CPT Code 11406: Benign lesion excision billing guide (2026)

Key Takeaways

CPT Code 11406 describes excision of a benign skin lesion including margins, except skin tag, on the trunk, arms, or legs where the excised diameter exceeds 4.0 cm.

Excised diameter must include the lesion plus surgical margins on all sides – measuring the lesion alone is the most common coding error for CPT 11406.

The 2026 Medicare non-facility reimbursement for CPT 11406 is approximately $190-$230; rates vary by geographic location and payer contract.

Pabau’s claims management software supports accurate CPT 11406 billing with configurable fee schedules, integrated documentation templates, and claim submission workflows.

Benign lesion excision claims are among the most frequently denied dermatology and primary care claims, and the reason is almost always the same: incorrect measurement of the excised diameter. CPT Code 11406 sits at the top of the trunk/arms/legs benign lesion code series, reserved for the largest excisions, and coders who misapply it risk both underpayment and audit exposure.

This reference guide covers the official descriptor, 2026 fee schedule, modifier rules, ICD-10 pairings, documentation requirements, and the most common billing mistakes coders make with this code. All reimbursement figures reference the CMS Medicare Physician Fee Schedule (MPFS) and should be verified against the current year’s published rates, as Medicare adjusts fee schedule values annually.

CPT Code 11406: definition and clinical description

CPT Code 11406 is defined by the American Medical Association (AMA) as the excision of a benign lesion including margins, except skin tag, when the procedure is performed on the trunk, arms, or legs and the excised diameter exceeds 4.0 cm.

This code lives in the Integumentary System section of the CPT manual (Surgery, codes 10000-19999). It applies to surgical excision only, not destruction, laser ablation, or shave removal. Skin tags are explicitly excluded from the descriptor and are coded separately using CPT 11200 or 11201, depending on the number of lesions removed.

CPT 11406 in the benign lesion excision code family (11400-11446)

The 11400-11446 code series covers benign lesion excision across all body sites, with the code selected based on two variables: anatomical location and excised diameter. CPT 11406 is the highest code in the trunk/arms/legs series (11400-11406), meaning it represents the largest lesions in that anatomical group. Using skin clinic software that maps these code families helps prevent up- and downcoding errors when multiple lesions are removed at the same visit.

Note that CPT 11404 (3.1-4.0 cm) is the code immediately below 11406 in this series. A lesion measured at exactly 4.0 cm including margins falls under 11404; only measurements strictly greater than 4.0 cm trigger 11406. This distinction matters for coders using the same code-family logic applied across other CPT series.

How to measure excised diameter correctly

The single most common coding error with CPT 11406 is measuring only the visible lesion, not the excised specimen including its surgical margins. The AMA and AAPC coding guidelines are unambiguous: excised diameter equals the lesion plus the margin of normal tissue taken on all sides.

The measurement formula: Excised diameter = widest dimension of lesion + (margin on each side x 2)

For example: a 3.0 cm lesion excised with 0.6 cm margins yields an excised diameter of 4.2 cm, placing it in the 11406 range. That same lesion excised with only 0.4 cm margins yields 3.8 cm, which falls under 11404. The margin is clinical, not cosmetic: it is determined by the surgeon based on the lesion’s characteristics, and it must be documented in the operative note.

• Measure the excised specimen before placing it in formalin (formalin fixation causes tissue shrinkage)
• Use the widest dimension of the entire excised specimen, including margins on both sides
• Record the measurement in the operative note in centimeters
• If the wound is oval or elliptical, use the longest axis of the excised specimen

CPT Code 11406 fee schedule and reimbursement rates (2026)

Medicare reimbursement for CPT Code 11406 is set annually through the Medicare Physician Fee Schedule (MPFS). Rates below reflect approximate 2026 national non-facility values; actual payment depends on geographic location via the Geographic Practice Cost Index (GPCI). Private payer rates are negotiated separately and may differ substantially. Use the FastRVU 2026 RVU lookup tool to calculate location-adjusted reimbursement for your ZIP code.

All RVU figures are approximate and based on 2026 MPFS data. The facility rate is lower because CMS pays the facility separately for overhead costs. Verify current values using the official CMS MPFS lookup before submitting claims or setting fee schedules.

Facility vs. non-facility rates for CPT 11406

When CPT 11406 is performed in an office or non-facility setting, the physician receives a higher total reimbursement because the practice expense component covers supplies, equipment, and overhead. When performed in a hospital outpatient department or ambulatory surgery center (ASC), the facility bills separately for those costs, so the physician’s reimbursement is lower. This distinction affects how practices structure their service settings for dermatological procedures and is a factor worth building into your dermatology EMR software fee schedule configuration.

Modifiers for CPT Code 11406

Modifiers clarify the circumstances of a procedure and prevent inappropriate bundling. For CPT Code 11406, the following modifiers are most commonly applied. Modifier 59 should only be used when no more specific X-modifier (XE, XS, XP, XU) is appropriate, per CMS guidance.

Practices using claims management software can configure modifier rules at the code level, reducing manual errors when multiple lesion excisions are billed on a single date of service.

ICD-10 diagnosis codes that pair with CPT 11406

The ICD-10-CM diagnosis code submitted with CPT 11406 must support medical necessity. Coders should verify pairings against current AHA Coding Clinic guidance, as the examples below are illustrative rather than exhaustive. For coding reference articles covering a wider range of ICD-10 code applications, refer to Pabau’s diagnostic code library.

Laterality matters: use the most specific ICD-10 code available (right arm, left leg, etc.) rather than unspecified codes. Unspecified codes can trigger medical necessity reviews and slow payment. For context on how ICD-10 code specificity affects claim outcomes across different code families, specificity is consistently one of the top audit flags in CMS claim data.

Documentation requirements for CPT Code 11406

Medicare Administrative Contractors (MACs) review CPT 11406 claims against Local Coverage Determinations (LCDs), including LCD A57113. The operative note and supporting clinical record must substantiate medical necessity and code selection. Practices using digital forms and structured clinical documentation can pre-populate these fields into each encounter note, reducing documentation gaps at audit.

• Lesion description: location (specific body site), morphology, size of the lesion itself, and clinical indication for removal
• Medical necessity: clinical reason for excision (e.g., symptomatic, changing morphology, suspicious features, functional impairment)
• Excised diameter: the measured dimension of the specimen including margins, documented in centimeters
• Surgical technique: type of excision (elliptical, punch, shave) and depth of excision
• Margin documentation: planned margin width and the final measured margin
• Wound closure: whether repair was simple, intermediate, or complex (affects whether a separate repair code applies)
• Pathology submission: documentation that the specimen was sent for histological examination

Pathology and specimen submission

CPT 88305 (Level IV surgical pathology) is separately billable under Medicare for histological examination of the excised specimen and is not bundled with CPT 11406. However, individual payer policies vary – some managed care contracts bundle pathology into the surgical fee, so coders should verify with each payer before billing CPT 88305 separately. Submitting the pathology specimen also strengthens the medical necessity record by providing histological confirmation of the benign diagnosis, which is valuable documentation in the event of a post-payment audit.

Streamline your dermatology billing with Pabau

Pabau's claims management tools support accurate CPT code submission with configurable fee schedules, built-in documentation templates, and automated claim workflows. See how practices reduce claim denials and billing errors.

Book a demo

Global surgical package and post-op billing

CPT 11406 carries a 10-day global surgical period. Under CMS’s global surgery policy, routine post-operative care related to the excision is included in the 11406 reimbursement for 10 days following the procedure date. Billing separately for those services triggers claim denial.

Services typically included in the global package: wound checks, suture removal, routine dressing changes, and uncomplicated follow-up visits directly related to the excision. Services outside the global period or for unrelated conditions may be billed separately with appropriate documentation. When billing a same-day E/M service with the excision, append Modifier 25 to the E/M code to indicate it addresses a separately identifiable problem. For practices managing HIPAA compliance requirements alongside billing workflows, keeping a clear audit trail of post-op visit documentation prevents improper billing exposure.

Common coding errors and how to avoid them

These are the most frequent billing mistakes for CPT 11406 flagged in payer audits and NCCI edit reviews. Practices that review these patterns during coding audits catch most of them before claims submission. The IVF and other procedure code billing guides in Pabau’s reference library use the same structured error-review format.

How Pabau supports accurate billing for CPT Code 11406

Coding errors on benign lesion excision claims usually start in documentation, not in the billing software. Pabau’s claims management workflow addresses this at the source: clinicians document excised diameter, margin measurements, and medical necessity within structured clinical note templates, which feed directly into the billing workflow.

Fee schedules in Pabau are configurable by code and payer, so CPT 11406 can be mapped to the correct reimbursement rate for each insurance contract. The practice management platform also supports modifier rules at the service level, which helps prevent missing or incorrect modifiers when the same patient has multiple lesions removed in one visit. Practices using Pabau’s coding tools alongside their existing EHR can cross-reference documentation before claim submission, reducing the documentation-to-claim gap that drives most denials.

Conclusion

CPT Code 11406 is straightforward in concept but generates a disproportionate share of denials because the measurement rule is easy to apply incorrectly. Excised diameter always includes margins, the body site must be trunk, arms, or legs, and skin tags are always excluded. Those three rules, consistently applied, eliminate the majority of claim errors in this code series.

Pabau’s claims management software connects clinical documentation to code submission so measurement data, medical necessity language, and modifier flags travel together from note to claim. To see how the workflow applies to your practice, book a demo.

Continue your research

Need a coding reference for other CPT procedure codes? Coaching CPT codes covers the billing rules for health and wellness coaching services under Medicare and commercial payers.

Managing billing for a dermatology or skin clinic? Pabau’s skin clinic software is built for practices performing excision, laser, and aesthetic procedures with integrated billing and clinical documentation.

Looking for ICD-10 coding context alongside your CPT billing? ICD-10 coding reference guides on the Pabau blog walk through diagnosis code selection, documentation, and medical necessity standards across clinical specialties.

Frequently Asked Questions