CPT code 11105: Punch biopsy of skin, each additional lesion

Key takeaways

CPT Code 11105 covers a punch biopsy of skin, including simple closure if performed, for each separate lesion after the first.

11105 is an add-on code, so it cannot be reported alone. It must always be paired with CPT 11104, the primary punch biopsy code.

Billing 11105 without 11104, or using it for a tangential or incisional technique, are the two most common audit triggers for this code.

Practice management software like Pabau validates the fields a claim needs and tracks its status. That helps catch missing information before an 11105 claim goes out.

Punch biopsy billing trips up even experienced coders. One patient, four suspicious lesions, one dermatology visit. The right code combination protects your reimbursement and keeps you audit-clean. The wrong one triggers an NCCI edit denial before the claim leaves your system.

CPT Code 11105 is the add-on code for a punch biopsy on every lesion after the first. It came out of a 2019 overhaul that retired the old 11100/11101 pair for six technique-specific codes. This add-on always rides along with its primary counterpart, CPT 11104. Confirm that pairing before you submit the claim.

CPT code 11105 covers the punch biopsy of every lesion after the first

The American Medical Association (AMA) defines CPT Code 11105 as a punch biopsy add-on code. The official descriptor reads as follows. Punch biopsy of skin (including simple closure, when performed); each separate/additional lesion (List separately in addition to code for primary procedure).

Three elements define this code’s clinical and billing identity:

• Punch technique only. A circular punch instrument, typically 2-8 mm across, presses into the skin and rotates to remove a cylindrical core of tissue. Tangential (shave) and incisional methods use different codes entirely.
• Each additional lesion. 11105 applies to the second, third, and every lesion after that in the same session. The first punch biopsy lesion is always reported with CPT 11104.
• Simple closure included. Any simple wound closure performed after the punch biopsy is bundled into this code. Billing it separately alongside 11105 triggers an NCCI bundling edit.

The code sits under CPT Category I, Surgery section, Integumentary System. Its “+” prefix marks it as an add-on code, so modifier -51 never applies and it is always billed next to its primary code.

Six technique-specific codes replaced the old skin biopsy pair in 2019

Before 2019, every skin biopsy used just two codes: CPT 11100 for the first lesion, and 11101 for each additional one. That year’s CPT revision split them into six technique-based codes instead.

Picking the wrong technique code is one of the most common biopsy billing errors. The table below maps each code to its technique and its primary-or-add-on status.

Mixing technique codes in the same session, like pairing 11105 with CPT 11102, only works when the different techniques are genuinely used on separate lesions.

Document each technique-code pairing separately: the code has to reflect the exact clinical method performed, not whichever option is easiest to bill.

CPT 11105 only applies once 11104 is already on the claim

CPT Code 11105 cannot be reported alone. This is a hard AMA rule: 11105 must always ride along with CPT 11104 on the same claim. Think of it this way: 11104 covers lesion number one, and 11105 covers every lesion after that in the same encounter.

Example scenario: A dermatologist performs punch biopsies on four separate suspicious nevi during a single visit. The correct billing is 11104 x1 for the first lesion, and 11105 x3 for the three additional lesions. Each unit of 11105 corresponds to one distinct lesion, so the claim line carries a quantity of 3.

Situations where 11105 applies:

• Multiple punch biopsies performed in the same anatomical area during one visit.
• Multiple punch biopsies at different body sites in the same session, each separately documented.
• Full-body skin surveillance visits at a dedicated skin clinic, where mole mapping turns up multiple lesions that need tissue sampling.
• Follow-up biopsy sessions where additional lesions are biopsied alongside a new primary site.

11105 does not apply when the additional lesion was biopsied using a tangential or incisional technique instead. In that case, 11103 or 11107 applies to the add-on lesion, depending on the method used.

It also does not apply once the workup moves past biopsy. If pathology confirms malignancy, the follow-up excision uses a different code entirely, such as CPT 11643 for a malignant lesion on the face.

Weak documentation is what turns an 11105 claim into an audit target

Insufficient documentation is the leading reason for 11105 audits and retrospective denials. Payers reviewing these claims look for specific elements in the procedure note. A generic note that just says “biopsies performed” will not satisfy medical necessity review.

Using structured skin assessment documentation in your EHR makes this easier to standardize across providers. Each lesion needs these minimum elements:

• Biopsy technique confirmed as punch. The note must state “punch biopsy” explicitly, not just “skin biopsy.”
• Lesion site. Document each lesion’s location separately, like left forearm or right posterior shoulder. Vague notes like “back lesions x4” are not enough.
• Number of separate lesions. The note must account for each lesion individually, matching the number of 11105 units billed.
• Specimen submission. A pathology requisition or note entry confirming the specimen was sent for histopathological analysis.
• Simple closure notation. If closure was performed, note “simple closure” to confirm no separately billable repair was needed. Document a complex repair separately, since it may be billable in addition.
• Clinical indication for each lesion. Every biopsy site needs its own medical necessity justification, such as “irregular border, ABCDE criteria met” or “persistent pruritic plaque unresponsive to topical treatment.”

Digital procedure documentation built into a practice management platform can enforce these elements automatically, instead of relying on free-text notes.

CPT 11105 pays less than 11104, and locality moves the rate further

As an add-on code, CPT 11105 carries its own RVU value and reimbursement rate, separate from the 11104 primary code. The figures below are non-facility, or office, rates: national averages that the CMS Medicare Physician Fee Schedule updates each year. Geographic adjustment factors mean your actual payment will vary by locality.

Use the FastRVU RVU lookup tool to check current Work, PE, and malpractice RVU values for your own locality. Treat the rates above as a national average, not a submission-ready number. Private payers negotiate their own rates, which can run higher or lower than Medicare’s.

Modifier -51 is the one modifier you should never attach to CPT 11105

Because 11105 is an add-on code, several standard modifier rules apply differently than they would for a primary procedure. Misapplying a modifier here is a common reason for claim delays.

The modifier rule that matters most: never append modifier -51 to 11105. The AMA lists it in Appendix D of the CPT manual as an add-on code that is specifically exempt from the multiple-procedure reduction. Appending -51 anyway tells the payer you do not understand the code’s add-on status, and it can trigger a manual review.

The ICD-10 code has to justify the biopsy on its own, lesion by lesion

Every 11105 claim needs a supporting ICD-10 diagnosis code that justifies medical necessity for that specific lesion’s punch biopsy. Payer LCD (Local Coverage Determination) policies often spell out which diagnosis codes support biopsy reimbursement.

The AAPC CPT-to-ICD-10 crosswalk is a useful starting reference, though each payer’s own LCD governs what is actually covered.

Coders who handle a lot of dermatology claims usually keep a short list of diagnosis codes on hand for punch biopsies. The most common ones include:

Assign the most specific code available for each lesion site. Use a site-specific variant, like ICD-10 D22.4 for melanocytic nevi of the scalp and neck, instead of an unspecified code whenever the location is documented.

Connective tissue disease, coded as ICD-10 M35.9, is another diagnosis that can justify a biopsy. It often shows up when a persistent rash or nodule does not respond to treatment.

Four billing mistakes account for most CPT 11105 denials

OIG’s recent dermatology-billing audits have focused mainly on modifier -25 misuse. That happens when a same-day E/M visit is billed alongside a minor procedure, not on add-on pairing itself. Even so, the four patterns below are what actually trip up most 11105 claims.

• Billing 11105 without 11104. This is the most frequent rejection for this code. 11105 has no standalone billing status, so if 11104 is missing, 11105 denies. Some coders drop the primary code by accident when the visit’s focus is the multi-lesion count. Always confirm 11104 is on the claim before you submit.
• Using 11105 for a non-punch technique. If the additional lesion actually got a tangential (shave) biopsy, the correct code is 11103, not 11105. Verify the operative note before coding, since the code has to reflect the documented technique.
• Billing for simple closure separately. CPT 11105 already includes simple wound closure, so adding a simple repair code like CPT 12001 for the same site triggers an NCCI bundling edit. Intermediate repair (12051-12057) or complex repair (13100-13153) is different: document and bill that separately, since neither one falls inside what 11105 bundles.
• Insufficient lesion-level documentation. Billing four units of 11105 requires four individually documented lesion sites, each with its own medical necessity statement. A single note that just says “multiple punch biopsies performed” does not support four units. This is the leading cause of retrospective denials on audit.

Run a monthly internal audit of your 11104/11105 claims. Compare the number of 11105 units billed per claim against the number of lesion sites documented in the matching note. Even one mismatched lesion, repeated across several claims, is a pattern auditors notice.

CPT 11105’s 0-day global period does not mean everything else is free to bill

CPT Code 11105 carries a 0-day global period, so no post-procedural follow-up is automatically bundled into the code. Any medically necessary evaluation after the procedure date can be billed separately, with an appropriate E/M code.

That 0-day global period does not mean everything on the same day bills separately, though. NCCI edits still bundle these services into 11105:

• Simple wound closure (as noted above)
• Local anesthesia administration at the biopsy site
• Routine wound care instructions (bundled into the procedure)

What can be billed separately on the same day:

• An E/M service, or office visit, if it is medically necessary and separately identifiable from the biopsy decision. Append modifier -25 to the E/M code to flag it as a distinct service.
• Intermediate wound repair, like CPT 12053, when the closure needs a layered technique beyond a simple repair.
• Complex wound repair, like CPT 13101, when the wound needs more than layered closure, such as extensive undermining or a separate scar revision.
• Pathology interpretation codes (88302-88309) for the specimen analysis.

Understanding which services the global period bundles, and which need a modifier to unbundle legitimately, keeps a claim clean. The NCCI Policy Manual, available via CMS, is the definitive reference for which code combinations need a modifier and which do not.

Pabau keeps 11105 claims moving instead of stuck in review

Manual biopsy billing has a measurable error rate. Coders tracking add-on pairings, lesion counts, modifier eligibility, and documentation completeness across dozens of daily encounters are fighting the system’s complexity by hand.

Practice management software like Pabau removes some of that friction by handling the repetitive checks automatically.

Pabau’s claims management software checks that a claim carries every field an insurer requires before it can be sent. It will not let the claim go out until that is true. It also tracks each claim’s status afterward, so a coder can see exactly where an 11105 claim sits without calling the payer.

For a practice running high volumes of multi-lesion biopsy visits, catching one missing field before submission is what actually keeps denials down. Dermatology and skin-focused practices already lean on this, including a London skin clinic that runs its claims through the same system.

Practices managing skin biopsy workflows alongside broader clinical documentation can explore Pabau’s full toolkit for dermatology EMR software. It is built around structured procedure notes and claims tracking in one system.

Stop losing reimbursement on multi-lesion biopsy visits

Pabau checks that every required field is filled in before a claim goes out, then tracks its status until it is paid. That means fewer claims stall in review for something you could have caught upfront.

Book a demo

Conclusion

CPT Code 11105 is simple in concept, but it consistently generates denials. Most of those trace back to a misunderstood add-on pairing rule, incomplete documentation, or a missed modifier exemption. Every unit billed needs a matching 11104, a separately documented lesion site, and a note that confirms the punch technique.

Dermatology practices billing several punch biopsies per visit gain the most from tightening up these checks before a claim goes out.

Practice management software helps by validating the required fields and tracking each claim’s status. That catches the kind of problem that would otherwise surface as a denial weeks later. Book a demo to see how Pabau supports dermatology billing workflows like this one.

Continue your research

Billing a cosmetic skin excision instead of a diagnostic biopsy? CPT Code 15836 covers arm skin excision and shows how differently that procedure gets coded and paid.

Coding another high-volume dermatology procedure? CPT Code 11056 covers paring corns and calluses, a code with its own separate billing rules.

Billing a debridement alongside a biopsy visit? CPT Code 11042 walks through subcutaneous tissue debridement billing and its bundling rules.

Frequently asked questions