G2151 (HCPCS) Reimbursement & Policy Benchmarks | OpenPayer

Summary & Overview

HCPCS G2151: Documentation of Degenerative Neurological Condition

HCPCS Level II code G2151 denotes documentation that a patient has a degenerative neurological condition such as ALS, MS, or Parkinson’s disease diagnosed at any time before or during the episode of care. The code is used to capture and communicate the presence of a chronic neurodegenerative diagnosis in the medical record and on claims, supporting clinical care planning, utilization review, and appropriate benefit adjudication. Nationally, consistent use of G2151 affects case mix reporting and supports visibility of complex neurological populations across payers.

Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical purpose, typical service settings, and the payers commonly associated with its use. The publication summarizes available benchmarks and policy context where applicable, outlines common modifiers used with similar HCPCS Level II codes, and situates the code within clinical workflows for neurology and home-based care. This content is intended for billing managers, compliance officers, and clinical leaders seeking a clear, national-level summary of G2151 and how it is used to document degenerative neurological conditions.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG2151HCPCS Level IIdegenerative neurological conditionsneurology documentationdiagnosis reportinghome healthoutpatient billingmedical coding

Billing Code Overview

HCPCS Level II code G2151 documents that a patient has a diagnosis of a degenerative neurological condition such as amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), or Parkinson's disease diagnosed at any time before or during the episode of care. This code captures the presence of a chronic, progressive neurological disorder for inclusion in the medical record and billing documentation.

Service type: Diagnosis documentation / Clinical condition reporting

Typical site of service: Outpatient clinics, neurology practices, home health or community-based care settings where diagnosis and documentation occur

Clinical & Coding Specifications

Clinical Context

A typical patient is a 62-year-old individual with a known degenerative neurologic disorder such as amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), or Parkinson disease who is admitted for an episode of care (inpatient stay, SNF admission, or home health episode). Documentation of the pre-existing degenerative neurological diagnosis is required to support care planning, care coordination, and eligibility for certain services tied to the episode. The clinical workflow begins with the admitting clinician (hospitalist, physiatrist, or primary care provider) confirming the neurologic diagnosis in the history and problem list, documenting onset and pertinent disease features (functional status, respiratory or swallowing involvement, spasticity, mobility limitations, cognitive status). The diagnosis documentation is then reconciled by case management and medical coding staff during chart review to ensure appropriate episode categorization and billing with the G2151 HCPCS Level II code. Subsequent multidisciplinary notes (neurology, physical therapy, occupational therapy, speech therapy, respiratory therapy) reference the documented degenerative neurologic condition when justifying interventions, durable medical equipment, or home health plans related to the episode of care.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased Procedural Services	Use when the work required to document or manage the episode due to the neurologic condition is substantially greater than typical and documentation supports increased complexity.

HCPCS G0506: Comprehensive Assessment and Care Planning for Chronic Care

HCPCS-G2000-BLINDED-CONVULSIVE-THERAPY-TRIAL-SESSION

HCPCS G2000: Blinded Convulsive Therapy in IDE Clinical Trial

HCPCS-G2022-AMBULANCE-BENEFICIARY-REFUSES-TRANSPORT-OR-TREATMENT

HCPCS G2022: Ambulance Response - Beneficiary Refuses Transport or Treatment

HCPCS-G0665-TEAM-REMOTE-EVALUATION-MANAGEMENT-10MIN

HCPCS G0665: Team Remote E/M for Established Patient, 10 Minutes

HCPCS-G2172-ALL-INCLUSIVE-OUD-TREATMENT-DEMO-PAYMENT

HCPCS G2172: All-Inclusive Opioid Use Disorder Treatment Payment

HCPCS-G2181-BMI-NOT-DOCUMENTED-MEDICAL-REASON-OR-PATIENT-REFUSAL

HCPCS G2181: BMI Not Documented Due to Medical Reason or Patient Refusal

HCPCS-G2149-DOCUMENTATION-NO-MULTIMODAL-PAIN-MANAGEMENT

HCPCS G2149: Documentation of Reason for Not Using Multimodal Pain Management

HCPCS-G0571-INTRAOPERATIVE-NERVE-CRYOABLATION-POST-SURGICAL-PAIN

HCPCS G0571: Intraoperative Nerve Cryoablation for Post-Surgical Pain Relief

HCPCS-G0663-TEAM-REMOTE-E-M-NEW-PATIENT-45-MINS

HCPCS G0663: Team Remote E/M for New Patient, 45 Minutes

HCPCS-G9506-BIOLOGIC-IMMUNE-RESPONSE-MODIFIER-PRESCRIBED

HCPCS G9506: Biologic Immune Response Modifier Prescribed

Showing 1–10 of 1996

Taxonomy Code	Specialty	Notes
`207RH0000X`	Physical Medicine & Rehabilitation	Commonly involved in functional assessment and rehabilitation planning for degenerative neurologic conditions.
`2084P0800X`	Neurology	Neurologists confirm diagnoses such as ALS, MS, or Parkinson disease and direct disease-specific management.
`2085R0202X`	Physical Therapist	Provides mobility, gait, and assistive device evaluation directly tied to the documented neurologic diagnosis.
`367A0000X`	Occupational Therapy	Performs ADL-focused evaluations and adaptive equipment recommendations related to neurologic disability.
`3336C0004X`	Speech-Language Pathology	Evaluates swallowing and communication disorders commonly associated with degenerative neurologic disease.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G12.21`	Amyotrophic lateral sclerosis	Directly documents ALS as the degenerative neurologic condition supporting `G2151`.
`G35`	Multiple sclerosis	MS is a common degenerative neurologic diagnosis referenced for episode documentation.
`G20`	Parkinson disease	Parkinson disease documentation supports care planning related to motor and nonmotor symptoms during the episode.
`G31.85`	Alzheimer disease, atypical or other neurodegenerative disorders of the brain	Represents other degenerative neurologic conditions that may be relevant to episode documentation.
`G37.9`	Demyelinating disease of central nervous system, unspecified	Used when a demyelinating disorder is present but not further specified and impacts episode management.
`R53.83`	Other fatigue	Common symptom code used to describe functional limitations in degenerative neurologic disease during the episode.
`R26.9`	Unspecified abnormalities of gait and mobility	Used when gait disturbance from the neurologic condition is documented and justifies rehabilitative services.
`R13.10`	Dysphagia, unspecified	Used when swallowing dysfunction related to ALS, MS, or Parkinson disease is part of the episode of care.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99406`	Smoking and tobacco cessation counseling visit, intermediate, greater than 3 minutes up to 10 minutes	May be performed during office encounters for patients with neurologic disease where smoking cessation is part of risk modification and counseling within the episode of care.
`97110`	Therapeutic exercises to develop strength and endurance, range of motion and flexibility (each 15 minutes)	Commonly used by physical therapy to address weakness and mobility limitations in patients with degenerative neurologic conditions during the episode.
`92526`	Treatment of swallowing function, each 15 minutes	Performed by speech-language pathology when dysphagia related to ALS, MS, or Parkinson disease is present and documented during the episode.
`94664`	Demonstration and/or evaluation of patient utilization of an inhaler or nebulizer	Used when respiratory therapy interventions are provided for patients with neuromuscular respiratory involvement during the episode.
`99304`	Initial nursing facility care, per day, for the evaluation and management of a patient	Applies when the patient with a documented degenerative neurologic condition is admitted to a skilled nursing facility and requires initial comprehensive assessment tied to the episode.

OpenPayer