Summary & Overview
CPT 27329: Extensive Excision of Soft Tissue Tumor, Thigh or Knee (<5 cm)
CPT code 27329 denotes an extensive surgical excision of a soft-tissue tumor in the thigh or knee region when malignancy (for example, sarcoma) is suspected, with the lesion and margins measuring under 5 cm. This procedure code captures higher-complexity oncologic soft-tissue resections of the lower extremity and matters nationally because of implications for surgical oncology practice patterns, hospital resource use, and payer coverage policies for cancer-directed operative care.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the code, an overview of typical sites of service (hospital OR or ambulatory surgical center), and the service type (extensive soft-tissue tumor excision of the thigh/knee). The publication summarizes common billing modifiers and coding considerations, describes how payers commonly handle authorization and coverage for oncologic resections, and outlines benchmarks and policy updates relevant to reimbursement and documentation requirements.
The content is intended for coding professionals, surgical oncologists, revenue cycle staff, and policy analysts who need a clear depiction of clinical intent, billing context, and the areas where documentation and payer policy intersect for CPT code 27329.
Billing Code Overview
CPT code 27329 describes an extensive excision of a tumor or mass in the soft tissues of the thigh or knee region, performed when a malignant process such as a sarcoma is suspected. The surgeon removes the mass along with surrounding soft tissues, with the combined diameter of the tumor and its margins measuring less than 5 cm.
Service type: Surgical excision of soft tissue tumor (extensive), lower extremity
Typical site of service: Hospital operating room or ambulatory surgical center, with the procedure focused on the soft tissues of the thigh or knee.
Clinical & Coding Specifications
Clinical Context
A 54-year-old patient presents with a progressively enlarging, deep-seated, painful mass in the anterior thigh. Imaging with MRI demonstrates a 4.2 cm heterogeneous soft-tissue lesion within the quadriceps compartment with irregular margins and radiographic features suspicious for sarcoma. Core needle biopsy yields a high-grade spindle cell neoplasm requiring definitive oncologic resection. The surgical team schedules an elective wide local excision of the tumor with en bloc removal of surrounding soft tissues to achieve negative margins. The procedure is performed in an outpatient or ambulatory surgery center when local resources, anesthesia plan, and expected complexity allow; it may occur in a hospital operating room for higher-risk patients or when reconstruction is anticipated.
Preoperative workflow includes multidisciplinary review (surgical oncology or orthopedic oncology, radiology, pathology, and medical oncology), staging imaging, informed consent describing the risk of recurrence and potential need for further resection or adjuvant therapy, and anesthesia evaluation. Intraoperatively, the surgeon identifies the lesion, marks oncologic margins, excises the mass with surrounding soft tissue, assesses specimen size (under 5 cm in greatest dimension), and sends the specimen for permanent pathology. Postoperative care includes wound checks, pain control, mobility precautions, coordination with oncology for adjuvant treatment if pathology confirms malignancy, and documentation of operative findings and margin status.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 |