Lesion destruction coding: actinic keratosis, benign, and malignant.
Destruction is billed by lesion pathology, not by the tool used to treat it, and that's exactly where practices lose money or trip an audit — three separate CPT families cover actinic keratosis, benign lesions, and malignant lesions, each with its own lesion-count or size logic, and the diagnosis on the claim has to actually match the family billed. This guide covers all three code families in full, the lesion-count threshold that changes reimbursement structure entirely, the AK-versus-malignant miscoding trap, and exactly what the note needs to defend the claim.
Key takeaways
- 17004 is not an add-on — it's a replacement. Once an actinic keratosis session hits 15 or more lesions, 17004 stands alone as a single flat code. Billing 17000 plus stacked +17003 units alongside it, or on top of it, overstates the claim.
- The AK-versus-malignant mix-up is the costliest error in this family. A biopsy-confirmed malignant lesion has to move to 17260-17286, not stay coded as AK destruction — and a lesion without a confirmed malignant diagnosis shouldn't be billed as malignant destruction just because it looked suspicious.
- Destruction method never changes the code. Cryotherapy, laser, chemical destruction, and electrodesiccation-curettage all map to the same lesion-type and count-band code — the method belongs in the note for medical necessity, not for code selection.
- Exact lesion count, by anatomic site, is the single most audited data point in this family. A note that says "multiple AKs treated" without a number doesn't support any code above 17000 on its own.
Three families, one decision point
Every destruction claim starts with the same question: what was the lesion, pathologically? That answer — not the anatomic site, not the technique, not how many minutes it took — is what routes the claim to one of three CPT families.
| Lesion type | Code logic | Driven by |
|---|---|---|
| Actinic keratosis (premalignant) | 17000 first lesion · +17003 each additional, 2nd–14th · 17004 single flat code for 15+ | Lesion count |
| Benign (excludes AK and skin tags) | 17110 up to 14 lesions · 17111 15 or more lesions, no per-lesion add-on | Lesion count |
| Malignant, confirmed | 17260–17266 trunk/arms/legs · 17270–17276 scalp/neck/hands/feet/genitalia · 17280–17286 face/ears/eyelids/nose/lips/mucous membrane | Lesion diameter and anatomic location |
Skin tags are a fourth, adjacent family that gets pulled into this one by mistake constantly — they're coded under 11200/+11201, not 17110, even though both are "destruction of a small benign growth" in plain language. If a claim mixes skin tag removal into a 17110 lesion count, the count is wrong on both codes.
Actinic keratosis destruction: 17000, +17003, 17004
AK destruction is the highest-volume code in this family for most general dermatology practices, and it's also where the lesion-count threshold has the most direct effect on the claim's structure. 17000 covers the first lesion destroyed in the session. +17003 is the add-on for each additional lesion from the second through the fourteenth — billed in units, one unit per lesion, up to thirteen units maximum alongside the single 17000. At the fifteenth lesion, the entire billing model changes: 17004 replaces the whole set as one flat code covering all AK lesions destroyed that session, regardless of whether the actual count is 15 or 40.
| Lesions destroyed | Correct billing |
|---|---|
| 1 | 17000 ×1 |
| 6 | 17000 ×1 + 17003 ×5 units |
| 14 | 17000 ×1 + 17003 ×13 units |
| 15 | 17004 ×1 only — not 17000 + 17003 ×14 |
| 32 | 17004 ×1 only — count above 15 doesn't add units |
The reimbursement math behind that threshold is why it matters operationally, not just as a coding trivia point. Each unit of +17003 up to the fourteenth lesion adds incremental value on top of 17000; 17004 pays a single flat rate regardless of whether the session treated 15 lesions or 45. That means the marginal value of the fourteenth versus the fifteenth lesion in a session isn't linear — it's worth confirming the exact count before submission, because a count that's miscounted by one or two lesions right around that threshold can put the claim in the wrong code entirely, not just the wrong unit count. Exact per-code dollar values are locality- and year-specific; check the CMS Physician Fee Schedule Look-Up Tool for your own locality rather than relying on a rate published here.
Benign lesion destruction: 17110 and 17111
This family covers destruction of benign lesions other than actinic keratosis and skin tags — common molluscum, viral warts, and seborrheic keratoses fall here when treated by destruction rather than excision. 17110 covers up to 14 lesions in the session as a single code, with no per-lesion add-on the way AK destruction has +17003; 17111 replaces it once the count reaches 15 or more, again as a single flat code, not a stack of units. The count that matters is destroyed lesions in that session across all anatomic sites, not lesions per site.
The most common billing error in this family is treating 17110 like it works the way +17003 does — trying to bill it per-lesion or attach unit counts the way the AK add-on allows. It doesn't; 17110 and 17111 are each single codes covering a lesion-count range, reported once per session regardless of how many lesions fall within that range.
Malignant lesion destruction: 17260–17286
Malignant destruction follows the same two-variable logic dermatology uses for excision: anatomic location sets which of the three code ranges applies, and lesion diameter sets which specific code within that range applies, banded across six ascending size tiers from 0.5 cm or smaller up through greater than 4.0 cm. Trunk, arms, and legs use the lowest-numbered range (17260–17266); scalp, neck, hands, feet, and genitalia use the middle range (17270–17276); face, ears, eyelids, nose, lips, and mucous membrane — the highest-risk cosmetic and functional sites — use the highest range (17280–17286).
What makes this family different from AK and benign destruction isn't the code structure, it's the diagnosis requirement behind it. A code from 17260–17286 has to be supported by a diagnosis that's actually malignant — a confirmed basal cell, squamous cell, or other skin malignancy diagnosis, typically from a pathology result already on file. That's the trap covered next.
The trap: AK code on a confirmed malignancy, or malignant code without confirmation
This is the single costliest coding error in the destruction family, and it runs in both directions.
- A lesion is biopsied, comes back basal or squamous cell carcinoma, and is then destroyed — but the destruction gets billed under AK codes (17000/+17003/17004) instead of moving to 17260–17286, either because the coder didn't see the pathology result or because the destruction was scheduled before the biopsy result came back and nobody updated the plan.
- A lesion looks clinically suspicious but was never biopsied or otherwise pathologically confirmed, and gets destroyed and billed under 17260–17286 anyway, with a malignant ICD-10 code attached on clinical impression alone rather than a confirmed diagnosis. This is a common audit trigger, because the chart doesn't support the diagnosis the claim reports.
The fix in both directions is the same workflow discipline: before the destruction claim goes out, confirm what diagnosis the chart actually supports as of that date of service, and route the code family to match it — not to whatever the visit was originally scheduled as. A biopsy result that comes back after the destruction was already performed still has to update the claim before submission, not after a payer catches the mismatch on audit.
Documentation requirements: lesion count and destruction method
- 1Exact lesion count, stated as a number. "Multiple AKs treated" or "several lesions destroyed" doesn't support anything past the first-lesion code. The note needs the actual count, and ideally the anatomic sites, especially anywhere near the 14-to-15 lesion threshold where the code family itself changes.
- 2Destruction method, named specifically. Cryotherapy (liquid nitrogen), laser ablation, chemical destruction, and electrodesiccation-curettage (ED&C) don't change the CPT code, but the method still needs to be in the note — it supports medical necessity and distinguishes a destruction encounter from a biopsy or excision on the same claim if either is also billed.
- 3Confirmed diagnosis on file before a malignant code is billed. The pathology report supporting a C44.x or other malignant diagnosis should be in the chart and dated before or on the date of service the destruction claim reports, not added retroactively.
- 4Lesion type distinguished from skin tags. If skin tags were also removed in the same session, they're coded separately (11200/+11201) and kept out of the 17110/17111 lesion count entirely.
Build a lesion-count field into the destruction order or procedure note template, not a free-text description. A structured count field is what actually prevents both the 14-vs-15 threshold error and the skin-tag miscount — a narrative note that just says "AKs treated" is where both errors hide until an audit finds them.
Destruction and E/M billed the same visit follow the same modifier-25 logic as the rest of dermatology's minor-procedure claims, and destruction of one lesion alongside biopsy or excision of a different lesion the same session commonly needs a 59 or X-modifier to clear an NCCI edit — both covered in full in our dermatology billing modifiers guide, including the multiple-lesion, multiple-technique modifier rules.
Losing revenue on destruction claims?
We'll audit a sample of your recent destruction claims for AK-versus-malignant miscoding, lesion-count threshold errors, and missing documentation, and show what's recoverable.
Frequently asked questions
What's the difference between the actinic keratosis and benign lesion destruction codes?
They're two separate CPT families keyed to two separate diagnoses. Actinic keratosis destruction is 17000 for the first lesion, +17003 for each additional lesion from the second through the fourteenth, and 17004 as a single flat code once a session reaches fifteen or more AK lesions. Destruction of benign lesions other than AK and skin tags — warts, molluscum, seborrheic keratoses — is 17110 for up to fourteen lesions and 17111 for fifteen or more, with no per-lesion add-on in between. Billing the wrong family doesn't just miscode the claim; it attaches the wrong diagnosis logic, since AK destruction should link to L57.0 and benign destruction should link to the specific benign diagnosis actually treated.
Can we bill malignant destruction codes without a biopsy confirming cancer first?
Clinically, yes in some cases — a physician can destroy a lesion based on clinical presentation alone without a preceding biopsy, and that's a legitimate treatment decision. Billing-wise, the malignant destruction codes (17260-17286) require a diagnosis that actually supports malignancy, which usually means a confirmed pathology result already on file, either from a prior biopsy of that same lesion or from tissue obtained and read at the time of destruction. Destroying a lesion on clinical suspicion alone and coding it as malignant destruction without a supporting pathology diagnosis is a common audit trigger; if there's no confirmed diagnosis, the benign or AK destruction codes are usually the defensible choice instead.
Does the destruction method (cryotherapy vs. laser vs. ED&C) change which CPT code we bill?
No. The 17000-17004, 17110-17111, and 17260-17286 code families are method-agnostic — cryotherapy, laser ablation, chemical destruction, and electrodesiccation and curettage all bill to the same code within a given lesion-type and count band, because CPT defines these codes by the lesion destroyed, not the tool used to destroy it. The method still belongs in the note, because it supports medical necessity and distinguishes destruction from an excision or biopsy on the same claim, but it doesn't change which of these codes applies.
Verify before billing. CPT is a registered trademark of the American Medical Association; codes here are paraphrased, not reproduced from the CPT Professional edition. CPT, HCPCS and ICD-10 codes, coverage policy, and bundling edits change, including annual code-set updates. This page reflects standard industry practice and is provided for general education — it is not a substitute for your own compliance review, your current payer contracts, or the current-year code sets. Confirm requirements against your specific payer mix before submitting claims.