Dermatology CPT codes cover one of the widest procedural ranges in outpatient medicine. A single provider might perform a shave biopsy, freeze 12 actinic keratoses, excise a basal cell carcinoma, and inject a keloid, all before lunch. Each of those procedures carries its own Current Procedural Terminology (CPT) code, add-on logic, and documentation requirements, which is part of what makes billing in dermatology a specialty unto itself. Get them right and reimbursement flows. Get them wrong and you join the roughly 14% of dermatology claims that end up denied, nearly double the healthcare industry average.
This guide breaks down the dermatology CPT codes your billing team needs to know in 2026, organized by procedure category with the modifier rules and documentation details that keep claims clean.
CPT codes are five-digit numeric codes maintained by the American Medical Association (AMA) that describe medical procedures and services for billing purposes. Every time a dermatologist performs a biopsy, removes a lesion, or conducts an office visit, the billing team assigns one or more CPT codes to that encounter.
CPT codes describe what was done. ICD-10 codes describe why it was done, the diagnosis. Both appear on every claim. A mismatch between the two (say, billing a malignant excision code with a benign diagnosis) is one of the fastest ways to trigger a denial.
Dermatology relies on CPT codes more heavily than most specialties because a typical office visit may include four or five distinct procedure types. A family medicine practice might bill 4-5 E/M codes regularly. A dermatology practice routinely uses dozens of procedure codes across biopsies, destructions, excisions, injections, and surgery, each with its own coding logic.
Coding errors cost money. The math is straightforward:
Dermatology practices experience initial denial rates around 14%, compared to the overall industry average of 11.8%. The gap exists because derm billing is procedurally dense. A single visit often generates multiple line items across different code families, each with its own bundling rules, modifier requirements, and documentation thresholds.
And those denied claims don’t just come back on their own. Up to 60% of denied claims are never resubmitted. That’s not delayed revenue. It’s gone. Across the healthcare industry, providers spent nearly $20 billion appealing denials in 2022 alone. For an individual dermatology practice, coding errors can drain 5-15% of annual revenue through a combination of outright denials, undercoding, and the administrative cost of reworking claims. (For a broader look at where coding fits into the full billing cycle, see our breakdown of the revenue cycle management steps.)
The financial impact breaks down into specific, preventable problems:
Dermatology CPT codes fall into several major groups. The sections below cover each category with the specific codes, add-on logic, and documentation rules your billing team needs.
The main categories:
Skin biopsies are among the most frequently performed dermatology procedures. The coding structure uses three base codes (one for each biopsy technique) plus add-on codes for additional lesions.
What trips up billing teams: The add-on codes (+11103, +11105, +11107) are only for separate lesions, not multiple samples from the same lesion. Each lesion needs its own documentation: number, size, anatomic location, and biopsy technique used.
Two other rules that matter:
Destruction codes cover cryotherapy (liquid nitrogen), electrosurgery, laser ablation, and chemical destruction. The coding logic differs based on whether the lesion is premalignant, benign, or malignant.
Malignant lesions are coded by anatomic location and size using ranges 17260-17286.
Skin tags use their own codes: 11200 (up to 15 tags) and +11201 (each additional 10).
Excision codes are organized by pathology (benign vs. malignant), anatomic location, and excised diameter.
Size measurement is where most of the money gets left behind.
Within each range, codes are tiered by size: 0.5 cm or less, 0.6-1.0 cm, 1.1-2.0 cm, 2.1-3.0 cm, 3.1-4.0 cm, and greater than 4.0 cm.
The margin measurement rule most teams get wrong: Excised diameter = lesion diameter + narrowest margins on each side. A 1.2 cm basal cell carcinoma with 0.4 cm margins on each side = 2.0 cm excised diameter. That pushes the code into a higher tier.
One detail that gets overlooked: measure before injecting local anesthetic. Anesthesia distorts tissue and can alter the measurement. Document the pre-anesthesia measurement in the operative note.
Undercoding excision margins costs an estimated $50-$80 per case. Recording only the lesion diameter without adding surgical margins drops the code to a lower tier every time. For a practice performing 200-300 excisions a year, that’s $12,000-$20,000 in lost revenue.
Don’t forget to code the repair separately when appropriate. Intermediate and complex closures (CPT 12031-13153) are not bundled into excision codes, and skipping them can mean $100-$200 left on the table per case.
Mohs micrographic surgery uses a stage-based coding structure that differs from standard excision coding. The surgeon acts as both surgeon and pathologist, removing tissue one layer at a time and examining each under a microscope until margins are clear.
A “stage” is one complete cycle: tissue removal, mapping, processing, and microscopic examination. A “tissue block” is each individual piece of tissue examined. Most Mohs cases require 1-3 stages, but complex tumors may need more.
Intralesional injections and phototherapy treatments have their own code families.
Common uses include keloid treatment, cyst injection, and psoriasis lesion injection. Remember to bill the drug supply code (J-code) alongside the injection procedure code.
When an injection is performed during the same visit as an E/M service, the injection may be coded separately. Modifier -25 must be appended to the E/M code, and the documentation needs to support both services independently. For injections administered by PAs or NPs, incident-to billing rules add another layer of requirements.
Cosmetic procedures are typically patient-pay, but accurate coding still matters for internal tracking, inventory management, and the cases where insurance does cover the service (medical-indication Botox for chronic migraine, for example).
For neurotoxins used for cosmetic purposes, Medicare and most commercial payers will not reimburse. Use ICD-10 code Z41.1 (“Encounter for cosmetic surgery”) and confirm patient financial responsibility up front.
When Botox or other neurotoxins are used for a covered medical indication, such as chronic migraine (64615) or cervical dystonia (64616), the same drug codes apply but the diagnosis code and documentation requirements change. Updated botulinum toxin billing guidelines took effect March 5, 2026.
These six errors account for most of what we see across the 200+ dermatology practices and 1,200+ providers we bill for. Every one of them represents real revenue walking out the door.
When a provider performs a significant, separately identifiable E/M service on the same day as a procedure, modifier -25 must be appended to the E/M code. Without it, most payers will deny the E/M portion entirely. An OIG audit found that dermatologists appropriately used modifier -25 in 90% of sampled claims. That remaining 10% adds up fast.
Revenue impact: $75-$150 per missed instance. For a busy practice, that’s $15,000-$40,000 annually.
We covered this above, but it bears repeating because it’s so common. Billers who record only the lesion diameter, without adding the surgical margins, code to a lower tier every time.
Revenue impact: $50-$80 per case, $12,000-$20,000 annually.
Excision codes don’t include intermediate or complex closure. If the provider performs a layered closure or flap repair after an excision, that repair should be coded separately (12031-13153). Many billing teams leave this off because they assume it’s bundled.
Revenue impact: $100-$200 per case, $25,000-$50,000+ annually.
Billing the base destruction code for each lesion instead of using the add-on structure. Five actinic keratoses treated with cryotherapy should be 17000 + 17003 x4, not 17000 x5.
National Correct Coding Initiative (NCCI) edits define which code pairs can and can’t be billed together. Dermatology-specific triggers include:
Billing teams that don’t check NCCI edits before submitting claims will see denials on these combinations every time.
Billing a malignant excision code with a benign diagnosis code (or vice versa) triggers an automatic denial.
This often happens when pathology results come back after the initial claim is submitted and the code isn’t updated to reflect the final diagnosis.
Good coding starts before the claim is submitted.
Document at the point of care. The operative note should include lesion size (pre-anesthesia for excisions), anatomic location, technique, number of lesions, and clinical indication. If the documentation doesn’t support the code, the code doesn’t get paid. We see practices lose the most revenue not on complex cases, but on routine ones where the provider didn’t record a measurement or specify a technique.
Use pathology reports to verify codes. When the path report comes back, cross-reference the diagnosis against the procedure code on the original claim. Benign vs. malignant determinations change the excision code family and reimbursement tier. Practices that build this cross-check into their workflow catch mismatches before payers do.
Know your modifiers. Modifier -25 (separate E/M), -59/-XE (distinct service), -76 (repeat procedure, same physician), and -51 (multiple procedures) each have specific documentation requirements. Using the wrong modifier, or skipping one that’s needed, is the most common root cause of dermatology denials.
Check NCCI edits before submission. CMS publishes the NCCI edit tables quarterly. Your practice management system should flag edit conflicts, but billers need to understand why two codes conflict so they can determine whether a modifier applies.
Train staff on dermatology-specific rules. General billing training doesn’t cover the lesion measurement, destruction stacking, or biopsy bundling rules that drive dermatology denials. Coders who handle multiple specialties often apply general surgery logic to derm procedures. It doesn’t translate. Coding accuracy shows up in the 4 metrics dermatology practices track most closely.
In our experience billing for 1,200+ dermatology providers across 42 states, the practices that maintain the highest collection rates share one trait: their billing operation understands dermatology-specific coding at a granular level. That’s the difference between an 85% first-pass clean claim rate and the 98%+ rate we maintain across our client base. If you want to benchmark your net collection rate, coding accuracy is the first place to look.
Q: What CPT codes are most commonly used in dermatology?
A: E/M codes (99213, 99214 for established patients), biopsy codes (11102 for shave biopsy, 11104 for punch biopsy), destruction codes (17000, 17110), and excision codes (11400-11446 for benign, 11600-11646 for malignant). The specific mix depends on the practice’s case mix and subspecialty focus.
Q: What CPT code is used for skin biopsy?
A: Three base codes, depending on technique: 11102 for tangential (shave) biopsy, 11104 for punch biopsy, and 11106 for incisional biopsy. Each has a corresponding add-on code (+11103, +11105, +11107) for additional lesions biopsied during the same session.
Q: How are lesion removal CPT codes determined?
A: Three factors: whether the lesion is benign or malignant (based on pathology), the anatomic location (trunk/extremities, scalp/neck/hands/feet, or face/ears/nose/lips), and the excised diameter (lesion size plus surgical margins). Those three variables map to a specific code within the 11400-11646 range.
Q: What CPT codes are used for Mohs surgery?
A: 17311 (first stage, head/neck/hands/feet/genitalia) or 17313 (first stage, trunk/arms/legs) as the base code. Additional stages use +17312 or +17314, and +17315 covers additional tissue blocks beyond five in any stage. Each stage is coded and documented separately.
Q: How do you code multiple lesion removals in the same visit?
A: It depends on the removal method. For excisions, each lesion gets its own code based on size, location, and pathology. There’s no add-on structure. For destructions, use the base code for the first lesion and add-on codes for additional lesions (e.g., 17000 + 17003 for each additional premalignant lesion). For biopsies, the same base + add-on logic applies (11102 + 11103 for additional shave biopsies). Modifier -59 may be needed when mixing destruction types on the same date.
Q: What is the difference between CPT and ICD codes?
A: CPT codes describe the procedure performed. ICD-10 codes describe the diagnosis. For example, 11102 is the CPT code for a shave biopsy, and D22.5 is the ICD-10 code for a melanocytic nevus of the trunk. Every claim requires both, and they must be clinically consistent. A mismatch between procedure and diagnosis will result in a denial.
