Cheek Carcinoma Excision with Rotation Flap and a Separate Neck Lesion
Dr. L excises a 3.2 cm basal cell carcinoma from the left cheek with 0.5 cm margins. The resulting defect measures 4.0 cm by 3.0 cm and is closed with a rotation flap. In the same operative session, he excises a separate 1.0 cm benign seborrheic keratosis from the right posterior neck and closes it simply. The pathology report confirms basal cell carcinoma and seborrheic keratosis. The operative note documents the flap design, the defect size, and the separate neck lesion. The coder is preparing the claim and wonders whether to report the cheek excision separately from the flap, and how to handle the neck lesion. The practice bills Medicare.
1. What CPT code should be reported for the cheek defect closure? Show the site and size reasoning.
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Report 14041 for adjacent tissue transfer or rearrangement of the cheek, defect 10.1 to 30 sq cm. The defect is 4.0 cm by 3.0 cm, which equals 12 sq cm. The cheek is in the anatomic group covered by 14040-14041. 14040 is for a defect of 10 sq cm or less, and 14041 is for 10.1 to 30 sq cm. Because 12 sq cm falls in the second range, 14041 is correct. The code covers the flap design, the undermining, and the closure of the defect. The size used for code selection is the defect size after excision, not the lesion size and not the flap length. The operative note should document the defect dimensions and the flap type; in this case it does.
2. Can the 3.2 cm malignant cheek excision be reported separately from the adjacent tissue transfer? Explain.
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No. The excision of the malignant lesion is included in the adjacent tissue transfer code. CPT guidelines state that when adjacent tissue transfer or rearrangement is performed, the excision of the lesion is not reported separately. The 3.2 cm cheek lesion would otherwise map to 11644 for a malignant lesion of the face, 3.1 to 4.0 cm, but reporting 11644 with 14041 on the same site would be unbundling. The lesion excision is part of the surgical episode that created the defect. The coder should report 14041 only for the cheek and should not add 11644 or a repair code. If the payer's claim system automatically bundles the excision, that is consistent with CPT. The pathology report still supports the medical necessity for the excision, but it does not create a separate billable service.
3. How should the separate 1.0 cm benign neck lesion be coded, and is the simple closure separately billable?
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Code 11421 for excision of a benign lesion from the neck, 0.6 to 1.0 cm. The neck is in the anatomic group for 11420-11426. The lesion size is 1.0 cm, which fits 11421. The simple closure is included in the excision code and is not separately billable. Because this is a separate lesion at a separate site from the cheek flap, it is separately reportable. Append modifier 51 to 11421 for multiple procedures, since 14041 is the major procedure and 11421 is an additional procedure. Do not append modifier 59 to 11421; modifier 59 is for distinct procedural service when a payer bundles the codes and the documentation supports a separate site, but 51 is the standard multiple-procedure modifier. If the payer denies 11421 as bundled, appeal with the operative note showing the separate right posterior neck site and the separate lesion.