AHA Coding Clinic® for HCPCS - 2026 Quarter 1; Ask the Editor
Mastectomy with Pectoralis Major Muscle Excision
A patient with left breast carcinoma presented for a left total mastectomy. An elliptical incision was made circumferentially around the nipple-areolar complex. Skin flaps were developed superiorly, inferiorly, medially, and laterally extending to the clavicle, sternum, inframammary fold, and latissimus dorsi muscle. The breast tissue was dissected free from the pectoralis major muscle and excised in its entirety. The specimen was oriented to the axillary tail and submitted for pathologic evaluation. Following breast removal, inspection and palpation of the lateral aspect of the pectoralis major muscle revealed multiple nodular areas suspicious for metastatic disease. A partial resection of the pectoralis major muscle was performed at the 2 o’clock position on the chest wall, extending down to the pectoralis minor muscle and submitted as a new surgical margin. This specimen was designated as a new surgical margin and submitted for permanent section. Attention was then directed to the left axilla. Using a gamma probe and Scout localization, axillary tissue containing multiple lymph nodes was excised. Specimen radiography confirmed the clip and Scout within the specimen, which was submitted for frozen section. Further gamma probe interrogation demonstrated additional uptake near the chest wall. Additional axillary tissue was excised and submitted for permanent section. Reinspection of the chest wall revealed persistent nodularity involving the pectoralis major muscle, and additional portions of the pectoralis major were resected. Which CPT procedure code captures the mastectomy procedure with pectoralis major muscle excision? ...
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Article Overview
This premium article discusses coding considerations for an operative case involving mastectomy for breast carcinoma with additional excision of pectoralis major muscle tissue and submission of a new surgical margin. It is intended for coding professionals and others working with breast surgery documentation who need to understand how the operative note is interpreted for reporting purposes. The article focuses on the procedure context, surgical anatomy, and documentation elements that affect code selection.
Why This Topic Matters
Breast surgery cases can involve more than a single primary procedure, and the operative documentation may affect how the encounter is understood for coding and review. This article helps readers recognize the scope of the surgery and the significance of additional margin or muscle excision documentation.
What You Will Learn
- How to interpret operative documentation for a mastectomy case with additional tissue excision
- How the presence of margin-related documentation affects the coding review context
- What types of surgical details in a breast cancer case are relevant to procedure classification
- How operative anatomy and specimen handling are described in a breast surgery report
Who Should Read This
- Medical coders
- Coding auditors
- Clinical documentation specialists
- Revenue integrity professionals
- Breast surgery billing staff
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