The short version
- Skin biopsy has three primary codes by technique: tangential (11102), punch (11104), and incisional (11106). Each has an add-on for additional lesions.
- Use more than one technique in a single encounter and you still report only one primary, the most invasive, plus add-ons. Not two primaries.
- Coding errors trigger one in four payer audits. Biopsy add-ons and bundling are a common one.
- A biopsy of the same lesion you then excise or destroy that day usually isn’t separately billable.
Three techniques, three families
Skin biopsy is not one code. It is three families, split by technique. Tangential, the shave, scoop, saucerize, or curette, is 11102 with +11103 for each additional lesion. Punch is 11104 with +11105. Incisional is 11106 with +11107.
The primary code reflects the technique, and the add-on reflects each additional lesion taken the same way. So the family is a documentation question first. Write down whether you shaved, punched, or cut, because the coder cannot pick 11102 versus 11104 from the word “biopsy” alone. The same theme runs through the rest of benign lesion coding: the note, not the label, picks the code.
One primary, even with two techniques
Here is the rule practices break most. When you use more than one technique in a single encounter, you report only one primary code, the most invasive one, and the additional lesions ride as add-ons.
Punch one lesion and shave two in the same visit, and it is 11104 for the punch plus two units of +11103 for the shaves. It is not 11104 and 11102 both as primaries. Bill two primaries and the payer pays the most invasive one and strips the second, and now you have an overage on the record instead of clean units. One primary, every encounter.
The add-on is where the leak is
The opposite mistake costs you quietly. Biopsy three lesions and report a single 11102, and you have left two units of +11103 on the table as a write-off nobody booked.
Add-ons are per additional lesion, same technique, no upper trick to them. Three shave biopsies is 11102 plus two units of +11103. Code the first and forget the rest and you have done the work for free. The clean habit is to count lesions in the note, then count units on the claim, and make the two match.
When a biopsy isn’t billable at all
A biopsy is diagnostic. If you biopsy a lesion and then excise or destroy that same lesion in the same session, the biopsy is generally bundled into the larger procedure and not separately billable. Reporting both is the kind of unbundling that draws a records request.
The exception is a genuinely separate lesion or site, where modifier 59 (or the X{EPSU} modifiers) tells the payer these were distinct. Use it because the lesions were distinct, not because you want both to pay. A biopsy billed alongside the destruction of the same lesion is the line that turns a clean claim into an audit.
What the note has to carry
Every one of these decisions traces back to the operative note. For each biopsy, document the technique, the site, the lesion, and the medical necessity. For multiple lesions, document each one, because a single line that says “biopsies taken” supports a single unit, not the four you performed.
With coding errors driving a quarter of all payer audits, the note is the difference between defensible add-on units and a clawback. If the volume of this is outrunning your front desk, our medical billing operation works dermatology coding and the audits that follow it.
Frequently asked questions
What is CPT 11102?
CPT 11102 is the primary code for a tangential skin biopsy, the shave, scoop, saucerize, or curette technique, for a single lesion. Each additional lesion biopsied the same way is reported with add-on code +11103.
Can you bill 11102 and 11104 together as primaries?
No. When more than one biopsy technique is used in a single encounter, you report only one primary code, the most invasive technique performed, and report the additional lesions with the appropriate add-on codes. Two primary biopsy codes on one encounter gets the second stripped.
How do you bill multiple skin biopsies?
Report one primary code for the first lesion (11102, 11104, or 11106 by technique) and the matching add-on (+11103, +11105, or +11107) for each additional lesion. When techniques differ, the primary is the most invasive one and the rest ride as add-ons.
Is a skin biopsy billable with an excision or destruction?
Generally not for the same lesion in the same session, where the biopsy is bundled into the larger procedure. A biopsy of a separate lesion or site can be billed with modifier 59 (or an X modifier) when the documentation shows the lesions were distinct.
Biopsy add-ons quietly turning into write-offs?
Dermatology coding leaks live in the add-ons and the bundles. Talk to us about putting clean units on every claim before they go out, not at appeal.
This article explains how these codes tend to get paid — it is not coding, billing, or legal advice. Some of the codes here are bundled into the main procedure, or fall into grey areas that vary by payer. Before billing anything in a grey area, confirm it with your own coding and compliance team and the current guidance from the American Academy of Dermatology (AAD), Medicare (CMS), and AMA CPT. When in doubt, don’t bill it.
