Dermatology Billing Services for Medical, Surgical, and Cosmetic Practices

A single dermatology visit can include a skin exam, two biopsies, cryotherapy on actinic keratoses, and a cosmetic consult, all billed under different rules. Medix Revenue Group provides dermatology billing for medical, surgical, and cosmetic practices across the United States. We code same-day procedures correctly, capture Mohs stages and pathology, track biologics authorizations, and keep cosmetic cash-pay work off insurance claims.

Why dermatology billing is different

Dermatology is a high-volume specialty that behaves like a surgical one. Revenue leaks in four places:

Same-day procedures. An E/M visit plus a biopsy or destruction is routine, and modifier 25 and 59 on those claims draw payer scrutiny.
Measurement-based coding. Codes depend on lesion size with margins, the number of lesions, and the biopsy technique, and all of it has to be in the note.
Three revenue streams. Medical visits, surgical work including Mohs, and cosmetic cash-pay services follow different billing rules.
Biologics. Specialty drugs need prior authorization, step-therapy documentation, and renewal.
Ensuring proper use of modifiers for procedures performed during E/M visits

These nuances directly impact your revenue. Our workflows, checklists, and internal audits are built specifically around the realities of family practice billing.

Dermatology billing services we provide

Dermatology claims are won or lost on the details: lesion size, biopsy technique, same-day procedures and payer-specific edits. Medix manages the full revenue cycle for your practice, from verifying coverage before the visit to collecting the final balance. We bill each service line by its own rules, whether medical, surgical, Mohs, pathology or cosmetic.

Coding review, lesion by lesion

Certified coders check every claim against the procedure note, including lesion size, margins, number of lesions and biopsy technique. Each billed code is supported by the documentation.

Insurance eligibility verification

We confirm coverage, deductibles and referral requirements before the visit. That prevents front-end denials and surprise patient balances.

Prior authorization

We submit and track authorizations for procedures, biologics and specialty drugs, including step-therapy documentation and renewals. Patients start treatment on time and therapy isn’t interrupted at renewal.

Clean claim submission

Claims are checked against NCCI edits and scrubbed for modifier 25 and 59 issues before submission. More claims are paid on the first pass.

Denial management and appeals

We work every denial to its root cause and file appeals with supporting documentation. We also fix the upstream issue so it doesn’t repeat.

A/R follow-up

Unpaid and underpaid claims are chased by aging bucket until they are resolved. Your days in A/R stay low.

Payment posting

nsurance and patient payments are posted accurately and checked against contracted rates. Underpayments are flagged and your ledger matches your deposits.

Patient statements and balance follow-up

Statements are clear and timely, with cosmetic and medical balances kept separate. Patients aren’t confused about what insurance covers and what they owe.

Provider credentialing and payer enrollment

We handle applications, CAQH and payer enrollment so new providers can bill in-network without delays.

Monthly reporting

You get a monthly view of medical E/M, procedures, Mohs, pathology and cosmetic revenue. It shows where money is leaking and which service lines drive growth.

Dermatology billing codes and common coding pitfalls

Common Dermatology CPT Codes We Bill

CPT	Service	Watch-out
99202–99215	E/M visits	Add modifier 25 only when a significant, separately identifiable evaluation is documented apart from the procedure.
11102–11107	Skin biopsy by technique (tangential, punch, incisional)	Billed per lesion, with add-on codes for additional lesions. A lesion that is biopsied and then destroyed is bundled.
17000, 17003, 17004	Destruction of premalignant lesions (actinic keratoses)	17000 is the first lesion, 17003 covers each additional lesion through 14, and 17004 is for 15 or more.
17110, 17111	Destruction of benign lesions (warts, molluscum)	17110 covers up to 14 lesions and 17111 covers 15 or more; they are mutually exclusive. Skin tags are 11200 and 11201, not 17110. With 17000 on the same day, NCCI calls for modifier 59 or XS.
11400–11446, 11600–11646	Excision, benign and malignant	Size is the lesion diameter plus margins, measured before cutting. Measuring from the specimen or the pathology report under-bills.
12001–13160, 14000–14302	Repairs and flaps	Simple repair is included in the excision; intermediate and complex repairs and flaps are billed separately with layer and length documented.
17311–17315	Mohs micrographic surgery	Billed per stage and per tissue block. See the Mohs section below.
88304, 88305, 88331	Pathology and frozen section	The professional and technical split depends on who owns the lab and who reads the slide.
96900, 96910–96913	Phototherapy	Payers expect documented medical necessity and treatment details for each session.
96920–96922	Excimer laser for inflammatory skin disease	Billed by treatment area size in square centimeters.
95044	Patch testing	Billed per test applied, so units must match the record.
11900, 11901	Intralesional injection	Up to 7 lesions, or more than 7; the drug (for example triamcinolone, J3301) is billed separately.
11200, 11201	Skin tag removal	Often treated as cosmetic; document irritation, bleeding, or another medical reason.

Same-day biopsy, destruction, and Mohs: modifier 25 and 59 or XS

Payers apply NCCI edits to same-day dermatology services. A modifier only works when the note shows genuinely separate services, and modifier 25 on a same-day dermatology E/M is a common audit target.

Common Dermatology Coding Scenarios

Scenario	Typical Coding	Why
New rash is evaluated and a biopsy is taken at the same visit	E/M with modifier 25, plus the biopsy code	Separate evaluation of the rash, documented apart from the biopsy
Acne is managed and warts are destroyed at the same visit	E/M with modifier 25, plus 17110	Two distinct conditions, each documented
Biopsy of one lesion, destruction of a different lesion	Both codes, with 59 or XS on the second code of the NCCI edit pair	Different lesions or sites; payers differ on which code carries the modifier
Biopsy and destruction of the same lesion	Destruction only	The biopsy is bundled into the destruction
Diagnostic biopsy before Mohs on the same lesion	Biopsy with 59 (or 58), plus the Mohs codes	CPT allows the biopsy to be reported separately
Routine skin check with cryotherapy of actinic keratoses and no separate problem	Procedure only	A separate E/M needs separate work documented

Mohs surgery billing

Mohs is reported by stage and by tissue block, not as one procedure. 17311 is the first stage for the head, neck, hands, feet, and genitalia, and 17313 is the first stage for the trunk, arms, and legs. 17312 and 17314 are each additional stage, and 17315 is each additional block after the first five in a stage. Reconstruction is billed separately from the Mohs codes.

The errors we prevent:

Reconstructing the stage log after the case, which loses stages and blocks
Block counts that never reach the claim
Folding a same-day repair into the Mohs code
Mohs performed inside another procedure's global period without the right modifier and documentation

Biologics, specialty drugs, and prior authorization

Biologics for psoriasis, atopic dermatitis, and similar conditions (Dupixent and Cosentyx are common examples) carry more authorization work than any other dermatology service. We:

Check whether the drug falls under the medical or pharmacy benefit
Pull severity scores (such as BSA, PASI, or IGA) and prior treatment history into the request
Submit and track the authorization
Record the expiration date and start renewal before it lapses, since a lapsed authorization can deny every administration until it is renewed

Cosmetic and medical services: keeping them separate

Medicare excludes cosmetic surgery, and most commercial plans do the same, so cosmetic work is cash-pay by definition and never belongs on a claim. Two mistakes cost practices money, and both start at the front desk:

We help set the separation at scheduling, with separate consent and a separate financial policy, and a written same-visit rule for the case where a medical finding turns up during a cosmetic visit. Botox is a good example: cosmetic use is cash-pay, while a medical indication such as severe underarm sweating may be covered with prior authorization.

Common dermatology denials, and the fix

Common Dermatology Denials and Fixes

Denial	Usual Cause	Fix
Modifier 25 denied	One blended note; the E/M cannot be seen apart from the procedure	Separate evaluation and procedure sections, plus a pre-bill check on every modifier 25 line
Biopsy or destruction bundled	Same lesion, or no 59 or XS on different lesions	Record the site of each lesion and apply the NCCI modifier only to separate lesions
Excision under-coded	Size taken from the specimen instead of lesion plus margins	Record diameter and margins before cutting
Mohs stage or repair denied	Stages or blocks lost; repair merged into the Mohs code	Keep a stage log during the case and code repair separately
Biologic claim denied	Authorization missing or expired, severity not documented	Track expiration dates and document severity scores
Cosmetic versus medical dispute	Service placed on the wrong side of the line	Decide at scheduling and apply the same-visit rule
Pathology paid wrong	Professional and technical components mixed up	One rule per specimen path

Dermatology practices we support

We support dermatology practices of every size and type:

General medical dermatology
Surgical dermatology and Mohs surgery
Pediatric dermatology
Cosmetic and aesthetic practices
Dermatopathology labs
Multi-location dermatology groups

Our onboarding process for dermatology practices

1. Free billing review

We review recent claims and A/R for modifier 25 denials, under-coded excisions, aging claims, and lapsed authorizations.

2. Setup

Credentialing, payer enrollment, EHR and practice management access, and your cosmetic and medical service rules are loaded.

3. Go-live

Charges flow to us daily and claims are scrubbed against NCCI edits before submission.

4. Monthly reporting

Every month you get your collections, days in A/R and denial rate, so you can see how the practice is performing.

How much does dermatology billing cost?

Most billing companies charge a percentage of collections, and your rate depends on visit and procedure volume, Mohs and in-house pathology, the share of cosmetic work, and how much old A/R needs cleanup. Medix charges 3% to 8% of collections, with no long-term contracts and no hidden fees. You pay a percentage of what we collect for you, and you can leave with 30 days’ notice.

Why dermatology practices choose Medix Revenue Group

Coders who know dermatology

Our team works from the procedure note, lesion by lesion. We handle same-day E/M and procedure claims, modifier 25 and 59 decisions, Mohs staging and biopsy coding. Your claims reflect the work your providers actually did.

Medical, surgical and cosmetic billed by their own rules

We keep insurance claims and cash-pay cosmetic services separate, from the claim through to the patient statement. Your medical revenue and your cosmetic revenue stay clean and easy to read.

Fewer denials, caught early

Claims are checked against NCCI edits before they go out. When a denial comes back, we fix the cause as well as the claim.

Biologics and prior authorizations handled

We manage authorizations, step-therapy documentation and renewals, so patients start treatment on time and therapy isn’t interrupted.

Clear, simple pricing

You pay 3% to 8% of collections, with no long-term contracts and no hidden fees. You can leave with 30 days’ notice.

Reporting you can use

Each month you get your collections, days in A/R and denial rate, so you know how the practice is performing.

Find out where your dermatology revenue is leaking.

Dermatology billing FAQs

What do dermatology billing services include?

Coding review, eligibility and prior authorization, claim submission, denial management, A/R follow-up, payment posting, patient billing, credentialing, and monthly reporting by service line.

How much do dermatology billing services cost?

Most companies charge a percentage of collections. Your rate depends on volume, Mohs and in-house pathology, the share of cosmetic work, and A/R cleanup.

Does insurance cover dermatology?

Insurance generally covers medically necessary care, such as evaluation and treatment of skin cancer, psoriasis, eczema, acne, and infections. It excludes cosmetic services. What counts as cosmetic varies by plan, so we verify benefits and authorization before the visit.

How is Mohs surgery billed?

By stage and tissue block: 17311 or 17313 for the first stage, 17312 or 17314 for each additional stage, and 17315 for each additional block after the first five. Reconstruction is billed separately.

Do you handle credentialing for new dermatologists?

Yes. See our credentialing services.

When can modifier 25 be used on a dermatology visit?

When the record shows a significant, separately identifiable evaluation apart from the procedure done the same day. A single note that blends the visit and the procedure cannot support it.

Can a biopsy and a destruction be billed on the same day?

Yes, when they are on different lesions, usually with modifier 59 or XS. If the same lesion is biopsied and destroyed, only the destruction is billed.

How do you handle biologics prior authorizations?

We check the benefit, submit severity and treatment history, track approval and expiration dates, and start renewals before authorizations lapse.

Do you bill cosmetic services?

Cosmetic services are cash-pay and stay off insurance claims. We keep them separate from medical claims and can report cosmetic revenue on its own line.