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Dermatology Billing Services

A single dermatology visit can include an evaluation, three biopsies by two different techniques, a destruction and a cosmetic request the patient will pay for personally. Each piece is coded differently, some depend on the pathology report, and the visit itself is only billable when it stands apart from the procedures.

  • Modifier 25 applied only when the visit is separately documented
  • Excisions coded after pathology, by lesion size plus margins
  • Cosmetic and medical services separated before the claim is built
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The coding decisions behind every skin procedure

Dermatology runs on choices between similar-sounding procedures. A lesion can be sampled by tangential, punch or incisional biopsy, destroyed, shaved or excised, and each has its own code family, counting rule and global period. Picking the wrong family, or counting lesions incorrectly, is the most common reason a dermatology claim is underpaid or denied.

Timing matters as well. Whether an excision is benign or malignant is decided by the pathology report, and the code depends on the excised diameter, which includes the lesion and the narrowest margins measured before excision. Claims sent before pathology returns are often coded wrongly and have to be corrected later.

The other dermatology-specific risk is the line between medical and cosmetic. Removing an irritated, bleeding or suspicious lesion is medical; removing a harmless one for appearance is not covered. Patients need to know before the procedure which kind it is, and the claim needs to reflect it.

Dermatology code families: biopsy, destruction, excision and Mohs

A working summary of the code families dermatology practices use most. Confirm against the current CPT code set and payer policy.

Dermatology procedure code families and billing notes
CodesProcedureBilling notes
11102 to 11107Skin biopsy: tangential (11102, 11103), punch (11104, 11105) and incisional (11106, 11107).Only one primary biopsy code is reported per session; additional biopsies use the add-on code of their own technique.
17000, 17003, 17004Destruction of premalignant lesions such as actinic keratoses.17000 is the first lesion, 17003 each of lesions 2 to 14, and 17004 is used alone for 15 or more lesions.
17110, 17111Destruction of benign lesions such as warts; skin tags and vascular lesions use other codes.17110 covers up to 14 lesions and 17111 covers 15 or more.
11400 to 11646Excision of benign (114xx) and malignant (116xx) lesions, by site and excised diameter.Simple repair is included; intermediate and complex repairs may be reported separately, except with benign excisions of 0.5 cm or less, which include all repairs.
17311 to 17315Mohs micrographic surgery, where the same physician acts as surgeon and pathologist, by anatomic area and stage.Head, neck, hands, feet and genitalia use 17311 and 17312; trunk and extremities use 17313 and 17314; 17315 counts additional tissue blocks beyond five.
Modifier 25 with minor proceduresA significant, separately identifiable evaluation on the same day as a minor procedure.The decision to perform a minor procedure is included in the procedure itself, so 25 needs documentation of separate work.
GA, GX, GY, GZMedicare liability modifiers for services that may not be covered or are statutorily excluded.Cosmetic services are excluded by statute; GY marks them, and an ABN is not required for them, though a voluntary notice can be given with GX.

CPT is a registered trademark of the American Medical Association.

Official sources: CMS Medicare Coverage Database: LCD L35498 (lesion removal) (external site), CMS Medicare Coverage Database: article A54602 (lesion destruction) (external site), CMS Medicare Coverage Database: article A53883 (Mohs surgery) (external site), CMS NCCI Policy Manual, chapter 3 (integumentary) (external site), CMS NCCI Policy Manual, chapter 1 (minor procedures) (external site), CMS Claims Processing Manual, chapter 30 (ABNs) (external site), CMS: coverage database article export (external site), CMS MLN: advance written notices (external site)

Dermatology denials we see repeatedly

  • Modifier 25 on every visit

    Payers audit practices that append 25 routinely, and deny visits whose notes only describe the procedure.

  • Excisions coded before pathology

    A benign code billed for a lesion that turned out malignant, or the reverse, leads to underpayment or a correction.

  • Lesion size measured without margins

    Coding from the lesion alone instead of the excised diameter puts the claim in a smaller, lower-paying size range.

  • Two primary biopsy codes

    Billing a primary code for each technique in the same session instead of one primary plus add-ons.

  • Cosmetic services billed as medical

    Without documented symptoms or suspicion, payers treat lesion removal as cosmetic and deny.

  • Biologics without approved authorization

    Biologic approvals follow each plan's criteria and lapse on the plan's renewal schedule unless a renewal is filed in time.

How our team works dermatology claims

  1. Step 1: Hold procedure claims for pathology

    Excision and biopsy claims wait for the pathology report so benign or malignant codes are chosen once, correctly.

  2. Step 2: Review 25 against the note

    Same-day visits are checked for a separately documented problem before the modifier is added.

  3. Step 3: Count lesions by family

    Biopsies, destructions and excisions are counted under each family's own rules, with units and add-ons matched.

  4. Step 4: Flag cosmetic requests early

    Cosmetic services are identified at scheduling so the patient gets a price and pays at the visit.

Biologic and specialty drug authorizations

Biologics for psoriasis, atopic dermatitis and hidradenitis are usually covered under the pharmacy benefit and dispensed by a specialty pharmacy, yet the authorization work falls on the practice. Each plan sets its own approval criteria and renewal period, so every request is built from the plan's current policy for that drug.

We track each patient's approval dates, prepare renewals before they lapse, and keep the clinical details payers ask for in one place, so treatment is not interrupted by paperwork. Pharmacy-benefit authorizations can be included in your engagement.

Frequently asked questions

When is modifier 25 appropriate on a skin procedure day?

When the provider evaluates a separate problem, or does significant work beyond the usual assessment that leads to the procedure, and documents it. If the visit only decided to perform the biopsy or destruction, it is included in the procedure.

Should we wait for pathology before billing an excision?

Yes. Benign and malignant excisions use different codes and payment, and the pathology report decides which applies. Holding the claim briefly avoids correcting it later.

How do we code a punch biopsy and a shave biopsy in the same visit?

Only one primary biopsy code is reported for the session, generally the highest-valued technique, and the other biopsies are reported with the add-on code for their own technique.

A patient wants a benign mole removed for appearance. How do we bill it?

As a cosmetic, self-pay service with a price agreed before the procedure. For Medicare patients the service is statutorily excluded; the GY modifier applies if a claim is needed for a secondary payer.

Who handles biologic prior authorizations?

Usually the prescribing practice, even though a specialty pharmacy dispenses the drug. Renewals need updated clinical information, so they are best tracked on a calendar rather than handled as they expire.

Related services and specialties

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Find the gaps in your dermatology coding

A free audit reviews modifier 25 use, biopsy and excision coding, and the denials your dermatology claims receive most.

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