HCPCS G8658: Lower Leg/Foot/Ankle Residual Score Not Measured - OpenPayer

Summary & Overview

HCPCS G8658: Lower Leg/Foot/Ankle Residual Score Not Measured

HCPCS Level II code G8658 identifies a missing residual score for lower leg, foot, or ankle impairment because the patient did not complete the LEPF patient-reported outcome measure (PROM) at initial evaluation and/or near discharge, with no reason provided. Nationally, such codes matter for quality reporting, outcomes tracking, and claims documentation because they signal incomplete functional assessment in musculoskeletal and rehabilitation care. Proper use affects how providers document care pathways and how payers track outcome measure completion rates.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code's clinical purpose, common settings where it applies, and what its presence on a claim indicates about PROM completion. The publication also provides benchmarking and policy context where available, notes implications for clinical workflow and claims processing, and highlights documentation considerations tied to missing outcome scores.

This piece is intended for a national audience of coders, billing managers, rehabilitation clinicians, and policy analysts seeking clarity on the role of G8658 in outcomes reporting and claim documentation. Data not available in the input.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG8658HCPCS Level IIlower extremitypatient-reported outcomeLEPF PROMrehabilitationoutcome measurementclaims documentationquality reporting

Billing Code Overview

HCPCS Level II code G8658 reports a residual score for lower leg, foot, or ankle impairment that was not measured because the patient did not complete the LEPF PROM at initial evaluation and/or near discharge, with no reason given. The code documents a missing patient-reported outcome measure for the lower extremity.

Service type: Outcome assessment / patient-reported outcome

Typical site of service: Outpatient physical therapy, outpatient rehabilitation, or other ambulatory rehabilitation settings where LEPF PROMs are used.

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A patient presents to outpatient physical therapy for evaluation and treatment of post-operative ankle fracture rehabilitation. At the initial evaluation the clinician attempted to collect patient-reported outcome measures using the Lower Extremity Physical Function (LEPF) PROM, but the patient did not complete the instrument for unspecified reasons. The clinician documents observed impairments in the lower leg, foot and ankle (range of motion deficits, decreased weight-bearing tolerance, weakness, and gait deviation) and assigns a residual impairment score based on clinical assessment rather than a completed LEPF PROM. Near planned discharge the patient again does not complete the LEPF PROM, so the discharge residual score is recorded without a PROM-derived value.

Workflow: After evaluation, the therapist documents objective measures (goniometry, manual muscle testing, gait analysis) and documents the reason the LEPF PROM was not completed when known. Billing staff append the HCPCS Level II code G8658 to indicate a residual score for lower leg/foot/ankle impairment was not measured because the patient did not complete the LEPF PROM at initial evaluation and/or near discharge; the insurer is notified via claim remarks when required.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work required to document the residual score without PROM is substantially greater than typical due to complexity of assessment or extensive additional documentation.

HCPCS G9364: Sinusitis Caused by Bacterial Infection

HCPCS-G9842-METASTATIC-DISEASE-AT-DIAGNOSIS

HCPCS G9842: Metastatic Disease at Diagnosis

HCPCS-G0509-TELEHEALTH-CRITICAL-CARE-CONSULTATION-SUBSEQUENT

HCPCS G0509: Telehealth Critical Care Consultation, Subsequent

HCPCS-G9458-TOBACCO-CESSATION-INTERVENTION

HCPCS G9458: Tobacco Cessation Intervention for Documented Tobacco Users

HCPCS-G2126-ADVANCED-ILLNESS-WITH-FRAILTY-66-80

HCPCS G2126: Advanced Illness with Frailty, Ages 66–80

HCPCS-G8895-ORAL-ASPIRIN-ANTITHROMBOTIC-THERAPY-PRESCRIBED

HCPCS G8895: Oral Aspirin or Antithrombotic Therapy Prescribed

HCPCS-G0410-GROUP-PSYCHOTHERAPY-PARTIAL-HOSPITALIZATION-INTENSIVE-OUTPATIENT

HCPCS G0410: Group Psychotherapy in PHP/IOP, 45–50 Minutes

HCPCS-G9497-PREOP-SMOKING-ABSTINENCE-INSTRUCTION

HCPCS G9497: Preoperative Instruction to Abstain from Smoking

HCPCS-G2208-ADJUVANT-CHEMO-HER2-THERAPY-OMISSION

HCPCS G2208: Omission of Adjuvant Chemotherapy plus HER2-Targeted Therapy

HCPCS-G8650-KNEE-IMPAIRMENT-UNMEASURED-RESIDUAL-SCORE

HCPCS G8650: Knee Impairment Residual Score Not Measured

Showing 1–10 of 1996

Taxonomy Code	Specialty	Notes
`225100000X`	Physical Therapist	Primary clinicians performing LEPF assessments and documenting residual lower extremity scores.
`225200000X`	Occupational Therapist	May perform related functional assessments for foot/ankle/leg impairments affecting activities of daily living.
`208800000X`	Orthopedic Surgeon	Referring or co-managing physician for post-operative or fracture-related lower extremity impairment.
`207L00000X`	Podiatrist	Specialist managing foot and ankle conditions and providing assessment input on residual impairment.
`185H00000X`	Physical Therapy Assistant	May assist in repeated assessments and documentation under supervising therapist.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S82.891A`	Other fracture of lower leg, initial encounter for closed fracture	Common cause of lower leg impairment where LEPF PROM may be attempted but not completed; residual score documents impairment.
`S82.401A`	Unspecified fracture of lower end of right tibia, initial encounter for closed fracture	Typical post-fracture diagnosis leading to physical therapy and residual lower extremity scoring.
`M25.571`	Pain in right ankle and joints of right foot	Symptom-driven reason for PROM assessment; absence of PROM completion necessitates clinician-derived residual scoring.
`M77.51`	Achilles tendinitis, right leg	Tendon pathology causing functional impairment in foot/ankle assessed via PROMs or clinician scoring.
`M23.271`	Derangement of medial meniscus due to old tear or injury, right knee	Knee conditions can affect lower leg/foot function and are often included in LEPF assessments when lower extremity function is measured.
`R26.2`	Difficulty in walking, not elsewhere classified	Functional limitation commonly evaluated with PROMs; when PROM not completed, a residual score documents mobility impairment.
`Z98.890`	Other specified postprocedural states	Postoperative status that may be associated with residual lower extremity impairment requiring documentation without PROM data.
`M21.67`	Acquired deformity, right foot	Structural foot deformities that contribute to chronic impairment and are relevant when a PROM is not available to quantify function.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97161`	Physical therapy evaluation (low complexity)	Performed at initial visit to assess impairments when the LEPF PROM is not completed; supports clinician-derived residual scoring.
`97162`	Physical therapy evaluation (moderate complexity)	Used for more complex initial evaluations where clinical measures substitute for incomplete PROM data.
`97110`	Therapeutic exercises to develop strength and endurance, range of motion and flexibility	Common therapy intervention performed before discharge; documents functional treatment paired with residual scoring.
`97112`	Neuromuscular reeducation of movement, balance, coordination, kinesthetic sense, posture, and proprioception	Often used in ankle/foot rehabilitation and documented alongside residual impairment scores.
`97530`	Therapeutic activities, direct (one-on-one) patient contact	Functional task training that correlates with clinician assessment when PROM data are missing.
`97750`	Physical performance test or measurement (e.g., timed walk, functional capacity)	Objective performance measures that may be used to derive a residual score when the LEPF PROM is not available.

OpenPayer