Summary & Overview
HCPCS G8404: Lower Extremity Neurological Exam Performed and Documented
HCPCS Level II code G8404 denotes a documented lower extremity neurological examination. This code captures clinical work involving sensory, motor, reflex, and coordination testing of the legs and feet and is used to record that the exam was performed and documented in the medical record. Nationally, standardized capture of such exams supports clinical quality measurement, care coordination, and billing clarity for services related to neurologic and musculoskeletal conditions.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise breakdown of what the code represents, typical settings where the service is delivered, and the operational context for billing this service. The publication also summarizes common modifiers and how they are documented in claims, references typical associated taxonomies where available, and notes common documentation requirements.
The piece is intended to help coding, billing, and compliance teams understand the clinical context for G8404, how payers commonly treat and recognize the service, and what benchmarks and policy updates to watch. Data not available in the input is noted where relevant.
Billing Code Overview
HCPCS Level II code G8404 indicates a lower extremity neurological exam performed and documented. This service represents a focused neurological assessment of the lower limbs, including testing of sensory function, motor strength, reflexes, and coordination as documented in the patient record.
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Service type: Neurological diagnostic/assessment service
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Typical site of service: Outpatient clinic, physician office, or other ambulatory settings where neurological examinations are performed
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient presents to an outpatient neurology clinic with progressive numbness and paresthesia in the lower extremities and occasional gait instability over several months. The clinician performs a focused lower extremity neurological examination to document motor strength, deep tendon reflexes, sensory modalities (light touch, pinprick, vibration, proprioception), coordination (heel‑to‑shin), gait assessment, and any signs of radiculopathy or peripheral neuropathy. Findings are documented in the medical record, including side(s) examined, specific muscles tested (graded 0–5), reflex responses (0–4+), sensory level or distribution, and any abnormal patterns (e.g., stocking‑glove neuropathy or L5 radiculopathy). The workflow typically includes review of history and prior studies, focused physical exam including the lower extremity neuro exam coded as G8404, possible ordering of electrodiagnostic testing or imaging, and documentation of clinical decision making for ongoing management. Typical sites of service are outpatient clinic (neurology, physiatry, primary care) or inpatient bedside exam when neurological monitoring is required.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the lower extremity neuro exam requires substantially more work or documentation than usual due to complexity. |