Specialty billing
Dermatology Medical Billing Services
Dermatology billing turns on two distinctions payers scrutinize heavily: medical versus cosmetic intent, and lesion counts and measurements that determine code selection. Because dermatology is high-volume with relatively low per-claim value, small systematic coding errors compound into substantial revenue loss quickly.
Dermatology benchmarks
- Typical denial rate
- 9–14%
- Days in AR
- 30–42
- Achievable clean claim rate
- 97%+
Typical ranges for dermatology practices. Your actual numbers are measured during the audit.
The complexity
Why dermatology is uniquely difficult to bill
Medical versus cosmetic determination drives whether a service is payable at all
Biopsy codes are selected by technique and counted by lesion, not by encounter
Excision codes depend on lesion diameter plus margins, measured before removal
Mohs surgery bills by stage and block count with strict documentation requirements
Destruction codes differ for benign, premalignant and malignant lesions
Pathology may be billed globally or split depending on where the specimen is read
Coding
Dermatology procedure codes we work with daily
A representative sample, not an exhaustive list. Coders are assigned by specialty rather than pooled.
| Code | Description |
|---|---|
| 11102 | Tangential biopsy of skin, single lesion |
| 11104 | Punch biopsy of skin, single lesion |
| 17000 | Destruction of premalignant lesion, first lesion |
| 11602 | Excision of malignant lesion, trunk/arm/leg, 1.1–2.0 cm |
| 17311 | Mohs micrographic surgery, first stage, up to 5 blocks |
| 88305 | Surgical pathology, gross and microscopic examination |
Revenue leakage
Where dermatology practices lose money
These are the denial patterns specific to this specialty — the ones a general-purpose billing service will not be looking for.
Cosmetic determination
Procedures denied as cosmetic where documentation does not establish functional impairment or medical necessity.
Lesion measurement missing
Excision codes denied or downcoded because the note omits lesion diameter and margin width measured prior to removal.
Add-on code sequencing
Additional-lesion add-on codes billed without the primary code, or exceeding the units the primary supports.
Modifier 59 misuse
Distinct procedural service modifier applied to bypass NCCI edits without documentation supporting separate sites or sessions.
Mohs documentation gaps
Stage and block counts not documented per stage, causing denial of subsequent-stage codes.
Payer landscape
What dermatology practices need to know about payers
Payer policy drives more dermatology denials than coding does. Knowing the policy before the service is what prevents them.
- Payer policies on actinic keratosis destruction often cap the number of lesions reimbursed per session.
- Several commercial payers require photographic documentation for lesion removals near the line between medical and cosmetic.
- Pathology billing arrangements vary — confirm whether the reading dermatopathologist bills independently before submitting globally.
Questions
Dermatology billing FAQ
Last updated August 20, 2026
Reviewed by a certified coding leadOn documented medical necessity — symptoms, functional impairment, suspicion of malignancy, or failure of conservative treatment. The determination is made from your note, not from the procedure itself. The same lesion removal can be payable or denied depending entirely on what the documentation establishes.
Because excision codes are selected by lesion diameter plus the narrowest margin, measured before removal. If the note records only a post-excision specimen size, or omits margins entirely, payers downcode to the smallest tier. Measuring and documenting before you cut is worth real money per case.
By stage, with block counts documented per stage. The first stage and each subsequent stage carry separate codes, and blocks beyond the base count add on. Payers audit Mohs closely, so per-stage documentation of tissue blocks examined is essential to defend the claim.
Yes. The billing paths are entirely separate — cosmetic work is patient-pay and never submitted to insurance, while medical work follows standard claims processing. Keeping the two cleanly separated is itself an audit-protection measure.
Primary sources
Coverage, rates and local policy for dermatology, at the source.
- NCCI Policy Manual for Medicare Services (opens in a new tab)
Centers for Medicare & Medicaid Services — The reasoning behind the edits, chapter by chapter. Where the edit files tell you two codes conflict, this explains why — which is what an appeal has to address.
- Medicare Coverage Database (LCD/NCD) (opens in a new tab)
Centers for Medicare & Medicaid Services — Searchable national and local coverage determinations. The direct answer to whether a diagnosis supports medical necessity for a given procedure.
- Advance Beneficiary Notice of Noncoverage (ABN) (opens in a new tab)
Centers for Medicare & Medicaid Services — The form and the rules for issuing it. Whether a non-covered service can be billed to the patient usually turns on whether a valid ABN was obtained beforehand.
Reading
Dermatology billing, in depth
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