HCPCS L5975: All Lower Extremity Prosthesis, Single Axis Ankle with Flexible Keel Foot - OpenPayer

Summary & Overview

HCPCS L5975: All Lower Extremity Prosthesis, Single Axis Ankle with Flexible Keel Foot

HCPCS Level II code L5975 designates an all lower extremity prosthesis combining a single axis ankle and a flexible keel foot. This integrated ankle‑foot prosthesis is used in ambulatory patients who require a prosthetic solution that provides controlled sagittal plane motion from the ankle with shock absorption and energy return from a flexible keel foot. Nationally, this code matters because it defines billing and benefit classification for suppliers, outpatient clinics, and payers covering prosthetic care.

Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for device selection, typical sites of service where the device is furnished, and what coverage considerations commonly arise across major payers. The publication summarizes benchmark elements such as common billing patterns and allowable service settings, highlights policy language and coverage criteria differences among major insurers, and provides guidance on coding nomenclature and documentation expectations.

This executive summary is written for a national audience and prepares clinicians, prosthetists, and billing professionals to understand where L5975 fits in prosthetic service lines, how major payers treat the code, and which operational and documentation elements are most relevant for reimbursement and compliance.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareL5975HCPCS Level IIlower extremity prosthesisankle-foot prosthesisprostheticsdurable medical equipmentoutpatient rehabilitation

Billing Code Overview

HCPCS Level II code L5975 describes an all lower extremity prosthesis that combines a single axis ankle with a flexible keel foot. This prosthetic component is intended to serve as a complete lower-limb prosthesis for patients requiring an integrated ankle-foot solution.

Service Type: Prosthetic lower extremity device

Typical Site of Service: Prosthetics/Orthotics clinic, outpatient rehabilitation facility, or durable medical equipment provider

Clinical & Coding Specifications

Clinical Context

A 68-year-old patient with a transtibial amputation and peripheral vascular disease presents to a prosthetics clinic for fabrication and fitting of a definitive lower extremity prosthesis. The treating prosthetist evaluates limb shape, socket interface needs, activity level, and gait. The prosthesis ordered is an all lower extremity device combining a single-axis ankle joint with a flexible keel foot to provide stability for ambulation and shock absorption. The clinical workflow includes: pre-prosthetic assessment and measurements, casting or digital scan of the residual limb, fabrication of a custom socket and alignment with the single-axis ankle and flexible keel foot assembly, initial fitting and alignment adjustments, patient training for donning/doffing and gait, periodic follow-up for adjustments, and documentation of medical necessity, functional goals, and outcome measures for coverage verification.

Coding Specifications

Modifier	Description	When to Use
`AA`	Data not available in the input.	Data not available in the input.

Modifier

HCPCS L6025: Transcarpal/Partial Hand Myoelectric Prosthesis

HCPCS-L6713-PEDIATRIC-MECHANICAL-VOLUNTARY-OPENING-HAND-TERMINAL-DEVICE

HCPCS L6713: Pediatric Mechanical Voluntary-Opening Hand Terminal Device

HCPCS-L7181-ELECTRONIC-ELBOW-MICROPROCESSOR-CONTROL

HCPCS L7181: Electronic Elbow with Microprocessor Simultaneous Control of Elbow and Terminal Device

HCPCS-L6970-INTERSCAPULAR-THORACIC-EXTERNAL-POWER-PROSTHESIS

HCPCS L6970: Interscapular-Thoracic External Power Upper-Extremity Prosthesis

HCPCS-L6930-BELOW-ELBOW-EXTERNAL-POWER-PROSTHESIS-SELF-SUSPENDED-SOCKET

HCPCS L6930: Below-Elbow External Power Forearm Prosthesis

HCPCS-L8515-GELATIN-CAPSULE-APPLICATION-DEVICE-TRACHEOESOPHAGEAL-PROSTHESIS

HCPCS L8515: Gelatin Capsule Application Device for Tracheoesophageal Voice Prosthesis

HCPCS-L5668-LOWER-EXTREMITY-BELOW-KNEE-MOLDED-DISTAL-CUSHION

HCPCS L5668: Lower Extremity Below-Knee Molded Distal Cushion

HCPCS-L8320-TRUSS-WATER-PAD-ADDITION

HCPCS Level II L8320: Truss Addition to Standard Pad, Water Pad

HCPCS-L5460-ABOVE-KNEE-NON-WEIGHT-BEARING-RIGID-DRESSING-APPLICATION

HCPCS L5460: Above-Knee Non-Weight-Bearing Rigid Post-Surgical Dressing Application

HCPCS-L6950-ABOVE-ELBOW-EXTERNAL-POWER-PROSTHESIS-INTERNAL-LOCKING-ELBOW

HCPCS L6950: Above-Elbow External Power Prosthesis, Internal Locking Elbow

Showing 1–10 of 472

`00`	Unspecified or no modifier.	Use when no specific modifier applies to the prosthetic claim.
`11`	Data not available in the input.	Data not available in the input.
`22`	Increased procedural services.	Use when unusually extensive planning, fitting or modification time is required beyond usual prosthetic fabrication.
`23`	Unusual anesthesia.	Rarely applicable for prosthetic fitting; applicable if significant anesthesia is required during a surgical prosthetic-related procedure.
`26`	Professional component.	Use when billing professional services separately from the device supply (e.g., prosthetist fitting/evaluation billed separately from the device).
`50`	Bilateral procedure.	Use when identical prosthetic components are provided for both lower extremities.
`52`	Reduced services.	Use when a reduced scope of prosthetic service is provided (partial fabrication or limited fitting).
`53`	Discontinued procedure.	Use if fabrication or fitting was begun but discontinued due to patient factors.
`54`	Surgical care only.	Use if only surgical component related to prosthesis is billed by a surgeon separate from the prosthetist.
`55`	Postoperative management only.	Use when only post-op management is billed separate from the initial service.
`56`	Preoperative management only.	Use when only pre-op management is billed separate from the device supply.
`62`	Two surgeons.	Use when two surgeons are involved in a surgical procedure related to prosthetic provision (rare).
`78`	Unplanned return to the operating room.	Use when return to OR for issues related to prosthetic implantation or revision is required.
`80`	Assistant at surgery.	Use when an assistant surgeon is billing for participation in a relevant surgical procedure.
`82`	Assistant not available.	Use when a qualified assistant is not available but assistance was provided.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist service.	Use when those clinicians perform and bill a covered professional service related to prosthetic evaluation or training.
`RR`	Recovery room.	Use when billing for facility services that include recovery room use tied to a procedure.

Taxonomy Code	Specialty	Notes
`225100000X`	Prosthetics and Orthotics	Certified prosthetists who design, fabricate, and fit the device.
`2080P0200X`	Physical Medicine & Rehabilitation	Physiatrists who manage rehabilitation goals and functional assessment.
`208VP0003X`	Physical Therapy	Physical therapists who provide gait training and functional mobility training post-fitting.
`207Q00000X`	Orthopedic Surgery	Orthopedic surgeons involved when surgical revision or residual limb procedures are required.
`363L00000X`	Vascular Surgery	Vascular surgeons involved when limb salvage or revascularization impacts prosthetic candidacy.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z43.4`	Encounter for fitting and adjustment of prosthetic limb.	Directly documents encounter for prosthesis fitting and is used to support medical necessity for fabrication and adjustments.
`Z89.611`	Acquired absence of right leg at knee level.	Describes the amputation level relevant to prosthetic prescription and component selection.
`Z89.612`	Acquired absence of left leg at knee level.	As above for the opposite limb; important when billing bilateral services or specifying laterality.
`I70.213`	Atherosclerosis of native arteries of extremities with intermittent claudication, right leg.	Underlying peripheral vascular disease is a common etiology for lower extremity amputation and impacts prosthetic candidacy and goals.
`M21.661`	Other acquired deformity, right lower leg.	Residual limb deformity can affect socket design and the need for specialized components like a flexible keel foot.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic(s) management and training, upper or lower extremity; initial orthotic fitting and training (includes assessment and follow-up).	Used for initial patient training and fitting sessions to teach donning, doffing, and mobility with the prosthesis.
`97763`	Orthotic and prosthetic supply; fitting and adjustment of a prosthetic device.	Covers professional time for fitting, aligning, and making post-delivery adjustments to the prosthesis.
`99456`	Work-related or medical disability evaluation services (impairment rating).	May be used when documenting functional/impairment status related to prosthetic prescription in occupational contexts.
`97001`	Physical therapy evaluation.	Used by physical therapists for baseline mobility assessment prior to prosthetic use.
`99213`	Office or other outpatient established patient visit, low to moderate complexity.	Used for routine follow-up visits to document progress, residual limb concerns, and adjustments.

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