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CPT 51785: Electromyography of Anal or Urethral Sphincter

CPT code 51785 is used for electromyographic measurement of the anal or urethral sphincter muscles, a diagnostic neuromuscular study that informs evaluation of pelvic floor and sphincter function. Nationally, this service is important for diagnosing causes of urinary retention, fecal incontinence, neuropathic pelvic floor disorders, and for guiding management decisions that may include surgical, behavioral, or device-based interventions. The code supports billing for specialized diagnostic testing performed in outpatient specialty clinics and hospital-based electrodiagnostic laboratories.

Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of billing and clinical context for CPT code 51785, typical sites of service, common modifiers and billing considerations (Data not available in the input for payer-specific rates), and related clinical scenarios where the study is frequently used. The publication summarizes benchmarks where available and highlights policy and coverage considerations relevant to this diagnostic procedure. The content is intended to help billing professionals, clinicians, and policy analysts understand the clinical role and coding context of CPT code 51785 at a national level.

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Billing Code Overview

CPT code 51785 measures the electrical activity of the anal or urethral sphincter muscles through electromyographic testing. This service evaluates neuromuscular function of the pelvic floor and sphincter mechanisms to assist clinical assessment of voiding dysfunction, fecal incontinence, neuromuscular injury, or neuropathic conditions affecting sphincter control.

Service type: Diagnostic neuromuscular study (electromyography)

Typical site of service: Urology clinic, colorectal clinic, pelvic floor specialty clinic, or hospital outpatient electrodiagnostic lab

Find policies, billing codes, payers, states, and providers

CPT 51785: Electromyography of Anal or Urethral Sphincter

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Billing Code Overview

Service type: Diagnostic neuromuscular study (electromyography)

Typical site of service: Urology clinic, colorectal clinic, pelvic floor specialty clinic, or hospital outpatient electrodiagnostic lab

Clinical & Coding Specifications

Clinical Context

A typical patient is a 58-year-old female referred to a urogynecology or colorectal motility clinic for evaluation of fecal incontinence and reported leakage with urgency. Prior conservative therapies (dietary modification, pelvic floor physical therapy, and topical agents) have not resolved symptoms. The clinician orders 51785 (anal or urethral sphincter electromyography) to assess neuromuscular function of the external anal sphincter and pelvic floor or the urethral sphincter complex. The procedure is performed in an outpatient electrodiagnostic laboratory or ambulatory surgery center. The workflow includes informed consent, focused history and targeted neurologic exam, positioning (left lateral decubitus for anal testing or lithotomy for urethral testing), skin preparation, placement of concentric needle electrodes into the sphincter(s), recording of spontaneous activity and voluntary motor unit potential recruitment, and interpretation by a physician credentialed in electromyography. Results guide diagnosis of pudendal neuropathy, sphincter denervation, motor unit recruitment disorders, or neuromuscular junction abnormalities and inform subsequent management such as sacral neuromodulation candidacy, pelvic floor therapy adjustments, or referral to neurology or colorectal surgery. Typical documentation includes indication, informed consent, sites tested, electrode type, findings (spontaneous activity, recruitment patterns, motor unit potentials), comparison to normative values if available, and a signed interpretive report.

Coding Specifications

Modifier table

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician interpretation/report for the EMG separate from technical components provided by the facility or technician
`TC`	Technical component	Use when billing only the facility/technical portion (equipment, supplies, technologist) and not the physician interpretation
`59`	Distinct procedural service	Use when `51785` is performed on a separate anatomic site or on a distinctly separate encounter from another procedure that would typically be bundled
`52`	Reduced services	Use when the EMG procedure is partially reduced or not completed as planned (documentation must support reason)
`53`	Discontinued procedure	Use when the procedure is started but terminated due to patient instability or other documented reasons before completion
`76`* (not in provided list)	Data not available in the input	Data not available in the input
`QK`	Medical direction of two, three, or four assistants	Use when physician directs multiple qualified medical personnel during the procedure and the billing rules for assistant services apply
`QX`	Modifier for assistant-at-surgery certification (when applicable)	Use when the assistant documentation supports the assistant’s presence per payer rules
`63`	Procedure performed on infants less than 4 kg	Use when applicable in neonatal patients where weight-specific modifier is required by payers
`LT`	Left side	Use when the procedure is performed on the left sphincter side and laterality reporting is required by payer
`RT`* (not in provided list)	Data not available in the input	Data not available in the input
`59`	Distinct procedural service	Use when the EMG is distinct/separate from other procedures performed the same day

Provider taxonomy table

Taxonomy Code	Specialty	Notes
207RH0000X	Physical Medicine & Rehabilitation	Clinicians in PM&R frequently perform and interpret pelvic floor EMG and neuromuscular testing
207RH00000X	Neurology	Neurologists perform EMG for diagnostic evaluation of pudendal neuropathy and sphincter denervation
207VP0000X	Urology	Urologists evaluate urinary sphincter dysfunction and may perform urethral sphincter EMG
207L00000X	Colon & Rectal Surgery	Colorectal surgeons manage fecal incontinence and collaborate in interpretation and management
261QM0800X	Physical Therapist	Pelvic floor physical therapists work closely with ordering clinicians though they do not interpret diagnostic EMG

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
Data not available in the input	Data not available in the input	Data not available in the input

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`51784`	Electromyography, anal sphincter; needle	Performed when needle EMG is targeted specifically to the anal sphincter; may be coded when testing is limited or unilateral compared with `51785`
`51786`	Electromyography, urethral sphincter; needle	Closely related for primary evaluation of the urethral sphincter; may be performed alongside `51785` when both anal and urethral sphincters are assessed
`51701`	Biofeedback training, perineal muscles, 1 hour	Often follows EMG testing as a therapeutic intervention when muscle recruitment deficits are identified
`95905`	Short-latency somatosensory evoked potential study; upper/lower limbs	May be performed in a broader neuromuscular workup to assess conduction pathways when neuropathy is suspected
`99070`	Supplies and materials, noncovered, used during the procedure	Used for billing of special disposable supplies (needles, electrodes) if payer allows separate supply charges

CPT 51725: Cystometrogram — Bladder Pressure and Capacity Test

CPT-51726-CYSTOMETRY-BLADDER-PRESSURE-TESTING

CPT 51726: Cystometry for Bladder Capacity and Pressure Measurement

CPT-51727-COMPLEX-CYSTOMETROGRAM-URETHRAL-PRESSURE-PROFILE

CPT 51727: Complex Cystometrogram with Urethral Pressure Profile

CPT-51728-COMPLEX-CYSTOMETROGRAM-VOIDING-PRESSURE-STUDIES

CPT 51728: Complex Cystometrogram with Voiding Pressure Studies

CPT-51729-COMPLEX-CYSTOMETROGRAM-VOIDING-URETHRAL-PRESSURE-PROFILE

CPT 51729: Complex Cystometrogram with Voiding and Urethral Pressure Studies

CPT-51736-UROFLOWMETRY-URODYNAMIC-FLOW-STUDY

CPT 51736: Uroflowmetry (Urodynamic Flow Study)

CPT-51741-UROFLOWMETRY-URINARY-FLOW-MEASUREMENT

CPT 51741: Uroflowmetry (Urinary Flow Measurement)

CPT-51784-ANAL-OR-URETHRAL-SPHINCTER-ELECTRICAL-ACTIVITY-TESTING

CPT 51784: Anal or Urethral Sphincter Electrical Activity Testing

CPT-51792-SPHINCTER-ELECTROMYOGRAPHY-ANAL-URETHRAL

CPT 51792: Electromyography of Anal or Urethral Sphincter Muscles

CPT-51797-VOIDING-PRESSURE-URODYNAMIC-TEST

CPT 51797: Voiding Pressure (Urodynamic) Measurement

Showing 1–10 of 11

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier table

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the physician interpretation/report for the EMG separate from technical components provided by the facility or technician
`TC`	Technical component	Use when billing only the facility/technical portion (equipment, supplies, technologist) and not the physician interpretation
`59`	Distinct procedural service	Use when `51785` is performed on a separate anatomic site or on a distinctly separate encounter from another procedure that would typically be bundled
`52`	Reduced services	Use when the EMG procedure is partially reduced or not completed as planned (documentation must support reason)
`53`	Discontinued procedure	Use when the procedure is started but terminated due to patient instability or other documented reasons before completion
`76`* (not in provided list)	Data not available in the input	Data not available in the input
`QK`	Medical direction of two, three, or four assistants	Use when physician directs multiple qualified medical personnel during the procedure and the billing rules for assistant services apply
`QX`	Modifier for assistant-at-surgery certification (when applicable)	Use when the assistant documentation supports the assistant’s presence per payer rules
`63`	Procedure performed on infants less than 4 kg	Use when applicable in neonatal patients where weight-specific modifier is required by payers
`LT`	Left side	Use when the procedure is performed on the left sphincter side and laterality reporting is required by payer
`RT`* (not in provided list)	Data not available in the input	Data not available in the input
`59`	Distinct procedural service	Use when the EMG is distinct/separate from other procedures performed the same day

Provider taxonomy table

Taxonomy Code	Specialty	Notes
207RH0000X	Physical Medicine & Rehabilitation	Clinicians in PM&R frequently perform and interpret pelvic floor EMG and neuromuscular testing
207RH00000X	Neurology	Neurologists perform EMG for diagnostic evaluation of pudendal neuropathy and sphincter denervation
207VP0000X	Urology	Urologists evaluate urinary sphincter dysfunction and may perform urethral sphincter EMG
207L00000X	Colon & Rectal Surgery	Colorectal surgeons manage fecal incontinence and collaborate in interpretation and management
261QM0800X	Physical Therapist	Pelvic floor physical therapists work closely with ordering clinicians though they do not interpret diagnostic EMG

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
Data not available in the input	Data not available in the input	Data not available in the input

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`51784`	Electromyography, anal sphincter; needle	Performed when needle EMG is targeted specifically to the anal sphincter; may be coded when testing is limited or unilateral compared with `51785`
`51786`	Electromyography, urethral sphincter; needle	Closely related for primary evaluation of the urethral sphincter; may be performed alongside `51785` when both anal and urethral sphincters are assessed
`51701`	Biofeedback training, perineal muscles, 1 hour	Often follows EMG testing as a therapeutic intervention when muscle recruitment deficits are identified
`95905`	Short-latency somatosensory evoked potential study; upper/lower limbs	May be performed in a broader neuromuscular workup to assess conduction pathways when neuropathy is suspected
`99070`	Supplies and materials, noncovered, used during the procedure	Used for billing of special disposable supplies (needles, electrodes) if payer allows separate supply charges

CPT 51725: Cystometrogram — Bladder Pressure and Capacity Test

CPT-51726-CYSTOMETRY-BLADDER-PRESSURE-TESTING

CPT 51726: Cystometry for Bladder Capacity and Pressure Measurement

CPT-51727-COMPLEX-CYSTOMETROGRAM-URETHRAL-PRESSURE-PROFILE

CPT 51727: Complex Cystometrogram with Urethral Pressure Profile

CPT-51728-COMPLEX-CYSTOMETROGRAM-VOIDING-PRESSURE-STUDIES

CPT 51728: Complex Cystometrogram with Voiding Pressure Studies

CPT-51729-COMPLEX-CYSTOMETROGRAM-VOIDING-URETHRAL-PRESSURE-PROFILE

CPT 51729: Complex Cystometrogram with Voiding and Urethral Pressure Studies

CPT-51736-UROFLOWMETRY-URODYNAMIC-FLOW-STUDY

CPT 51736: Uroflowmetry (Urodynamic Flow Study)

CPT-51741-UROFLOWMETRY-URINARY-FLOW-MEASUREMENT

CPT 51741: Uroflowmetry (Urinary Flow Measurement)

CPT-51784-ANAL-OR-URETHRAL-SPHINCTER-ELECTRICAL-ACTIVITY-TESTING

CPT 51784: Anal or Urethral Sphincter Electrical Activity Testing

CPT-51792-SPHINCTER-ELECTROMYOGRAPHY-ANAL-URETHRAL

CPT 51792: Electromyography of Anal or Urethral Sphincter Muscles

CPT-51797-VOIDING-PRESSURE-URODYNAMIC-TEST

CPT 51797: Voiding Pressure (Urodynamic) Measurement

Showing 1–10 of 11

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

OpenPayer

CPT 51785: Electromyography of Anal or Urethral Sphincter

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Billing Code Overview

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CPT 51785: Electromyography of Anal or Urethral Sphincter

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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