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CPT 95857: Edrophonium (Tensilon) Test for Myasthenia Gravis

CPT code 95857 designates an intravenous edrophonium (Tensilon) or other cholinesterase inhibitor test used to support the clinical diagnosis of myasthenia gravis by demonstrating transient improvement in muscle strength. The procedure is a focused diagnostic pharmacologic test performed in outpatient or hospital outpatient settings and has relevance for neurologists, emergency clinicians, and diagnostic service lines. Nationally, accurate coding of this test affects diagnostic pathways for patients with suspected neuromuscular junction disorders and informs utilization and coverage discussions.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code and clinical context, typical sites of service, common modifiers and billing considerations (listed separately), and what to expect in terms of documentation and coding descriptors. The publication also highlights benchmarks and policy updates where available and summarizes the role of the test within diagnostic workflows for myasthenia gravis. Data not available in the input for some payer-specific coverage details and associated taxonomies is noted elsewhere in the full publication.

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Billing Code Overview

CPT code 95857 describes an intravenous cholinesterase inhibitor test used to evaluate patients suspected of having myasthenia gravis, a neuromuscular disorder characterized by fluctuating muscle weakness and fatigue. During this diagnostic procedure, a provider injects edrophonium (Tensilon) or another cholinesterase inhibitor into a peripheral vein while observing for a transient clinical improvement in muscle strength.

Service type: Diagnostic pharmacologic test

Typical site of service: Outpatient clinic or hospital outpatient department, including neurology clinics or specialized diagnostic centers.

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CPT 95857: Edrophonium (Tensilon) Test for Myasthenia Gravis

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Billing Code Overview

Service type: Diagnostic pharmacologic test

Typical site of service: Outpatient clinic or hospital outpatient department, including neurology clinics or specialized diagnostic centers.

Clinical & Coding Specifications

Clinical Context

A patient in their 30s presents to the neurology clinic with fluctuating ptosis, diplopia, and proximal muscle weakness that worsens with exertion and improves with rest. The neurologist suspects myasthenia gravis and schedules an edrophonium (Tensilon) test to support the diagnosis. The procedure is performed in an outpatient clinic or hospital-based neurology procedure room with cardiac monitoring and resuscitation equipment available. Baseline vital signs and a focused neuromuscular exam are documented. An intravenous line is placed and small incremental doses of edrophonium are administered while the provider observes for rapid, transient improvement of muscle strength or resolution of ocular symptoms. Anticholinergic reversal (atropine) is prepared and available. Results of the test are documented in the chart, including pre- and post-injection exam findings, doses administered, and any adverse effects. This service may also be performed during an urgent evaluation in the emergency department if new or severe symptoms prompt immediate diagnostic testing.

Coding Specifications

Modifier	Description	When to Use
`11`	Normal or routine service	Use when this procedure is part of the physician’s typical service during the encounter and no unusual circumstances apply.
`22`	Increased procedural services	Use if substantially greater work is documented due to complexity (e.g., difficult IV access, prolonged monitoring for adverse reaction) beyond typical expectations.
`23`	Unusual anesthesia	Not commonly used for this test but applicable if unusual anesthesia is required for the procedure.
`26`	Professional component	Use when billing only the physician’s interpretation/clinical component and the technical component is billed separately.
`52`	Reduced services	Use when the test is started but discontinued and a reduced service is rendered (e.g., aborted due to adverse reaction).
`53`	Discontinued procedure	Use when the procedure is terminated due to patient instability or adverse event that prevents completion.
`78`	Return to the operating/procedure room for a related procedure during the postoperative period	Rare for this procedure; use only if a related return is required for a complication.
`80`	Assistant surgeon present	Not typically applicable; listed if an assistant is documented and required.
`62`	Two surgeons	Rare; applicable only when two surgeons are documented as necessary.
`51`	Multiple procedures	Use when this test is reported in the same session with other distinct reimbursable procedures.
`26`	Professional component	Use when splitting technical and professional components between providers or entities.
`59`	Distinct procedural service	Use when billing a separate, distinct procedure in the same session (note: `59` is not in the provided modifier list; therefore it is omitted).

Taxonomy Code	Specialty	Notes
2084P0800X	Neurology	Neurologists commonly perform diagnostic testing for neuromuscular disease, including edrophonium testing.
2084N0400X	Neuromuscular Medicine	Subspecialists focused on neuromuscular disorders frequently perform and interpret this test.
208D00000X	Emergency Medicine	ED physicians may perform the test when evaluating acute neuromuscular presentations.
208000000X	Internal Medicine	General internists or hospitalists may coordinate testing in inpatient settings.
261QP2300X	Clinical Neurophysiology	Providers in this specialty may be involved in testing and interpretation related to neuromuscular diagnosis.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G70.00`	Myasthenia gravis without (acute) exacerbation	Primary indication for edrophonium testing to support diagnosis when clinical features are suggestive.
`G70.01`	Myasthenia gravis with (acute) exacerbation	ED or inpatient testing may be performed when symptoms worsen acutely and diagnostic clarification is needed.
`G70.10`	Lambert-Eaton myasthenic syndrome	Considered in the differential diagnosis of neuromuscular weakness; edrophonium testing may help differentiate disorders.
`R29.811`	Generalized muscle weakness	Symptom code prompting diagnostic testing including edrophonium challenge when MG is suspected.
`H53.2`	Diplopia	Common ocular symptom leading to edrophonium testing to assess for transient improvement.
`H02.40`	Ptosis, unspecified	Ptosis is a frequent presenting sign in ocular myasthenia and an indication for edrophonium testing.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`96372`	Therapeutic, prophylactic, or diagnostic injection (specify substance or drug); subcutaneous or intramuscular	May be used for administration of related medications in clinic if edrophonium is not administered intravenously or for adjunct injections; not a direct substitute for IV edrophonium testing.
`36415`	Collection of venous blood by venipuncture	Often performed for baseline laboratory tests (e.g., ACh receptor antibodies, CBC) before or after the edrophonium test.
`93000`	Electrocardiogram, routine EKG with at least 12 leads; with interpretation and report	Performed before or during testing for cardiac monitoring and to document baseline rhythm if clinically indicated.
`95004`	Percutaneous tests and desensitization; intradermal tests, immediate type (e.g., skin testing for drug allergy)	Not routine but may be used if concern for drug allergy to testing agents exists and allergy testing is required.
`99213`	Office or other outpatient visit, established patient, low to moderate complexity	Typical evaluation and management code for the pre- and post-test physician encounter in an outpatient setting.

CPT 95836: Electrocorticogram Analysis from Implanted Neurostimulator

CPT-95851-RANGE-OF-MOTION-MEASUREMENT-SPINE-OR-EXTREMITY

CPT 95851: Range of Motion Measurement for Spine or Extremity

CPT-95852-HAND-RANGE-OF-MOTION-MEASUREMENT

CPT 95852: Hand Range of Motion Measurement

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`11`	Normal or routine service	Use when this procedure is part of the physician’s typical service during the encounter and no unusual circumstances apply.
`22`	Increased procedural services	Use if substantially greater work is documented due to complexity (e.g., difficult IV access, prolonged monitoring for adverse reaction) beyond typical expectations.
`23`	Unusual anesthesia	Not commonly used for this test but applicable if unusual anesthesia is required for the procedure.
`26`	Professional component	Use when billing only the physician’s interpretation/clinical component and the technical component is billed separately.
`52`	Reduced services	Use when the test is started but discontinued and a reduced service is rendered (e.g., aborted due to adverse reaction).
`53`	Discontinued procedure	Use when the procedure is terminated due to patient instability or adverse event that prevents completion.
`78`	Return to the operating/procedure room for a related procedure during the postoperative period	Rare for this procedure; use only if a related return is required for a complication.
`80`	Assistant surgeon present	Not typically applicable; listed if an assistant is documented and required.
`62`	Two surgeons	Rare; applicable only when two surgeons are documented as necessary.
`51`	Multiple procedures	Use when this test is reported in the same session with other distinct reimbursable procedures.
`26`	Professional component	Use when splitting technical and professional components between providers or entities.
`59`	Distinct procedural service	Use when billing a separate, distinct procedure in the same session (note: `59` is not in the provided modifier list; therefore it is omitted).

Taxonomy Code	Specialty	Notes
2084P0800X	Neurology	Neurologists commonly perform diagnostic testing for neuromuscular disease, including edrophonium testing.
2084N0400X	Neuromuscular Medicine	Subspecialists focused on neuromuscular disorders frequently perform and interpret this test.
208D00000X	Emergency Medicine	ED physicians may perform the test when evaluating acute neuromuscular presentations.
208000000X	Internal Medicine	General internists or hospitalists may coordinate testing in inpatient settings.
261QP2300X	Clinical Neurophysiology	Providers in this specialty may be involved in testing and interpretation related to neuromuscular diagnosis.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G70.00`	Myasthenia gravis without (acute) exacerbation	Primary indication for edrophonium testing to support diagnosis when clinical features are suggestive.
`G70.01`	Myasthenia gravis with (acute) exacerbation	ED or inpatient testing may be performed when symptoms worsen acutely and diagnostic clarification is needed.
`G70.10`	Lambert-Eaton myasthenic syndrome	Considered in the differential diagnosis of neuromuscular weakness; edrophonium testing may help differentiate disorders.
`R29.811`	Generalized muscle weakness	Symptom code prompting diagnostic testing including edrophonium challenge when MG is suspected.
`H53.2`	Diplopia	Common ocular symptom leading to edrophonium testing to assess for transient improvement.
`H02.40`	Ptosis, unspecified	Ptosis is a frequent presenting sign in ocular myasthenia and an indication for edrophonium testing.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`96372`	Therapeutic, prophylactic, or diagnostic injection (specify substance or drug); subcutaneous or intramuscular	May be used for administration of related medications in clinic if edrophonium is not administered intravenously or for adjunct injections; not a direct substitute for IV edrophonium testing.
`36415`	Collection of venous blood by venipuncture	Often performed for baseline laboratory tests (e.g., ACh receptor antibodies, CBC) before or after the edrophonium test.
`93000`	Electrocardiogram, routine EKG with at least 12 leads; with interpretation and report	Performed before or during testing for cardiac monitoring and to document baseline rhythm if clinically indicated.
`95004`	Percutaneous tests and desensitization; intradermal tests, immediate type (e.g., skin testing for drug allergy)	Not routine but may be used if concern for drug allergy to testing agents exists and allergy testing is required.
`99213`	Office or other outpatient visit, established patient, low to moderate complexity	Typical evaluation and management code for the pre- and post-test physician encounter in an outpatient setting.

CPT 95836: Electrocorticogram Analysis from Implanted Neurostimulator

CPT-95851-RANGE-OF-MOTION-MEASUREMENT-SPINE-OR-EXTREMITY

CPT 95851: Range of Motion Measurement for Spine or Extremity

CPT-95852-HAND-RANGE-OF-MOTION-MEASUREMENT

CPT 95852: Hand Range of Motion Measurement

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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CPT 95857: Edrophonium (Tensilon) Test for Myasthenia Gravis

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Billing Code Overview

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CPT 95857: Edrophonium (Tensilon) Test for Myasthenia Gravis

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References