Dermatology billing, handled with care
Where dermatology billing gets difficult
The issues we see most often, and the ones that quietly cost practices the most.
Same-day visits and procedures
An E/M visit on the same day as a minor procedure needs a separately documented reason, or payers may deny or bundle it.
Size and pathology dependencies
Excision codes depend on lesion size with margins and on whether pathology shows a benign or malignant lesion.
Multiple lesions in one visit
Several biopsies, destructions or excisions in different sites require careful sequencing and modifier use.
Cosmetic versus medical services
Patients need clear expectations when a service may be considered cosmetic and not covered by insurance.
How we handle them
Hold for pathology when needed
Excisions are coded once the pathology report confirms the diagnosis, so the claim reflects the final result rather than an assumption.
Measurement-based coding
We code from documented lesion size and margins, and flag notes where a measurement is missing.
Modifier review
Multi-lesion and same-day visits are reviewed for appropriate use of modifiers 25, 59 or X-modifiers based on the documentation.
Clear patient financial communication
We help your team set up consistent estimates and waivers for services that may be cosmetic or have limited coverage.
Coding notes
General guidance only. Code sets update every year and payer policies vary, so we check current rules on every claim.
- Modifier 25 with E/M
- When an evaluation goes meaningfully beyond the usual pre-procedure assessment, modifier 25 may be appended to the E/M. The note should make the separate work easy to see.
- Excision sizing
- Benign (11400–11446) and malignant (11600–11646) excision codes are chosen by the lesion’s greatest clinical diameter plus the narrowest margins required, measured before excision.
- Biopsy codes
- Skin biopsies are coded by technique: tangential (11102–11103), punch (11104–11105) or incisional (11106–11107), with add-on codes for each additional lesion.
- Mohs surgery
- Mohs codes (17311–17315) are based on anatomic site and the number of stages and tissue blocks. They apply only when the same physician acts as both surgeon and pathologist.
Dermatology billing questions
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