If you’re searching for the CPT code for punch biopsy, the short answer is CPT 11104 for the first lesion and CPT 11105 for each additional lesion biopsied in the same session. Both codes are valid, active, and unchanged for 2026.
But knowing the code number alone will not keep your claims clean. You need to understand how to apply these codes across different body sites, how to handle multiple lesions, which modifiers to use, and what documentation payers actually require. This guide walks you through all of it, whether you work as a coder, biller, dermatologist, or practice administrator.
What Is a Punch Biopsy?
A punch biopsy is a minimally invasive procedure in which a physician uses a sharp, hollow cylindrical instrument to remove a small, circular core of skin tissue for laboratory analysis.
The physician presses the punch into the skin and rotates it to cut through the epidermis and dermis and sometimes into the subcutaneous fat producing a full-thickness sample for pathological examination.
Common punch tool sizes are 3 mm, 4 mm, and 5 mm. The wound is typically closed with a single suture or adhesive strip, and the specimen is sent to pathology. Physicians perform punch biopsies to investigate suspicious moles, rule out skin cancers (melanoma, basal cell carcinoma, squamous cell carcinoma), diagnose inflammatory conditions like psoriasis or lichen planus, evaluate bullous disorders, and assess alopecia or infections.
Understanding the clinical context matters because it ties directly to medical necessity documentation, which is what determines whether your claim gets paid or denied.
CPT 11104 – The Primary Punch Biopsy Code
CPT 11104 is the correct code when a single skin lesion is biopsied using the punch technique. The official AMA description: Punch biopsy of skin (including simple closure, when performed); single lesion.
Three things every coder must know about this code:
Simple closure is bundled. Whether or not the wound is sutured, simple one-layer closure is already included in CPT 11104. Billing it separately is one of the most common and easily avoidable errors in dermatology coding.
Punch tool size does not change the code. A widespread misconception is that 3 mm, 4 mm, and 6 mm biopsies require different codes. They do not. The 2019 AMA revision eliminated size-based distinctions from biopsy coding entirely. What matters is the technique (punch) and the number of lesions, nothing else.
These codes are current through 2026. CPT 11104 and 11105 were introduced January 1, 2019, replacing the deleted codes 11100 and 11101. They have remained unchanged in every subsequent CPT update, including the 2026 edition.
CPT 11105 – Add-On Code for Additional Lesions
When more than one lesion is biopsied by the punch technique in the same encounter, report CPT 11105 for each additional separate and distinct lesion. This is an add-on code, it cannot be billed alone and must always accompany 11104 (or 11106 in mixed-technique scenarios).
What makes lesions “separate and distinct”? The determination is clinical. Two lesions on the same arm can qualify if they are non-contiguous or have different suspected diagnoses. Two adjacent, clinically indistinguishable marks generally do not.
Practical example: A patient has three suspicious lesions biopsied, one on the back, chest, and arm:
- 11104 × 1 (primary lesion) + 11105 × 2 (two additional lesions)
- Do NOT report 11104 × 3 – this directly triggers denials and audit flags
Medicare FCSO guidance requires you to bill 11104 as one unit per line item, while you can submit 11105 with multiple units on a single line item to prevent duplicate denials.
Skin Biopsy CPT Code Quick Reference
| CPT Code | Biopsy Type | Use |
|---|---|---|
| 11102 | Tangential (shave) | First lesion |
| +11103 | Tangential add-on | Each additional |
| 11104 | Punch biopsy | First lesion |
| +11105 | Punch biopsy add-on | Each additional |
| 11106 | Incisional (wedge) | First lesion |
| +11107 | Incisional add-on | Each additional |
When you perform multiple biopsy techniques in one session for example, one punch and one shave report only one primary code by selecting the most invasive technique. Then capture the remaining biopsies with their corresponding add-on codes.
CPT Code for Punch Biopsy by Body Location
For the vast majority of skin sites, CPT 11104 and 11105 apply regardless of where on the body the biopsy is performed. However, certain anatomical locations have site-specific codes that override the general skin biopsy codes. Using 11104 at these sites is a coding error.
Standard Skin Locations Use 11104 / 11105
The following sites all use the standard punch biopsy codes: face, back, arm, leg, foot, scalp, chest, abdomen, neck, thigh, lower leg, and forehead. For bilateral sites (e.g., left arm and right arm), append Modifiers -LT and -RT to indicate laterality.
Anatomical Exceptions – Do NOT Use 11104
| Body Location | Correct Code | Reason |
|---|---|---|
| Lip | 40490 | Site-specific biopsy code |
| Tongue (anterior 2/3) | 41100 | Site-specific code |
| Oral mucosa | 40808 | Site-specific code |
| Vulva / Vulvar lesion | 56605 or 56606 | Gynecologic site-specific code |
| Perianal skin | 46606 | Site-specific code |
Always check CPT parenthetical notes and the index under “Biopsy/Skin Lesion/Punch” before defaulting to 11104.
Modifiers Guide for Punch Biopsy Billing
Use Modifier -59 when you perform different biopsy techniques on the same day for instance, a punch biopsy and a shave biopsy. This modifier signals to the payer that these are distinct, separately documented procedures. Medicare FCSO directs you to append -59 to the biopsy code itself when it risks being bundled not to the other surgical code.
Modifier -25 applies when an E/M visit occurs on the same day as the punch biopsy. Append -25 to the E/M code (not to 11104) and ensure documentation clearly supports that the visit addressed a separately identifiable clinical problem beyond the routine pre- and post-procedure work.
Modifiers -LT / -RT specify laterality and are useful, sometimes required, when biopsies are performed on opposite sides of the body.
Pathology Is Always Billed Separately
Many new billers assume CPT 11104 includes pathology, it does not. CPT 11104 covers only the physician’s procedural work. The pathologist or lab bills the laboratory analysis of the specimen separately under its own code, typically CPT 88305 (Level IV surgical pathology) for routine skin punch biopsy specimens. Always submit 88305 and 11104 on separate claims, since different providers bill each service independently. Bundling them together will trigger a denial.
Common Denial Reasons – and How to Prevent Them
| Denial Code | Cause | Fix |
|---|---|---|
| CO-4 | Modifier mismatch | Verify modifier rules per payer LCD |
| CO-11 | Diagnosis doesn’t support necessity | Use the most specific ICD-10 code available |
| CO-97 | Bundled into another procedure | Check NCCI edits; append -59 to biopsy code |
| CO-50 | Not medically necessary | Document diagnosis, lesion description, clinical reason |
| Duplicate denial | 11104 billed multiple times | Use 11104 once + 11105 for each additional lesion |
Pre-submission documentation checklist:
- Technique documented as “punch”
- Number and anatomical location of each lesion
- Clinical indication and medical necessity stated
- Specimen disposition noted (sent to pathology)
- Closure method documented if performed
- Correct ICD-10 code linked to each CPT code
- All required modifiers applied and supported
Conclusion
The CPT code for punch biopsy is straightforward: 11104 for the first lesion, 11105 for each additional one. Where practices lose money or face compliance risk, is in the execution: billing simple closure separately, repeating 11104 for multiple lesions, skipping Modifier -25 on a same-day E/M, or using 11104 for site-specific exceptions like vulvar or oral mucosa biopsies.
Get those details right, back them with solid documentation, and your punch biopsy claims will process cleanly every time.
Want fewer denials and faster reimbursements on your dermatology claims? Partner with a certified medical coding specialist. A professional billing audit typically recovers far more than it costs and helps you stay compliant going forward.