Lower Extremity Prosthetics (for Kentucky Only)

Coverage Summary

This policy defines UnitedHealthcare Community Plan coverage for lower extremity prosthetic devices for members in Kentucky only and is effective April 1, 2026. Coverage decisions for medical necessity reference the InterQual® CP: Durable Medical Equipment, Prosthetics, Lower Extremity as the primary clinical criteria.

The policy stance is mixed: some lower extremity prostheses are considered proven and medically necessary in certain circumstances per InterQual criteria, while specific technologies (for example, bone-anchored percutaneous limb prostheses and certain combined microprocessor/powered components) are designated unproven and not medically necessary due to insufficient evidence.

Policy snapshot & selected stats

Policy numberCS361KY.06

SubjectLower Extremity Prosthetics (Kentucky)

State-specific policyApplies only to Kentucky

Effective dateApril 1, 2026

StatusCURRENT

Explicitly listed unproven items3 (OPRA/osseointegration; endoskeletal knee-shin system with microprocessor control for K1/K2 AK or hip disarticulation/hemipelvectomy; combined microprocessor-controlled ankle-foot with power assist for specified amputation levels)

HCPCS codes referenced100+ L-codes listed (multiple L5xxx–L5xxx additions and L7xxx accessories)

Studies summarizedmultiple (systematic reviews, cohort studies, RCTs, evolving evidence reviews)

Key evidence notesHayes and ECRI reviews found limited/low-quality evidence for OPRA and powered MPAs; OPRA cohorts report PRO improvements but high infection/mechanical complication rates

OPRA cohort sizes notedn=51 (Hagberg 2022); n=111 (Hagberg 2020)

Clinical criteria referenceMedical necessity determined per InterQual® CP: Durable Medical Equipment, Prosthetics, Lower Extremity

Documentation requirementMedical record must fully support medical necessity; documentation may be required for review but does not guarantee coverage

Medical‑Necessity Criteria

Coverage Rationale / Medical Necessity

A lower extremity prosthetic for amputations is proven and medically necessary in certain circumstances. For medical necessity clinical coverage criteria, refer to the InterQual® CP: Durable Medical Equipment, Prosthetics, Lower Extremity.

ALL of the following

Member is in the state of Kentucky (policy only applies to Kentucky).
Medical necessity determined per InterQual® CP: Durable Medical Equipment, Prosthetics, Lower Extremity (referenced criteria).
External InterQual® reference: click above to view criteria.

Use of External Criteria and Guidelines

Sources used to determine medical necessity when applicable:

ref":"b1_1","title":"Use of External Criteria and Guidelines"},{

Unproven / Not Medically Necessary

Documentation Requirements & Prior Authorization

Prior Authorization

Clinical criteria referral to InterQual

Coverage determination for lower extremity prosthetics requires that the requested service meet the InterQual® CP: Durable Medical Equipment, Prosthetics, Lower Extremity clinical criteria. Providers seeking prior authorization should reference the InterQual criteria when submitting requests; InterQual is the primary criteria used to evaluate medical necessity for these services.

All prior authorization requests for lower extremity prosthetics are reviewed against the InterQual® CP criteria.
When requesting authorization, include the specific InterQual guideline name and version or ID used to support the request.

Documentation Required

Medical record documentation requirement

The patient’s medical record must fully document and support the medical necessity of the requested prosthetic device. Records must be legible, maintained in the member’s medical record, and made available upon request. Submission of documentation for review does not guarantee approval.

Coding

Applicable HCPCS L‑codes (lower extremity prostheses and additions)HCPCS

L5000	Partial foot, shoe insert with longitudinal arch, toe filler.
L5010	Partial foot, molded socket, ankle height, with toe filler.
L5020	Partial foot, molded socket, tibial tubercle height, with toe filler.
L5050	Ankle, Symes, molded socket, SACH foot.
L5060	Ankle, Symes, metal frame, molded leather socket, articulated ankle/foot (SACH).
L5100	Below knee (BK), molded socket, shin, SACH foot.
L5105	Below knee (BK), plastic socket, joints and thigh lacer, SACH foot.
L5150	Knee disarticulation (or through knee), molded socket, external knee joints, shin, SACH foot.
L5160	Knee disarticulation (or through knee), molded socket, bent knee configuration, external knee joints, shin, SACH foot.
L5200	Above knee (AK), molded socket, single axis constant friction knee, shin, SACH foot.

1–10 of 199

1/20

Informational - FDA device classification mentionedmixed

No codes listed

Background & Evidence Summary

Background definitions include Activities of Daily Living (ADLs) and Instrumental Activities of Daily Living (IADLs), and the CMS/Medicare Functional Classification Levels K0–K4 used to describe rehabilitation and ambulatory potential. The policy also defines device categories such as microprocessor-controlled ankle-foot prostheses, microprocessor-controlled lower limb prostheses (MPKs), and roles of the prosthetist.

The document describes prosthesis purpose and common amputation levels, noting transtibial (below-knee, BK) and transfemoral (above-knee, AK) amputations as the most common, and that prostheses aim to restore function for ambulation, ADLs, and return to activities or work.

Clinical evidence summaries are provided: bone-anchored percutaneous limb prostheses (e.g., OPRA) have limited low-quality data with high infection and mechanical complication rates and are considered unproven; microprocessor knees have supportive literature for higher-functioning community ambulators (K3/K4) though evidence is limited for lower K-levels; and powered or microprocessor-controlled ankle-foot components have promising small studies but overall insufficient high-quality evidence to broadly support their safety and effectiveness.

Source / Study	Key finding or metric
Hayes Evolving Evidence Review (2023; updated 2025)	Found low-quality studies and no clear support for OPRA; identified high rates of revision and infection; 2024/2025 updates did not change level of support
ECRI assessment (2022)	Concluded evidence inconclusive for OPRA; limited low-quality studies and frequent serious complications (infection, implant loosening)
Sinclair et al. (2022) FDA IDE prospective study (n=10)	Some promise but notable device removals and infections; 2 of 10 lost to follow-up due to device removal; small sample
Hagberg et al. (2022) prospective cohort (n=51, 10-year follow-up)	PRO improvements: Q-TFA prosthetic use +36, mobility +18, problem score −28, global +38 (all p<0.001); SF-36 physical functioning +26 (p<0.001); 10-year revision-free survival: implant revision 83% (CI 69–91%), deep infection 65% (CI 49–77%), mechanical complications 17% (CI 7–29%); mechanical complications 3.9 per 10 person-years
Hagberg et al. (2020) longitudinal cohort (n=111)	At 2–10 years Q-TFA showed increased prosthetic use, mobility and fewer problems; 55% had ≥1 mechanical complication; ~40% had repeated fractures; fixture remained stable over 15 years but complications frequent
Brånemark et al. (2019) nonrandomized (n=51, 5-year)	5-year fixture survival 92%; numerous adverse events: multiple superficial skin infections (34 patients), 14 deep infections in 11 patients, 43 mechanical complications in 15 patients; many used prosthesis ≥13 hrs/day
Toderita et al. (2024) one-year follow-up case series	Small case series (n=4) showed improved Q-TFA scores and more natural gait patterns in some participants but heterogeneous changes in walking speed; limited generalizability
Ranaldi et al. (2023) two-center comparative gait study (BAP n=9, SSP n=9, able-bodied n=8)	Bone-anchored and socket-suspended prostheses restored gait parameters equally at self-selected speeds; BAP had shorter step width and double support duration vs SSP
OPRA adverse event metrics (summarized across studies)	Mechanical complications: 3.9 per 10 person-years; deep infection incidence unchanged over time; high revision rates (revision >85% in some long-term studies per Hayes summary)

Definitions

Term	Definition
Activities of Daily Living (ADLs)	Basic tasks such as bathing, grooming, dressing, toilet use, eating, and physical ambulation
Instrumental Activities of Daily Living (IADLs)	Complex activities related to independent living such as shopping, transportation, meal preparation, housecleaning, managing finances and medications
CMS Modifiers/Medicare Functional Classification Level (MFCL) K0-K4	Classification of member rehabilitation potential: K0 no potential; K1 household ambulator; K2 limited community ambulator; K3 community ambulator with variable cadence; K4 high impact/athlete
Microprocessor Controlled Ankle Foot Prosthesis	Device that actively changes ankle angle and identifies slopes/stair ascent/descent using microprocessor control and sensors
Microprocessor Controlled Lower Limb Prostheses	Prosthetic knees offering dynamic control via sensors to simulate normal knee function (examples: Otto‑Bock C‑Leg, Ossur RheoKnee, Endolite Intelligent Prosthesis)
Prosthetist	Healthcare professional who makes and fits artificial limbs
MPK	Microprocessor-controlled prosthetic knee (abbreviation MPK)
NMPK	Non-microprocessor-controlled prosthetic knee (abbreviation NMPK)
OPRA	Osseointegrated Prosthesis for the Rehabilitation of Amputees implant system
MFCL / K-level	Medicare Functional Classification Level describing ambulatory potential (eg, K0–K4)
MPA / PwrAF	Microprocessor-controlled or powered prosthetic ankle/ankle-foot component (abbreviations MPA / powered ankle-foot PwrAF)
ESR / ESAR	Energy storage and return (foot) prosthesis (abbreviations ESR / ESAR)
TTA / UTA	Transtibial amputation / unilateral transtibial amputation

Revision History

2026-04-01addedLatest

Added language clarifying that benefit coverage is determined by federal, state, or contractual requirements and applicable laws; that medical records documentation may be required to assess whether the member meets clinical criteria for coverage but does not guarantee coverage; and that the patient's medical record must contain documentation (including relevant medical history, physical exam, and diagnostic test results) that fully supports medical necessity and is legible and available upon request.

updatedLatest

Updated Clinical Evidence and References sections to reflect the most current information.