Skin biopsy coding: 11102-11107 by technique, explained.
Skin biopsy is dermatology's highest-volume procedure and one of its most commonly miscoded, because the 2019 CPT restructuring tied code selection to technique rather than to the generic act of "taking a biopsy." Three techniques, three code pairs, and a note that has to name which one was actually performed — get that wrong and the claim is either underpaid relative to the work done or indefensible on audit. This guide covers code selection by technique, the documentation the 2019 revision requires, the biopsy-versus-excision line that trips up same-session billing, and how the pathology code pairs with it.
Key takeaways
- The code follows the technique, not the word "biopsy." Since the 2019 restructuring, "biopsy performed" alone doesn't support any of the three code families — the note has to name tangential, punch, or incisional.
- Defaulting every biopsy to 11102 is the most common error in this family — a punch biopsy billed as 11102 isn't just miscoded, it's usually paid at the wrong rate, and the note contradicts the code on audit.
- Biopsy and excision of the same lesion the same session almost always bundles. An excision already includes the sampling function a biopsy performs, so billing both routinely is a common denial and an audit flag.
- 88305 bills separately, per specimen. Three biopsied lesions sent as three specimens typically supports three units of 88305 alongside the procedure codes, not one.
Code selection by technique
CPT restructured the skin biopsy family in 2019, replacing a single generic biopsy code with three technique-specific pairs. The base code covers the first lesion biopsied; the add-on covers each additional lesion biopsied by the same technique in the same session.
| Technique | What it actually is | First lesion | Each additional lesion, same session |
|---|---|---|---|
| Tangential | Shave, scoop, saucerization, or curette — removes a thin sample, not the full skin thickness | 11102 | +11103 |
| Punch | Cylindrical punch instrument through the full thickness of the skin, typically closed with one or two sutures or left to heal secondarily | 11104 | +11105 |
| Incisional | Blade wedge down through the dermis into subcutaneous tissue — a partial-thickness surgical cut, not a full lesion removal | 11106 | +11107 |
The add-on codes apply per additional lesion biopsied by the same technique, same session — not per additional pass on the same lesion. If a visit involves a shave biopsy of one lesion and a punch biopsy of a second lesion, that's 11102 plus 11104, not 11102 plus +11103; mixing techniques across lesions in the same visit means each technique gets its own base code, and only a third or later lesion using a technique already billed once triggers that technique's add-on code.
What the 2019 revision actually requires in the note
Before 2019, a single biopsy code covered the encounter regardless of method, so documentation habits built around that era often just record "biopsy of lesion performed" without stating how. That habit is now a coding gap, not a shortcut. The operative note has to name the technique — shave, punch, or incisional — explicitly enough that a coder or auditor can map it to one of the three families without inferring it from context. "Biopsy performed" alone doesn't support any of the three codes on its own; a coder facing that note has two options, neither good: guess, or query the provider before the claim goes out. Guessing wrong in either direction has a cost. Coding a punch biopsy as 11102 (the tangential code) usually underpays the practice for a more invasive procedure that was actually performed. Coding a tangential shave as 11104 (the punch code) overstates the work and is the version that draws an audit finding, because the note's described technique won't match the code billed.
EHR templates are the most common source of this error at scale: a template that defaults every biopsy order to the same code regardless of which technique the provider selects in the visit note creates a systemic mismatch that shows up across every chart pulled in a payer audit, not just an isolated one. Auditing template defaults against actual technique selection is worth doing once, deliberately, rather than catching it lesion by lesion after the fact.
Biopsy versus excision: the distinction that decides same-session billing
A biopsy samples a portion of a lesion to establish a diagnosis. An excision (11400–11646) removes the entire lesion, down to and including subcutaneous tissue, with a margin of normal tissue around it. That distinction — partial sampling versus full-thickness removal — is exactly why billing both codes for the same lesion in the same session is one of dermatology's most common NCCI bundling triggers: the excision already accomplishes what the biopsy was sampling toward, so most payers and NCCI treat the biopsy as included in the excision of that same lesion the same day.
There's a narrow, defensible exception. Where an intraoperative frozen section or other immediate pathology read genuinely changed the surgical plan — the biopsy result determined margin size, or whether to proceed to excision at all, in a way that wasn't already decided before the biopsy was taken — both codes can be billed with the distinction documented at the time of service and an appropriate modifier appended. What doesn't clear that bar: biopsying a lesion the provider had already decided to excise regardless of the result, then billing both codes as routine practice. That pattern is a bundling denial at best and an audit flag at worst, because the note itself usually shows the excision was already planned. The full pair-by-pair modifier indicator logic for this and other dermatology bundling combinations is in our dermatology NCCI edits and bundling guide.
Pairing with pathology: 88305
The biopsy procedure code and the pathology read are two separate line items, not one bundled service. Most routine skin biopsies — whether evaluating a suspected malignancy or an inflammatory condition — are read at the 88305 level (Level IV, surgical pathology, gross and microscopic examination), billed per specimen submitted to pathology. A visit where three lesions are biopsied and each is sent to pathology as its own labeled specimen typically supports three units of 88305, not one unit covering all three; a specimen count that doesn't match the number of lesions biopsied on the procedure claim is worth reconciling before either claim goes out, because the two are supposed to tell the same story.
Who bills 88305 depends on who reads the slide. If your practice employs the pathologist and processes the specimen in-house, you bill 88305 globally. If an outside reference lab performs both the technical processing and the professional read, the lab bills its own claim and your practice bills only the biopsy procedure code, not 88305 at all. A split only comes into play if your practice's pathologist reads a slide processed by an outside lab, or vice versa — in that narrow case, a 26/TC split on 88305 applies the same way it would on any other professional-versus-technical dermatopathology arrangement.
Do and don't
- Confirm the technique named in the note before coding — tangential, punch, or incisional — every time.
- Bill a separate base code per technique when a visit mixes methods across lesions.
- Reconcile the specimen count on the pathology claim against the lesion count on the procedure claim.
- Document the clinical decision the biopsy drove when billing it alongside a same-lesion excision.
- Don't let an EHR template default every biopsy order to 11102 regardless of the technique actually performed.
- Don't code from the word "biopsy" alone — query the provider if the note doesn't name the method.
- Don't bill a biopsy and an excision of the same lesion the same session as routine practice.
- Don't assume 88305 bills once per visit — it bills once per specimen.
Underpaid or denied on your dermatology biopsy claims?
We'll audit a sample of your recent biopsy claims for technique-versus-code mismatches, missed 88305 units, and same-lesion bundling errors, and show what's recoverable.
Frequently asked questions
How do I know which biopsy code to use if the operative note just says "biopsy performed"?
You can't safely pick one — since the 2019 CPT restructuring, the code follows the technique performed (tangential, punch, or incisional), and "biopsy performed" alone doesn't name any of the three. The note needs to state the instrument or method used: a shave, scoop, saucerization, or curette supports 11102/+11103; a punch instrument supports 11104/+11105; a full-thickness incisional wedge supports 11106/+11107. A generic note is a query-back to the provider before coding, not a default to whichever code the EHR template loads first.
Why does billing both a biopsy code and an excision code for the same lesion the same day usually deny?
Because an excision already removes the entire lesion with margins, which inherently includes and supersedes a partial diagnostic sample — NCCI and most payers treat the biopsy as included in the excision of that same lesion the same session. It's billable separately only when the biopsy drove a genuinely separate clinical decision, most commonly an intraoperative frozen section that changed the surgical plan before the excision was performed, documented with an appropriate modifier. Billing both routinely, where the excision was already planned regardless of the biopsy result, is one of dermatology's most common bundling denials.
Does the pathology code 88305 bill separately from the biopsy procedure code?
Yes — 88305 (Level IV surgical pathology, gross and microscopic examination) is the pathology service that reads the specimen the biopsy procedure code removed; the two are billed as separate line items, not combined into one. Most routine skin biopsies for suspected malignancy or inflammatory conditions are read at the 88305 level, one unit per specimen submitted, so a visit with three biopsied lesions sent as three separate specimens typically supports three units of 88305 alongside the biopsy procedure codes. Confirm whether your practice or an outside lab performs the professional interpretation, since that determines who bills 88305 and whether a 26/TC split 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.