What makes dermatology billing services different
Dermatology billing services deal with a line most specialties never cross: the boundary between medically necessary skin care and cosmetic work. A payer covers a lesion destroyed because it is premalignant, not the same-looking lesion removed for appearance. On top of that come Mohs stages billed by the block, biopsies coded by technique, pathology that may be read in-house or sent out, and modifier combinations that decide whether procedures on the same day are paid or bundled. Fastora's certified billing and coding professionals handle these claims for dermatology practices as part of our wider medical billing services.
Many dermatology practices mix medical visits, surgical days and cosmetic services in one schedule. Claims for the cosmetic side of the practice must stay out of the insurance billing entirely, while the medical side needs documentation that proves medical necessity every time.
Medical necessity and the cosmetic exclusion
Most payer policies cover lesion destruction, excision and related procedures only when the note shows a covered diagnosis and the clinical reason treatment was needed. For benign lesions the note should show symptoms, irritation, bleeding, change in appearance or failed conservative care — not simply patient request.
Photographs, measured sizes and prior treatment history are the evidence that survives a medical-necessity review. We check that the elements your payers' policies require are in the record before the claim goes out, rather than assembling them after a denial.
Eligibility, benefits and prior authorization
We run eligibility and benefits checks before visits and procedures, confirming whether the plan excludes cosmetic-adjacent procedures and whether a referral is required. Biologics, phototherapy and some surgical procedures may need prior authorization, and the approval should list the codes and the body site so the claim matches it.
Specialty pharmacy drugs for psoriasis and atopic dermatitis are a common authorization trap: the prescription, the benefit type and the site of administration all have to agree, or the drug claim and the administration claim deny for different reasons.
Dermatology coding: key codes and modifiers
| Code | Descriptor (summary) | Billing note |
|---|---|---|
| 17000 | Destruction of premalignant lesion, first lesion | Size and destruction method in the note |
| 17003 | Destruction of premalignant lesions, 2 through 14 | Count each lesion treated |
| 17004 | Destruction of premalignant lesions, 15 or more | Single unit per date |
| 11102 | Tangential biopsy of skin, single lesion | Add-on 11103 for each additional lesion |
| 11104 | Punch biopsy of skin, single lesion | Add-on 11105 for each additional lesion |
| 17311 | Mohs surgery, head/neck/hands/feet/genitalia, first stage | Stage count from the operative note |
| 17312 | Mohs surgery, same areas, each additional stage | One unit per stage |
| 17313 | Mohs surgery, trunk/arms/legs, first stage | Add-on 17314 for additional stages |
| 11900 | Intralesional injection, up to 7 lesions | 11901 for more than 7 lesions |
Benign and malignant destruction use different code families, and shave removals, excisions and destructions each have their own size-based rules. When a biopsy and a destruction happen at the same lesion on the same day, only one is typically billable — the note has to make clear what was done and why. Our medical coding team reviews dermatology claims against the operative and procedure notes before submission.
Modifiers 59 or the X modifiers apply when separate lesions or sites justify unbundling, and only where the note documents distinct sites. Modifier 25 on an office visit with a same-day procedure needs a separately documented problem beyond the decision to perform the procedure.
Mohs surgery billing
Mohs is billed by stage, and blocks beyond the included count use add-on codes. The repair or reconstruction that follows is coded separately from the repair code families, chosen by type and size. The operative note must show each stage, the number of blocks examined and the final defect size so the repair code matches.
Pathology interpretation during Mohs is part of the Mohs service when the surgeon reads the slides. Practices that send permanent sections to an outside lab need to keep the ordering, the lab's billing and the CLIA status straight so nothing is billed twice.
Common dermatology billing denials and how we prevent them
| Denial | Typical cause | Prevention step |
|---|---|---|
| Cosmetic exclusion | No covered diagnosis or medical-necessity documentation | Diagnosis, symptoms and prior treatment checked before submission |
| Mohs stage mismatch | Stage or block count on the claim differs from the operative note | Stages reconciled to the note at charge entry |
| Bundled biopsy | Biopsy and destruction at the same lesion billed together | Same-lesion services combined per coding rules |
| Missing modifier | Two procedures at different sites without a distinct-service modifier | Site documentation reconciled to modifiers |
| E/M denied with procedure | No separately documented problem for modifier 25 | E/M note reviewed before the visit code is added |
Every claim passes our Advanced Pre-Submission Claim Review before submission. Denials that still occur are worked by our denial management team, which corrects and resubmits or appeals with the record, and open balances are followed up by payer and age.
Credentialing for dermatologists
Dermatologists, Mohs surgeons and physician assistants each need enrollment with the plans they bill, and new associates need to be linked to the group before their claims pay in network. Practices that read their own pathology need the lab enrollment and CLIA certificate current.
Our credentialing and enrollment service tracks each file through a nine-stage process, from document collection and NPI and CAQH setup to payer applications, follow-ups and final approval.
How Fastora supports dermatology billing
Fastora works inside your existing EHR/PM system under the user access you grant, with no software to install and no hidden setup fees. You get a dedicated account contact, transparent dashboards, monthly performance reporting and a monthly review call.
Fees are quoted after a free assessment, and you can read how our pricing models work beforehand. To see how your current claims hold up, start with a free billing assessment.
Dermatology billing and coding services
As a dermatology billing company, we run dermatology medical billing for medical and cosmetic practices alike. Dermatology billing and coding covers lesion destruction and excision coding, biopsy and pathology coordination, Mohs surgery claim sequencing, and the cosmetic-vs-medical coverage line that decides whether a claim pays or bills the patient. Authorization checks run before procedures, not after, and cosmetic services get clear patient responsibility estimates up front. Related: medical coding services, eligibility verification, free medical billing audit.