Summary & Overview
HCPCS G8405: Lower Extremity Neurological Exam Not Performed
HCPCS Level II code G8405 denotes that a lower extremity neurological exam was not performed during a clinical encounter. This code captures an absence of a specific documented component of the physical examination and is used in medical records to reflect that the lower extremity neurological assessment was not completed. Nationally, such codes matter for clinical documentation integrity, quality measurement, and billing audits because they clarify whether expected exam components were performed and documented.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the code’s clinical meaning, typical sites of service, and how payers commonly address documentation of omitted exam components. The publication outlines common modifiers associated with documentation scenarios, the role of the code in quality and compliance workflows, and guidance on interpretation for coding and billing teams.
The content provides benchmarks and policy context where available, explains implications for claims processing and medical record reviews, and summarizes common practice patterns related to documenting omitted lower extremity neurological exams. Data not available in the input is noted where applicable.
Billing Code Overview
HCPCS Level II code G8405 indicates lower extremity neurological exam not performed. This code is used to document that a documented neurological examination of the lower extremity was not completed during an encounter.
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Service type: Clinical examination documentation
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Typical site of service: Outpatient clinic or office-based clinical encounter
Clinical & Coding Specifications
Clinical Context
A 68-year-old male presents to a vascular surgery clinic for evaluation after a nonhealing ulcer on the lateral aspect of the left ankle. The clinician documents limited mobility due to diabetic peripheral neuropathy and plans an ankle–brachial index and arterial duplex. During the physical exam, the clinician intends to perform a lower extremity neurological exam but is unable to complete it due to patient factors: the patient is unable to follow commands because of acute delirium, and he is noncooperative with testing due to severe pain. The clinician documents the reason the lower extremity neurological exam was not performed and codes the encounter with G8405 to indicate the exam was not completed.
Clinical workflow:
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Initial intake and problem-focused history are obtained by nursing, including pain and sensory complaints.
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The physician or qualified practitioner reviews prior records and performs the planned vascular assessment.
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The practitioner attempts a focused lower extremity neurological exam (strength, sensation, reflexes) but documents inability to perform the exam and the clinical reason (e.g., altered mental status, severe pain, immobility).
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The clinician documents alternatives performed (motor inspection, assessment of perfusion, bedside monofilament if tolerated) and codes
G8405to indicate the lower extremity neurologic exam was not performed. -
Billing staff appends appropriate modifiers and links to the primary diagnosis and procedure codes for the visit.