Summary & Overview
CPT 95872: Single-Fiber Electromyography (SFEMG)
CPT code 95872 represents single-fiber electromyography (SFEMG), a specialized electrodiagnostic procedure that records electrical activity from individual muscle fibers to assess neuromuscular transmission by measuring jitter, blocking, and fiber density. SFEMG is clinically important for diagnosing conditions such as myasthenia gravis and other disorders of the neuromuscular junction and motor unit, and it plays a role in guiding treatment decisions and specialist referrals nationwide.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, typical sites of service, and common billing considerations. The publication summarizes benchmarking information where available, highlights relevant policy and coverage themes affecting access to SFEMG, and outlines documentation and coding points that influence claim acceptance and reimbursement workflows.
This report is written for a national audience of clinicians, practice managers, and billing professionals seeking a clear, policy-aware explanation of CPT code 95872, its clinical purpose, payer coverage landscape, and operational implications for delivering and billing specialized electrodiagnostic testing.
Billing Code Overview
CPT code 95872 describes a single-fiber electromyography (SFEMG) procedure in which a provider records and studies the electrical activity of individual muscle fibers using a specialized single-fiber needle electrode. The examination measures parameters such as jitter, blocking, and fiber density to identify electrical activity from individual muscle fibers and evaluate neuromuscular transmission.
Service Type: Diagnostic electrodiagnostic testing — single-fiber EMG
Typical Site of Service: Hospital outpatient department, ambulatory surgical center, or specialized neurodiagnostic laboratory
Clinical & Coding Specifications
Clinical Context
A patient in their mid-50s presents to an outpatient neuromuscular clinic with progressive fatigable weakness, ptosis, and intermittent diplopia over several months. The referring neurologist suspects a neuromuscular junction disorder such as myasthenia gravis or a motor endplate disorder after bedside exam and positive fatigue testing. Prior to initiating immunotherapy, the clinician schedules a specialized electrophysiologic study: single-fiber electromyography using 95872 to measure jitter, blocking, and fiber density in selected clinical muscles (e.g., orbicularis oculi, frontalis, extensor digitorum).
Pre-procedure workflow includes review of medication list (holding acetylcholinesterase inhibitors per local protocol), focused neurologic exam, informed consent, and explanation of discomfort and small-needle risks. The procedure is performed in an outpatient electromyography laboratory or neurology clinic with continuous monitoring of patient comfort. The provider inserts a single-fiber needle electrode into target muscles, records trains of action potentials, and measures jitter and blocking across multiple sites per muscle. Findings are documented in the procedure note with numeric jitter values, presence/absence of blocking, and interpretation (normal, increased jitter, neuromuscular transmission defect). Results are used to confirm the diagnosis, guide additional testing (e.g., repetitive nerve stimulation, serologic testing), and inform treatment planning such as initiation of pyridostigmine or immunomodulatory therapy.
Coding Specifications
| Modifier | Description | When to Use |
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