Dermatology CPT Codes and Billing Guidelines: The Ultimate 2025 Reference

Accurate dermatology coding is essential for maintaining regulatory compliance, ensuring timely reimbursements, and minimizing claim denials. As dermatologic procedures continue to evolve, so does the complexity of coding and billing. 

In this guide, we break down every dermatology CPT code you need to know from biopsies and lesion removals to Mohs surgery, laser therapy, E/M services, and more. No fluff, just clear, actionable coding insights tailored for busy practices like yours. Let’s simplify your dermatology billing.

Dermatology CPT Codes for Skin Biopsy

A skin biopsy allows dermatologists to collect tissue samples for diagnosing skin conditions like rashes, tumors, or infections. Coding these procedures correctly ensures accurate reimbursement and compliance.

Skin Biopsy CPT Codes:

• CPT 11102: Tangential biopsy (scoop, shave, saucerize, curette, etc.); single lesion
• CPT 11103: Each additional tangential biopsy (Add-on code)
• CPT 11104: Punch biopsy of single lesion, with or without simple closure
• CPT 11105: Each additional punch biopsy (Add-on code)
• CPT 11106: Incisional biopsy (e.g., wedge) including simple closure; single lesion
• CPT 11107: Each additional incisional biopsy (Add-on code)
• CPT 40490: Excision procedure involving the lip
• CPT 69100: Excision of external ear tissue

Always link add-on codes (11103, 11105, 11107) with their respective primary biopsy codes. Document lesion location, technique used, and number of samples taken.

CPT Codes for Lesion Removal

Dermatologists use chemical treatments, electrosurgery, cryosurgery, and laser therapy to remove skin lesions, whether benign, premalignant, or malignant.

Lesion Removal CPT Codes:

• CPT 17000: Destruction of premalignant lesion (e.g., actinic keratosis); first lesion
• CPT 17003: Destruction of 2 to 14 premalignant lesions
• CPT 17110: Removal of up to 14 benign lesions (excluding skin tags & vascular lesions)

Documentation Must-Haves:

• Diagnosis (benign vs. premalignant)
• Number of lesions
• Destruction method used (e.g., cryotherapy, electrosurgery)

Don’t confuse CPT 17110 with 17000; the former is for benign lesions; the latter is for premalignant ones.

Mohs Micrographic Surgery CPT Codes

Mohs surgery is a precise technique used to treat skin cancer by removing cancerous tissue layer by layer, followed by microscopic examination. It’s especially valuable for facial and high-risk areas.

Mohs Surgery CPT Codes:

• CPT 17311: Mohs surgery on face, hands, feet, neck; first stage
• CPT 17312: Each additional stage for face, hands, feet, neck (Add-on)
• CPT 17313: Mohs surgery on trunk, arms, or legs; first stage
• CPT 17314: Each additional stage on trunk, arms, or legs (Add-on)

Billing Guidance:

• Stage count matters: Report each layer removal with additional codes.
• Include pathology documentation, anatomical location, and technique used.

CPT Codes for Lesion Excisions

When skin lesions are surgically excised (not simply destroyed), it requires specific excision codes based on whether the lesion is benign or malignant, and its size and location.

Excision CPT Codes:

• CPT 11403: Excision of benign skin lesion (2.1–3.0 cm); trunk, arms, or legs
• CPT 11603: Excision of malignant skin lesion (2.1–3.0 cm); trunk, arms, or legs

Important: Always measure and document both:

• Lesion diameter
• Margins excised (e.g., 2 mm, 5 mm, etc.)

Example: If a malignant lesion measures 2.4 cm and includes 0.6 cm margins, the total excised diameter = 3.6 cm.

Wound Healing and Repair CPT Codes

Dermatological procedures often require wound repair, which can be categorized by complexity: simple, intermediate, or complex. Use repair codes when the wound is closed with layered sutures or flaps.

Wound Repair CPT Codes:

• CPT 12031: Intermediate repair of wounds (2.6–7.5 cm); scalp, axilla, trunk, or extremities
• CPT 12032: Intermediate repair (7.6–12.5 cm); same areas as above
• CPT 13120: Complex wound repair; 1.1–2.5 cm; scalp, arms, legs
• CPT 13121: Complex repair; 2.6–7.5 cm; same areas

Use these only when:

• Closure involves layered sutures (deep and superficial)
• The procedure involves extensive undermining or debridement
• Documentation supports higher complexity

Dermatology CPT Codes for Pathology Services

Pathology codes are used when a tissue sample is sent to a lab for microscopic examination, typically following biopsies, excisions, or Mohs surgery. These services ensure diagnostic accuracy and treatment planning.

Pathology CPT Codes:

• CPT 88304: Surgical pathology, Level III: gross and microscopic exam
• CPT 88305: Surgical pathology, Level IV: more complex specimen analysis
• CPT 88312: Special stains, including interpretation
• CPT 88341: Immunohistochemistry or immunocytochemistry, per specimen

Billing Insight: Match pathology codes to the type and complexity of tissue examined. Document medical necessity for special stains or additional analysis.

Dermatology CPT Codes for Laser Therapy & Phototherapy

To treat conditions like psoriasis, eczema, and precancerous lesions, clinicians often rely on laser and light-based therapies in both cosmetic and medical dermatology.

Laser & Phototherapy CPT Codes:

• CPT J7308: Topical aminolevulinic acid HCL (ALA) application
• CPT 96567: Photodynamic therapy (PDT) for malignant/premalignant lesions
• CPT 96900: Actinotherapy (ultraviolet light)
• CPT 96910: Photochemotherapy with PUVA (UVB and tar)
• CPT 96920: Laser treatment for inflammatory skin disease; 1st session
• CPT 96921: Laser treatment; subsequent sessions

Laser therapy may require prior authorization and documentation of medical necessity. Track the number of sessions for accurate billing.

Evaluation and Management (E/M) Dermatology Billing Codes

E/M codes are essential for reporting consultations, new patient evaluations, and ongoing management. Selecting the correct E/M code depends on patient status (new vs. established) and time or complexity.

New Patient E/M Codes:

• CPT 99202: 15–29 mins, straightforward medical decision-making (MDM)
• CPT 99203: 30–44 mins, low MDM
• CPT 99204: 45–59 mins, moderate MDM
• CPT 99205: 60–74 mins, high MDM

Established Patient E/M Codes:

• CPT 99212: 10–19 mins, straightforward MDM
• CPT 99213: 20–29 mins, low MDM
• CPT 99214: 30–39 mins, moderate MDM
• CPT 99215: 40–54 mins, high MDM

Document total visit time or complexity to justify level selection. Use E/M codes in addition to procedural codes when evaluation exceeds the standard pre- and post-op service.

Dermatology CPT Codes with Modifiers

Modifiers provide critical context when multiple procedures are performed on the same day or when services fall outside routine expectations.

Key Dermatology Modifiers:

Modifier 25: Significant, separately identifiable E/M service by the same provider on the same day as another procedure

• Use only with E/M codes
• Do not use with new patient visits

Modifier 59: Distinct procedural service

• Use when procedures are performed on different anatomical sites or at different times on the same day

Improper modifier use is a common audit trigger. Always back up modifier usage with detailed chart notes.

General Dermatology Billing Guidelines

For clean claims and full reimbursement, follow these fundamental billing practices:

Dermatology Billing Best Practices:

1. Always Link Diagnosis Codes Correctly: Ensure ICD-10 codes match the CPT codes and support medical necessity.
2. Use Add-On Codes Properly: Codes like 11103, 11105, etc., should only be billed alongside their respective base codes.
3. Include Procedure Details in Documentation: Technique, size, number of lesions, anatomical location, and complexity must be clearly described.
4. Know When to Bill E/M Codes Separately: Only when the visit includes significant evaluation beyond the procedure.
5. Watch for NCCI Edits: Be aware of code pair edits to avoid denials — modifiers may be required.
6. Stay Updated with Payer Policies: Coverage and pre-auth requirements can vary by insurance provider and state.

Bottom Line

Dermatology billing is more than just coding; it’s a precision-based process where every detail counts. From biopsies and lesion removal to Mohs surgeries, pathology, and E/M services, each code plays a role in your practice’s revenue and compliance.

By using this complete guide as your CPT billing reference, you reduce errors, maximize reimbursements, and stay ahead of audits.Need help optimizing your dermatology billing? RevenueES offers expert Dermatology Medical Billing Services, ensuring clean claims, faster payments, and fewer denials. Let the professionals handle the complexities while you focus on patient care.