Summary & Overview
CPT 27881: Below-Knee (Transtibial) Amputation, Immediate Prosthesis Fit
CPT code 27881 designates a below-knee (transtibial) amputation performed through the bones of the lower leg with closure of skin flaps and application of a cast that allows immediate prosthesis fitting. This surgical code is clinically important for management of limb-threatening ischemia, nonhealing wounds, and severe infection when limb salvage is not possible. Nationally, transtibial amputations have implications for surgical capacity, inpatient utilization, rehabilitation services, and prosthetic care pathways.
Key payers addressed in typical analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical description, typical sites of service, and the service line context for procedural billing. The publication outlines common modifiers and practical billing considerations where available, summarizes related clinical indications and care settings, and highlights areas relevant to payers and providers such as surgical coding specificity, perioperative care inclusion, and prosthetic fitting considerations.
This resource is intended as a national-level reference for coding, billing, and clinical context for CPT code 27881. Data not available in the input are noted where applicable.
Billing Code Overview
CPT code 27881 describes a below-knee (transtibial) amputation through the bones of the lower leg performed to relieve pain or remove nonhealing tissue in the setting of poor vascular supply. The procedure includes closure of remaining skin flaps around the amputation site and application of a cast configured to permit immediate fitting of a prosthesis.
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Service type: Surgical amputation (transtibial/below-knee amputation)
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Typical site of service: Inpatient hospital or ambulatory surgical center where operative surgical procedures and perioperative care are delivered
Clinical & Coding Specifications
Clinical Context
A 68-year-old male with long-standing type 2 diabetes mellitus and peripheral arterial disease presents with a nonhealing ischemic foot wound and progressive gangrene extending to the distal lower leg. The patient has undergone repeated wound care and revascularization attempts that failed to restore adequate perfusion. Pain is severe and limiting mobility. Vascular surgery evaluates the limb and determines that a transtibial (below-knee) amputation is required to remove nonviable tissue, control infection, and permit prosthetic rehabilitation. The operative workflow includes preoperative assessment and consent, perioperative antibiotics, performance of a below-knee amputation with creation and closure of skin flaps, preservation of appropriate bone length, hemostasis, and application of a cast or rigid dressing fashioned to permit immediate prosthetic fitting when clinically appropriate. Postoperative care includes pain control, wound checks, physical therapy for mobility and prosthesis evaluation, and coordination with prosthetics services.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the amputation is of the left lower extremity |
RT | Right side |