Free dermatology coding tool
Lesion Excision Code Finder
Enter the measurements and this returns the excised diameter, the CPT code, and whether a repair may be separately reportable. Add several lesions to build a full encounter. It runs entirely in your browser. Nothing is sent anywhere, and no patient information is needed or should be entered.
Excised diameter
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The excised diameter formula
Excised diameter = greatest clinical diameter of the lesion plus twice the narrowest margin required for complete excision. Measure before excision. The specimen contracts once skin tension releases and contracts again in formalin, so sizing from the pathology report underpays every time.
CPT code tiers by site family
Trunk, arms, legs
| Excised diameter | Benign | Malignant |
|---|---|---|
| 0.1 to 0.5 cm | 11400 | 11600 |
| 0.6 to 1.0 cm | 11401 | 11601 |
| 1.1 to 2.0 cm | 11402 | 11602 |
| 2.1 to 3.0 cm | 11403 | 11603 |
| 3.1 to 4.0 cm | 11404 | 11604 |
| 4.1 to 5.0 cm | 11405 | 11605 |
| over 5.0 cm | 11406 | 11606 |
Scalp, neck, hands, feet, genitalia
| Excised diameter | Benign | Malignant |
|---|---|---|
| 0.1 to 0.5 cm | 11420 | 11620 |
| 0.6 to 1.0 cm | 11421 | 11621 |
| 1.1 to 2.0 cm | 11422 | 11622 |
| 2.1 to 3.0 cm | 11423 | 11623 |
| 3.1 to 4.0 cm | 11424 | 11624 |
| 4.1 to 5.0 cm | 11425 | 11625 |
| over 5.0 cm | 11426 | 11626 |
Face, ears, eyelids, nose, lips, mucous membrane
| Excised diameter | Benign | Malignant |
|---|---|---|
| 0.1 to 0.5 cm | 11440 | 11640 |
| 0.6 to 1.0 cm | 11441 | 11641 |
| 1.1 to 2.0 cm | 11442 | 11642 |
| 2.1 to 3.0 cm | 11443 | 11643 |
| 3.1 to 4.0 cm | 11444 | 11644 |
| 4.1 to 5.0 cm | 11445 | 11645 |
| over 5.0 cm | 11446 | 11646 |
Worked examples
Malignant · Trunk, arms, legs
1.5 + (2 x 1.5) = 4.5 cm
CPT 11606
Benign · Face, ears, eyelids, nose, lips, mucous membrane
0.8 + (2 x 0.3) = 1.4 cm
CPT 11442
Malignant · Trunk, arms, legs
3.0 + (2 x 0.5) = 4.0 cm
CPT 11605
Educational reference only. Not coding, billing, legal or medical advice. Verify every code against the current AMA CPT codebook, CMS NCCI edits, and the specific payer policy before submission. Rules current as of August 2026. Do not enter protected health information.