contractor.
Role of Pathology Confirmation (CPT 88305)
Pathology is coded and billed as Level IV surgical pathology, code 88305. This is usually done by the Lab unless the practice owns the Lab. Pathology results can affect code selection. If the report confirms malignancy, excision is coded in the 11600 series. In the case of uncertain behavior, CPT indicates code in the benign series. Hold the claim until the report is done.
Does CPT 11403 Need a Modifier?
CPT 11403 does not require a modifier on its own. The use of a modifier depends on the other services rendered on the same date. Modifier 22 refers to the work effort by the provider, and Modifier 25 is for an E/M code and is never for CPT 11403. Multiple procedures or services are covered by Modifier 51, while Modifier 59, or an X Modifier, is for a different, distinct service.
Using Modifiers 22, 25, 51, and 59 with CPT Code 11403
Modifier 25 is appended to the E/M code for a new problem that the visit resolved.According to the advance release of the 2026 CMS NCCI Policy Manual, a minor surgical procedure will already be considered a reimbursement for the procedure, and a new patient will not warrant a separate E/M. The manual also indicates the two services will not be considered separate if different diagnoses are documented.
Append XS or 59 when two lesions are removed from distinct sites on the same day, when supported by payer guidelines. Bill each separately with either LT or RT, as appropriate, and append 51 if the payer requires it. Append 22 infrequently, if at all, with an operative note outlining the extra work.
Example. The patient’s complaint is lipoma on the right forearm. The patient also has uncontrolled hypertension, which the provider evaluates and manages during the visit. The excised lesion measures 2.6 cm. The correct billing would be for 11403 and the lipoma code and 99213-25 for the blood pressure.
Reimbursement Rate Of CPT Code 11403 in 2026
The reimbursement for CPT code 11403 can vary greatly between different medical practices based on several factors, including the practice setting, geographic location, and payer mix Proper documentation and accurate RVU reporting are important for correct reimbursement
Medicare National Payment Rates (2026)
Standard Medicare (Non-QPP):
- Conversion Factor: $33.4009
- Non-Facility Payment (Office / Outpatient Clinic): $199.74
- Facility Payment (ASC / Hospital): $135.61
- Non-Facility Limiting Charge: $218.21
- Facility Limiting Charge: $148.15
Medicare QPP Rate (Qualifying APM Participant):
- Conversion Factor: $33.5675
- Non-Facility Payment (Office / Outpatient Clinic): $200.73
- Facility Payment (ASC / Hospital): $136.28
- Non-Facility Limiting Charge: $219.30
- Facility Limiting Charge: $148.89
Relative Value Units (RVU Breakdown):
- Work RVU: 1.79 | Malpractice (MP) RVU: 0.25
- Non-Facility Practice Expense (PE) RVU: 3.94 (Total Non-Facility RVU: 5.98)
- Facility Practice Expense (PE) RVU: 2.02 (Total Facility RVU: 4.06)
Commercial Payer Average Allowable Rates (2026)
- Blue Cross Blue Shield (BCBS): $210.11
- UnitedHealthcare (UHC): $242.67
- Cigna: $243.96
- Aetna: $255.40
- Commercial National Average: $238.03
Commercial and Medicare reimbursement rates vary based on location (GPCI), place of service (facility vs. non-facility), participation in provider networks, patient specific plan benefits, and the individual commercial payer fee schedules.
What Are the Most Common CPT 11403 Billing Errors?
Four errors commonly lead to CPT 11403 denials and underpayments.
- Coding Issues of 11403: Selecting the code based on size alone can result in undercoding (i.e. a lower code is assigned).
- Incorrect Body-Site Coding: The 11400 series of codes only covers the trunk, arms, and legs.
- Missed Modifier 25 for Same-Day E/M: A modifier 25 is required when an E/M service is coded with 11403 and is also a same-day service. Don’t add the modifier and not document. Documentation has to be done in order to avoid an audit.
- Missing Pathology Documentation: Documentation should be reviewed if it does not link pathology to a diagnosis code. Documentation has to be retained and diagnosis has to be documented as well.
How Do You Avoid Underpayment for CPT 11403?
Systematic underpayment of CPT 11403 occurs repeatedly until it is measured and addressed.
- Claims Audits Against the Fee Schedule: Review 90 days of claims where CPT 11403 was paid. Review the allowable amount for each claim. Determine the appropriate fee schedule rate based on the payer, location, and place of service. The largest gaps in amounts are likely to have the same reason.
- Benchmark Payer Contracts Against Medicare Rates: Benchmark contracted payer rates against Medicare reimbursement. Older contracts may use outdated conversion factors and result in low reimbursement. Use these findings during contract negotiations.
- Documentation Checklist Prior to Submission: Give your medical coders a simple checklist covering site, size, margin width, closure, and reason for excision. Match to the MAC list. Ensure Modifier 25 is used for same-day services.
Final Thoughts
Successful CPT 11403 billing depends on accurate coding supported by thorough documentation. Ensure the operative report includes the excised diameter, body site, medical necessity, and any separately reportable services. Review submitted claims periodically to identify coding errors, missed modifiers, and payer underpayments before they lead to recurring revenue loss.
