Summary & Overview
CPT 21935: Extensive Excision of Soft Tissue Malignant Tumor, Back or Flank (<5 cm)
CPT code 21935 represents an extensive surgical excision of a soft tissue malignant tumor (for example, a sarcoma) located on the back or flank, where the tumor and required margins measure less than 5 cm. This code captures procedures in which the surgeon removes not only the tumor but also adjacent tissue or anatomical structures at risk for involvement, reflecting higher complexity than a simple excision. Nationally, accurate use of CPT code 21935 is important for procedure classification, clinical tracking of sarcoma surgeries, and consistent facility and surgeon billing.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The content that follows outlines typical benchmarks and reimbursement considerations, coding specificity for surgical oncology, and the clinical context in which the code is used. Readers will find: national-level benchmarks and utilization patterns where available; summaries of relevant policy or coverage themes affecting surgical excisions for soft tissue malignancies; and clinical context to aid coding accuracy, including typical site-of-service expectations.
Data not available in the input is noted where applicable; the summary focuses on nationwide relevance rather than state-specific rules.
Billing Code Overview
CPT code 21935 describes an extensive excision of a soft tissue malignant tumor (such as a sarcoma) of the back or flank. The procedure involves removal of the tumor with wider-than-local margins to encompass surrounding tissue or anatomical structures suspected of involvement when the tumor and required margins measure less than 5 cm in diameter.
Service type: Surgical excision for soft tissue malignancy
Typical site of service: Hospital operating room or ambulatory surgical center, performed on the back or flank
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A 58-year-old patient presents to a surgical oncology clinic with a progressively enlarging, firm mass on the posterior thorax (mid-back) that was noted on imaging to be a soft tissue lesion suspicious for sarcoma measuring 4.2 cm in greatest dimension. Core needle biopsy returned a diagnosis of high-grade soft tissue sarcoma. The multidisciplinary team schedules the patient for operative management: an extensive wide local excision of the malignant soft tissue tumor of the back with intraoperative assessment of margins. The operative encounter includes preoperative surgical time for consent and planning, general anesthesia and monitoring in an ambulatory surgery center or hospital operating room, en bloc resection of the tumor with planned peripheral margins <5.0 cm, hemostasis, possible specimen orientation for pathology, and layered closure. Postoperative workflow includes immediate post-anesthesia recovery, pathology reporting of margins, and postoperative clinic follow-up for wound check and oncologic planning (radiation or systemic therapy discussion as indicated).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work, time, or complexity substantially exceeds typical for 21935 due to extensive dissection or unexpected intraoperative complexity. |