A Complete Guide on Dermatology CPT Codes

Dermatology practices run on precision where every code matters. Biopsies, excisions, destruction procedures, Mohs surgery, all of them are captured with Current Procedural Terminology (CPT) codes. 

The American Medical Association updates CPT codes every year, and dermatology continues to be one of the busiest outpatient specialties in the United States. Skin conditions affect approximately 1 in 4 Americans, leading to millions of dermatology-related visits annually. These visits often involve procedures such as biopsies, lesion excisions, pathology reviews, Mohs surgery, and skin cancer treatments.

With such high procedure volume, accurate dermatology CPT coding is essential for proper reimbursement, compliance, and revenue cycle performance. High patient volume directly translates into frequent billing encounters, which makes coding accuracy essential.

What’s New in Dermatology CPT Codes for 2026

Stay compliant with critical 2026 dermatology billing updates affecting your revenue cycle:

• 400+ CPT code modifications effective January 1, 2026
• 288 new Category I codes added by AMA, with 84 deletions and 46 revisions
• Skin biopsy codes 11102-11107 now require precise documentation of lesion size before anesthesia
• Destruction codes 17000-17004 distinguish between methods: cryosurgery, electrosurgery, laser, chemical
• 630 new ICD-10-CM codes effective October 1, 2025, including expanded psoriasis, eczema, actinic keratosis classifications
• Medicare conversion factor 2026: $33.57 (qualifying APM) and $33.40 (non-qualifying)
• 2.5% efficiency adjustment affecting procedural codes across dermatology billing

These changes impact documentation requirements, claim processing, and reimbursement rates for dermatology practices globally. 

Why Dermatology CPT Codes Matter

Insurance payers demand specificity. Coders provide it through CPT coding. A claim only gets paid when it’s supported by documentation and the correct CPT code. Skin-related procedures rank among the highest volume in outpatient care. Reports from CMS show that dermatology consistently ranks within the top 10 specialties for Medicare billing volume. 

In 2026, with rising denial rates and stricter audit requirements, coding accuracy directly impacts Net Collection Rate, EBITDA margins, and cash flow predictability. Even a 1% drop in collections compresses margin significantly. 

Biopsy Codes – The Everyday Heroes

Skin biopsies appear in almost every dermatology claim. These codes, 11102 through 11107, cover tangential, punch, and incisional biopsies. Each additional lesion gets an add-on code. For example:

CPT 11102 –  Tangential biopsy of skin, including simple closure, when performed; single lesion. This code captures the first tangential biopsy procedure, removing a thin layer of skin tissue for pathological examination. Use for initial lesion only.   

CPT 11103 – Add-on code for each additional tangential biopsy beyond first lesion. Bills separately from base code 11102. Document each lesion’s location and dimensions. Commonly used when multiple suspicious lesions require pathological examination during a single dermatology visit encounter. .

CPT 11104 – Punch biopsy of skin, including simple closure, when performed; single lesion. This code captures punch biopsy using a circular blade to remove a cylindrical skin sample. Ideal for deeper tissue diagnosis requiring full epidermal and dermal layers.

CPT 11105 – Add-on code billing each extra punch biopsy beyond first lesion. Use with base code 11104. Document anatomical location and size for each additional lesion. Most common add-on code in dermatology claims due to frequent multiple biopsy scenarios. 

CPT 11106 – Incisional biopsy of skin, including simple closure, when performed; single lesion. This code captures incisional biopsy removing a wedge of tissue for diagnosis. Use for larger lesions requiring deeper sampling than punch biopsy provides.

CPT 11107- Add-on code for additional incisional biopsies beyond first lesion. Bills with base code 11106. Document each lesion’s location, size, and specimen type. Essential for multiple large lesions requiring wedge sampling. Prevents denial through complete documentation. 

Straightforward pattern. One lesion, base code. Additional lesions, add-on. Coders memorize this structure quickly because biopsy codes appear in almost every dermatology claim.

Lesion Destruction – Premalignant and Benign

Actinic keratoses and benign lesions are treated daily. The CPT world has clear rules distinguishing premalignant from benign destruction methods :

CPT 17000 – Destruction, premalignant lesions (including any preoperative and postoperative care), first lesion. This code bills destruction of the first premalignant lesion using cryosurgery, electrosurgery, laser, or chemical methods.

CPT 17003 – Add-on code for destroying 2 to 14 premalignant lesions. Bills with base code 17000. Count and document each lesion separately with sizes. Commonly used for widespread actinic keratosis on sun-damaged scalp, face, or forearms requiring multiple treatment sessions. 

CPT 17004 – Destruction, premalignant lesions, including any preoperative and postoperative care; 15 or more lesions (list in addition to primary code). This add-on code bills for 15+ premalignant lesions destroyed. Requires extensive documentation of all lesion locations and destruction methods used.

CPT 17110 – Destruction of benign lesions other than skin tags or cutaneous vascular proliferative lesions (eg, laser, electrocoagulation, cryosurgery, chemosurgery); up to 14 lesions. This code bills benign lesion destruction using any method. Document lesion type, size, and exact destruction technique per 2026 guidelines.

CPT 17111 – Destruction of benign lesions other than skin tags or cutaneous vascular proliferative proliferative lesions (eg, laser, electrocoagulation, cryosurgery, chemosurgery); 15 or more lesions. This add-on code bills for 15+ benign lesions destroyed. Provide comprehensive documentation of all lesion anatomical locations and methods.

Benign lesions follow 17110 and 17111. The numbers look similar, so coders often build quick reference sheets. It is common for dermatology coding teams to keep a laminated chart on the desk. Small details like this save minutes every day.

Benign vs Malignant Excision Codes

Excision codes can look intimidating at first. Location and size determine the exact code selection. They split into two main groups:

• 11400–11446 covers benign lesion excisions including margins and closure. Codes vary by body region (trunk/arms/legs, scalp/neck/hands/feet, face/ears/eyelids/nose/lips) and excised diameter size ranging from 0.5 cm or less up to 7.5 cm or greater.
• 11600–11646 cover malignant lesion excisions including margins and closure. Codes vary by body region (trunk/arms/legs, scalp/neck/hands/feet, face/ears/eyelids/nose/lips) and excised diameter size from 0.5 cm or less up to 7.5 cm or greater. Requires cancer diagnosis plus pathology confirmation.  

Location and size decide the exact code. For example, a 2.1–3.0 cm benign lesion on the arm becomes 11403. Same size, but malignant? Then 11603. This is where documentation quality drives code accuracy. When providers write size clearly, coders work faster and cleaner.

Mohs Micrographic Surgery – Precision in Action

Skin cancer treatment often uses Mohs surgery. Codes track stages on specific anatomical locations with precise sequencing requirements :

CPT 17311 – Mohs micrographic technique, including removal of gross tumor, resection of 1 or more tissue specimens, using one or more step-wise coded maps, for placement by the surgeon of the specimens for interpretation and microscopic examination by the surgeon, removing further tissue when necessary; first stage, location on face, ears, eyelids, nose, lips. This code bills the first Mohs stage on high-risk facial locations. 

CPT 17312 – Mohs micrographic technique, including removal of gross tumor, resection of 1 or more tissue specimens, using one or more step-wise coded maps, for placement by the surgeon of the specimens for interpretation and microscopic examination by the surgeon, removing further tissue when necessary; each additional stage (List separately in addition to primary code). This add-on code bills each additional Mohs stage beyond the first. 

CPT 17313 – Mohs micrographic technique, including removal of gross tumor, resection of 1 or more tissue specimens, using one or more step-wise coded maps, for placement by the surgeon of the specimens for interpretation and microscopic examination by the surgeon, removing further tissue when necessary; first stage, location on scalp, arms, or legs. This code bills the first Mohs stage on scalp/arms/legs. These locations have lower risk than facial Mohs, affecting reimbursement coding . 

Coders have to track which stage belongs where. Practices with dedicated dermatology coders report lower denial rates on Mohs claims.

Repair and Closure CPT Codes

After excision, there’s usually repair. Repairs fall into simple, intermediate, and complex based on wound categories. The numbers range from 12031 to 13121. Intermediate repair of a 2.5 cm wound on the arm? That’s 12031. More extensive undermining or layered closure? Then it may shift into complex repair.

CPT codes 12031–12035 cover simple repairs of superficial wounds across different body regions: facial areas (12031–12032), scalp/neck/trunk/arms (12033–12034), and hands/feet (12035), with sizes ranging from 2.5 cm or less to 2.6–5.0 cm. CPT 13121 covers complex repair requiring layered closure or extensive undermining on scalp, extremities, or trunk up to 2.5 cm. Document wound location, size before anesthesia, and closure technique for accurate coding. 

Understanding these definitions is critical because payers review closure documentation closely.

Pathology CPT Codes

Every biopsy needs a pathology review. CMS utilization data highlights 88305 as the most frequently billed pathology code nationwide, with dermatology contributing significantly :

CPT 88304 – Level III: Surgical pathology, gross and microscopic examination. This code bills Level III surgical pathology for routine tissue examination. Use for standard biopsies requiring basic histological analysis without special stains or immunohistochemistry.

CPT 88305 – Level IV: Surgical pathology, gross and microscopic examination. This code bills Level IV surgical pathology, the most common dermatology pathology code. Use for complex biopsies requiring detailed histological examination with higher diagnostic complexity.

CPT 88312 – Special stain, other than печат stains (e.g., mucin, iron, silver); each stain. This code bills special stains for tissue identification. Use for mucin, iron, silver stains requiring additional microscopic processing beyond standard histology.

CPT 88341 – Immunohistochemistry or immunoperoxidase, gross and microscopic examination; preliminary or screening procedure, one antibody. This code bills immunohistochemistry using one antibody for preliminary screening. Use for cancer marker identification requiring antibody-based tissue analysis.

Missing pathology reports for 88304-88305 trigger claim denials. Document specimen type and stain references. 

Phototherapy and Laser Treatment

Skin disease treatments now involve advanced therapies. Accurate coding ensures compliance while supporting patient access to innovative treatments.

CPT 96900 – Phototherapy (eg, ultraviolet A or B). This code bills UV phototherapy for skin conditions like psoriasis or eczema. Document treatment area, wavelength, and duration for accurate reimbursement coding.

CPT 96910 – Photochemotherapy (eg, PUVA), including oral or topical administering of photoactivating agent; first 25 cm². This code bills photochemotherapy for first 25 cm² treated. Document photoactivating agent type and treatment surface area precisely.

CPT 96567 – Photodynamic therapy by external application of light source to treat premalignant skin lesions (eg, actinic keratoses), any method; entire face. This code bills photodynamic therapy for entire face treatment. Document lesion type, light source method, and treatment area.

CPT 96920 – Laser treatment of superficial lesions (eg, laser ablation, laser thermolysis, laser photocoagulation), each lesion; first 1-14 lesions. This code bills laser treatment for 1-14 superficial lesions. Document laser type, lesion count, and anatomical location.

CPT 96921 – Laser treatment of superficial lesions (eg, laser ablation, laser thermolysis, laser photocoagulation), each lesion; each additional 15 or more lesions (List separately in addition to primary code). This add-on code bills laser treatment for 15+ additional lesions. Count and document each lesion separately with laser specifications.

Coding accuracy in this category ensures practices stay compliant while supporting patient access to innovative therapies.

Evaluation and Management (E/M) Codes

E/M codes, 99202 through 99215, still form the backbone of dermatology billing services. They apply to both new and established patients. The 2021 updates simplified coding based on time or medical decision-making. Dermatologists often bill a mix of E/M with procedural codes. Modifier -25 makes that possible by showing that a separate E/M service was provided in addition to a procedure.

Essential Dermatology Modifiers 

Modifiers bring context to codes. Incorrect modifier use is a top reason for claim denials per OIG reports. 

Modifier	Meaning	When to use
-25	Separate E/M on same day	E/M + procedure same visit
-59	Distinct procedural service	Different site, session, or procedure type
-51	Multiple procedures	2+ procedures same day, same provider
-76	Repeat procedure	Same procedure repeated same day
RT	Right side	Unilateral procedure on right
LT	Left side	Unilateral procedure on left

A report from the OIG once noted that incorrect modifier use is a top reason for claim denials. Coders who train on modifiers early tend to cut denial rates for practices.

Documentation Requirements for Dermatology Billing

Enhanced documentation standards ensure audit readiness and reduce claim denials in 2026.

• Document lesion size before anesthesia for biopsy and excision codes.
• Include pathology reports for 88304-88305 to prevent automatic denials.
• Specify destruction method (cryosurgery, electrosurgery, laser, chemical) per 2026 requirements.
• Record specimen type with special stains or immunohistochemistry references.
• Use EMR templates that auto-prompt for missing details: anatomic location, number of lesions, closure type.
• Document stage sequence for Mohs surgery with complete margin assessment.
• Track laterality using RT/LT modifiers for asymmetric procedures

Practices with automated documentation reduce rework and strengthen compliance significantly.

Staying Updated Without Falling Behind

Dermatology coding shifts every year. New CPT codes arrive, definitions expand, and payer edits under NCCI change what can and cannot be billed together. Coders who only rely on memory from last year eventually hit denials.

Updates are easier to manage when they’re broken into routines. Some practices run short “lunch-and-learn” sessions every quarter. Others keep a rolling digital binder with CMS transmittals, AAD coding bulletins, and payer policy alerts. Quick reference sheets work too, especially when shared across teams.

Documentation habits matter as much as code knowledge. Providers who consistently record lesion size, margins, number of specimens, and methods make coding clean. Coders who flag gaps early prevent delays. It’s a partnership, not a one-way street.

Audits should not feel like punishment. A light quarterly audit catches small drifts before they grow. Think of it like a system check on a computer. The goal is smooth operation, not finger pointing.

Technology plays a role. Many practices now use EMR templates that auto-prompt for missing details, anatomic location, number of lesions, closure type. That reduces rework and strengthens compliance.

And resources are always available. CMS, AMA, AAD, specialty blogs, and coding associations update guidance constantly. Following at least two or three of them builds confidence. Coding never stands still, and neither should coders.

FAQs

1. What is the CPT code for a skin biopsy?

Skin biopsy CPT codes range from 11102–11107, depending on the biopsy technique used (tangential, punch, or incisional) and the number of lesions biopsied. The first lesion is reported with a primary code, while additional lesions use add-on codes.

2. What is the difference between CPT 11102 and 11103?

11102 is used for the first tangential skin biopsy lesion, while 11103 is an add-on code reported for each additional tangential biopsy lesion performed during the same encounter. Accurate lesion count documentation is essential for correct coding.

3. Can a dermatologist bill an E/M visit with a biopsy?

Yes. A dermatologist may bill an E/M service with a biopsy when the evaluation is significant and separately identifiable from the procedure. In most cases, modifier -25 is required on the E/M code to support separate reimbursement.

4. How are lesion excision CPT codes selected?

Dermatology excision codes are selected based on whether the lesion is benign or malignant, the anatomical location, and the total excised diameter including margins. Accurate lesion measurement is critical for proper code selection.

5. What documentation is required for dermatology excision codes?

Documentation should include lesion size, margins, anatomical location, method of excision, and the final pathology diagnosis when available. Missing size or location details is a common cause of claim denials.

6. What is the difference between benign and malignant lesion excision codes?

Benign lesion excisions are reported with CPT codes 11400–11446, while malignant lesion excisions use CPT codes 11600–11646. Code selection depends on pathology findings, lesion size, and anatomical location.