Accurate Dermatology Billing Services for Skin Care Practices
Dermatology billing covers an unusually broad range of service types — from routine skin checks and biopsies to Mohs surgery, phototherapy, biologics infusions, and cosmetic procedures that must be carefully separated from medical services. Each category has its own CPT code logic, size-based rules, and prior authorization requirements. Theiatrics handles every piece of it so your practice gets paid accurately and completely.
Dermatology Services Theiatrics Bills For
- Skin biopsies (tangential, punch, and incisional techniques)
- Benign lesion removal and destruction
- Malignant lesion excision with correct size coding
- Mohs micrographic surgery staging billing
- Actinic keratosis destruction (17000 series)
- Skin tag removal (11200, 11201)
- Wart and verruca destruction
- Phototherapy (UVB, PUVA, narrowband)
- Patch testing and allergen billing
- Dermatology biologics (J-code billing with authorization)
- Intralesional and subcutaneous injections
- Cosmetic versus medical service separation and patient billing
⚠️ Cosmetic vs. Medical Billing Distinction
Dermatology practices must carefully separate cosmetic services from medically necessary services. Billing a cosmetic procedure to insurance without documented medical necessity is a compliance violation. Equally, failing to identify and bill for procedures with legitimate medical indications leaves recoverable revenue uncollected. Theiatrics reviews every procedure for the correct billing pathway before submission.
Other Service
Optimize Operations for Maximum Efficiency
Contact us to explore how our consulting can position your business as a frontrunner.
What Makes Dermatology Billing Services Uniquely Challenging?
Dermatology practices perform a wider variety of billable services than almost any other outpatient specialty. A typical dermatology day might include routine skin checks with E&M coding, multiple skin biopsies using technique-specific codes, benign and malignant lesion excisions coded by anatomical location and exact lesion size, Mohs surgery staged billing, phototherapy sessions, patch testing, biologics injections, and potentially cosmetic procedures that cannot be billed to insurance at all. Managing billing across all of these service types simultaneously requires deep specialty knowledge.
The skin biopsy codes alone were significantly updated in 2019 when CPT replaced the old 11100 and 11101 codes with a new six-code family that differentiates between tangential, punch, and incisional biopsy techniques. The technique used, not just the number of lesions, determines the correct code. Practices that continue coding biopsy technique based on habit rather than documentation are either overcoding or undercoding and may not know which until an audit surfaces the pattern.
Lesion excision coding adds another layer of complexity because the correct code depends on both the anatomical site and the measured diameter of the lesion plus the narrowest margin of excision. The measurement must come from the dermatologist's intraoperative documentation, not from the pathology report. Practices that size lesions from pathology rather than operative notes are selecting codes based on the wrong measurement source, creating compliance exposure on every excision claim.
Theiatrics manages every dimension of dermatology billing with specialty-specific expertise. We know the biopsy technique codes, the lesion size measurement rules, the Mohs surgery staging logic, the biologics authorization requirements, and the cosmetic versus medical distinction that keeps your billing compliant and your revenue cycle running cleanly.
The 2019 Skin Biopsy Code Update: What Every Dermatology Practice Must Know
Tangential (Shave) Biopsy
Used when the biopsy removes skin parallel to the skin surface using a blade or similar instrument. The specimen includes epidermis without full dermis. Code 11102 for the first lesion and 11103 (add-on) for each additional tangential biopsy in the same session. The procedure note must document the tangential technique clearly.
Punch Biopsy
Used when a circular punch instrument is used to remove a cylindrical core of skin through the dermis and into the subcutaneous fat. Code 11104 for the first punch biopsy and 11105 (add-on) for each additional punch biopsy in the same session. Punch biopsy codes reimburse higher than tangential codes, reflecting the deeper and more complete tissue sample.
Incisional (Excisional) Biopsy
Used when a scalpel is used to make a linear incision and remove a wedge of tissue that may extend into deep subcutaneous tissue or include the full thickness of skin and deeper. Code 11106 for the first incisional biopsy and 11107 (add-on) for each additional incisional biopsy. This is the highest-reimbursing biopsy category and requires clear procedural documentation of the incisional technique.
Why technique documentation matters financially: A dermatology practice performing 200 biopsies per month using a mix of techniques, but defaulting to 11104 (punch) for all of them without verifying the actual technique documented in each procedure note, may be systematically undercoding tangential biopsies that should be 11102 or overcoding cases that should be 11106. Either direction creates revenue error. Theiatrics reviews the technique documented in each procedure note before assigning biopsy codes.
Key Dermatology CPT Code Families We Work With Daily
Mohs Micrographic Surgery Billing: Stage by Stage
Mohs micrographic surgery is billed per stage, not per lesion or per day. A stage represents one excision of tissue and the complete histological examination of the specimen in the same surgical session. If clear margins are achieved in the first excision, only one stage is billed. If additional tissue must be removed because margins were not clear, that second excision and examination constitutes a second stage, and so on.
The first-stage codes differ based on anatomical location. Code 17311 is used for tumors on the head, neck, hands, feet, genitalia, or any location with a 1 cm or smaller diameter regardless of body location. Code 17313 is used for trunk, arms, or legs. Add-on codes 17312 and 17314 cover additional stages at the respective anatomical locations.
Code 17315 is used when more than five tissue blocks are processed in a single stage. Each additional block beyond five is reported with 17315. This code is frequently missed by practices that do not track tissue block counts carefully in the operative documentation, resulting in systematic underbilling for complex Mohs cases.
Post-Mohs reconstruction is a separate billable service when the defect requires closure beyond simple layered closure. The repair codes (13100–13160 for complex repair, 14000–14350 for local skin flaps) are billed in addition to the Mohs codes and require separate documentation of the reconstruction performed.
First Stage — Head/Neck/Hands/Feet/Genitalia
First excision and complete margin examination at high-complexity anatomical sites. Includes processing of up to 5 tissue blocks.
Each Additional Stage — Head/Neck/Hands/Feet
Each subsequent excision and margin examination at high-complexity sites when clear margins were not achieved in the prior stage.
First Stage — Trunk/Arms/Legs
First excision and complete margin examination at trunk and extremity sites. Includes processing of up to 5 tissue blocks.
Each Additional Stage — Trunk/Arms/Legs
Each subsequent stage at trunk and extremity sites when additional tissue must be removed to achieve clear margins.
Additional Tissue Blocks Beyond 5 Per Stage
When more than 5 tissue blocks are processed in a single stage, each additional block beyond 5 is reported separately. Frequently missed in complex cases.
Our Complete Dermatology Billing Services
Skin Biopsy Technique Coding
We review each biopsy procedure note to identify the technique used — tangential, punch, or incisional — and assign the correct 2019-updated biopsy code family. Add-on codes for additional biopsies in the same session are applied based on the technique documented, not habit.
Lesion Size and Location Coding
We code benign and malignant lesion excisions based on the anatomical location and the measured lesion diameter plus margin from the operative documentation, not from pathology reports. Every excision code is selected from the correct site-specific code family at the correct size range.
Mohs Surgery Staging Billing
We track stage counts and tissue block numbers for every Mohs case, applying the correct first-stage, additional-stage, and additional-block codes based on the operative documentation. We ensure the 17315 tissue block add-on is captured for complex cases where it applies.
Dermatology Biologics Billing
We manage J-code billing for dupilumab, secukinumab, ixekizumab, risankizumab, and other dermatology biologics, alongside prior authorization requests that document diagnosis severity, treatment history, and step therapy requirements for each payer.
Cosmetic vs. Medical Service Separation
We review every service performed by your practice and identify those with a legitimate medical indication that qualifies for insurance billing versus those that are cosmetic and must be billed to the patient directly, maintaining a clean compliance boundary between the two.
Phototherapy & Patch Testing Billing
We bill narrowband UVB, PUVA, and Goeckerman phototherapy sessions with the correct per-session codes and track frequency for medical necessity compliance. Patch testing is billed per antigen with appropriate substance-specific coding.
Prior Authorization Management
We manage prior authorization requests for dermatology biologics, phototherapy programs, and other services requiring payer approval, including step therapy documentation, diagnosis severity evidence, and reauthorization tracking for ongoing therapies.
Denial Management & Appeals
When a claim is denied, we identify the root cause, correct the issue, and resubmit within 48 hours. For medical necessity denials on biologics or phototherapy, we prepare appeal packages with clinical guidelines and documented treatment history to support overturn.
Revenue Cycle Reporting
You receive regular reports on collection rates by procedure category, denial root cause analysis, biologics authorization approval rates, and payer mix performance so your practice always has clear financial visibility across your full service spectrum.
Dermatology Billing Challenges We Solve Every Day
Wrong Biopsy Technique Code
Many dermatology practices default to one biopsy code regardless of the technique performed. Since the 2019 update, using 11104 (punch) for all biopsies when tangential or incisional techniques were performed results in either underpayment or overcoding — both create financial and compliance risk across a high-volume biopsy practice.
How we help: We review the biopsy technique documented in each procedure note and assign the correct code from the 11102-11107 family based on the method used, not a practice default. We flag notes where the technique is not clearly documented before billing.
Lesion Size Measurement Errors
Coding excision CPT codes based on pathology specimen size rather than the intraoperative measurement of lesion diameter plus margin is a common and suitable error. Pathology size is typically smaller than the excised specimen because tissue shrinks after removal and fixation.
How we help: We code excision procedures from the surgeon’s intraoperative documentation of lesion size and margin, not from pathology reports, ensuring each excision code reflects the actual defect size at the time of removal.
Missed Mohs Tissue Block Add-Ons
Code 17315 for tissue blocks beyond five per stage is one of the most consistently missed codes in Mohs surgery billing. When a complex stage requires processing eight tissue blocks, codes for the three additional blocks beyond the first five are frequently not captured, resulting in systematic underbilling for complicated Mohs cases.
How we help: We review the tissue block count documented in every Mohs operative note and apply 17315 for each block beyond five in any stage where the count warrants it, recovering revenue that most practices routinely leave uncaptured.
Cosmetic Service Compliance Errors
Billing cosmetic procedures to insurance without documented medical necessity is among the most serious compliance risks in dermatology. Conversely, self-paying patients for procedures with legitimate medical indications, such as actinic keratosis treatment or functional scar revision, results in preventable revenue loss.
How we help: We assess each service for the presence of a documented medical indication before determining the billing pathway. Services with documented medical necessity go through insurance. Services without it are billed to the patient with appropriate disclosure.
Biologics Authorization Denials
Dermatology biologics for psoriasis, atopic dermatitis, and alopecia areata require prior authorization from virtually all commercial payers. Most payers also require step therapy documentation showing the patient tried and failed conventional treatments. Missing this documentation results in automatic denial with limited recovery options after administration.
How we help: We manage the full biologics authorization process including step therapy documentation compilation, authorization submission, and tracking of renewal timelines so no injection session is administered without confirmed coverage.
Bundling Violations on Same-Day Services
Dermatology frequently involves multiple procedures in the same visit, and NCCI edits restrict billing certain code combinations together without proper modifier support. Billing an E&M visit on the same day as a procedure without modifier 25, or billing two excision codes that are bundled without a modifier exception, results in automatic claim denial.
How we help: Every claim is reviewed against current NCCI edits before submission. Modifier 25 is applied to E&M visits on procedure days when a separately identifiable evaluation and management service was performed. Modifier 59 or XU is applied when legitimately unbundling procedure codes.
Why Dermatology Practices Choose Theiatrics for Billing
The Revenue Dermatology Practices Leave Uncaptured
Most dermatology practices have at least two or three systematic billing gaps that compound month after month without anyone noticing. A practice that always defaults to punch biopsy codes regardless of technique may be underbilling incisional biopsies and overbilling tangential cases simultaneously. A high-volume Mohs practice that never bills 17315 for additional tissue blocks is leaving revenue on every complex case. And any practice that does not separate cosmetic services from medical services precisely is carrying compliance exposure on one side and lost insurance revenue on the other.
For a dermatology practice doing 150 Mohs cases per year where 30% have stages with more than five tissue blocks, systematically missing 17315 codes represents $15,000 to $30,000 in avoidable annual revenue loss from a single missed add-on code. Add biopsy technique miscoding, excision size undercoding, and NCCI bundling violations, and the total recoverable gap typically ranges from $50,000 to $150,000 per year at a mid-size dermatology practice.
Ready to Strengthen Your Dermatology Practice Revenue Cycle?
Let Theiatrics handle the biopsy technique coding, Mohs staging, cosmetic versus medical separation, biologics authorization, and denial management that dermatology billing demands. Start with a free billing review today.
Schedule My Free Audit →Answers to What Dermatology Billing Providers Ask Us Most
Answers to the questions dermatologists, practice managers, and billing directors ask us most when evaluating specialized billing support for their dermatology practice.
📞 Call Our Billing Team
Find Lost Revenue Before Claims Are Filed
We review recent encounters, identify missed or undercoded charges, and show exact revenue impact — before you commit to anything.
90 days of encounters reviewed
Codes matched with documentation
Exact dollar value identified
From certified specialists
100% risk-free audit
More Info
Get in touch with us
5900 Balcones Drive Ste 7988, Austin, Texas, 78731, USA
Follow Us On
© 2026 Theiatrics. All Rights Reserved