HCPCS Level II A4544: Electrode for External Lower Extremity Nerve Stimulator

HCPCS Level II code A4544 identifies an electrode for an external lower extremity nerve stimulator used to treat symptoms of restless legs syndrome; this durable medical equipment item is supplied as part of a neuromodulation therapy service for ambulatory or outpatient use on the lower leg or foot, with the typical site of service being physician offices, outpatient clinics, and durable medical equipment suppliers that provide external neurostimulation devices.

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HCPCS Level II A4544: Electrode for External Lower Extremity Nerve Stimulator

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Get alerted when payer policies referencing A4544 are released or updated.

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Receive email alerts as soon as relevant payer policies are published or updated.

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult presenting with worsening symptoms of restless legs syndrome (RLS) characterized by an uncontrollable urge to move the legs, often accompanied by paresthesia and nocturnal exacerbation that interferes with sleep and daily function. The patient has tried first-line medical therapy (iron repletion when indicated, dopaminergic agents, gabapentin/pregabalin) with incomplete response or intolerable side effects. A neurology or sleep medicine specialist evaluates the patient in an outpatient clinic and determines that adjunctive external lower extremity nerve stimulation may provide symptomatic relief.

The clinical workflow: the clinician documents RLS severity, prior therapies, and rationale for neuromodulation. The clinic supplies or fits the patient with one or more external electrodes (A4544) placed on the lower legs near target peripheral nerves (e.g., superficial peroneal, saphenous or tibial distributions) connected to an external nerve stimulator. Device education includes electrode placement, skin prep, stimulation parameters, safety, and home use instructions. Follow-up visits assess symptom reduction, skin integrity at electrode sites, device tolerance, and need for replacement electrodes or device reprogramming. Typical sites of service are outpatient neurology or sleep clinic, durable medical equipment (DME) supplier visits, and home use by the patient.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95970`	Electronic analysis of implanted neurostimulator pulse generator system; simple or single array lead(s) or peripheral nerve unit(s)	Used when performing programming or device interrogation for an implanted or external neurostimulator system supporting electrode use
`95971`	Electronic analysis of implanted neurostimulator pulse generator system; complex or multiple array lead(s) or peripheral nerve unit(s)	Applicable for more complex device evaluations or multi-lead peripheral stimulation setups
`97012`	Mechanical traction	May be used in physical therapy encounters addressing lower extremity conditions adjunctive to neuromodulation (note: selection depends on payer policy)
`97760`	Orthotic/prosthetic management and training, initial encounter	Used when DME supplier or therapist provides training on use of external stimulation devices and electrode application
`99070`	Supplies and materials (except spectacles), provided by the physician over and above those usually included with the office visit	Used to bill for single-use supplies or electrode consumables when payer allows separate supply charges

Related Modifiers

6 rows

Modifier	Description	When to Use
22	Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…	- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
52	Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…	- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
53	Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…	- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
62	Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…	- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
78	CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…	- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
80	CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…	- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207RH0000X	Hematology (Internal Medicine) Physician	An internist with additional training who specializes in diseases of the blood, spleen and lymph. This specialist treats conditions such as anemia, cl…
207P00000X	Emergency Medicine Physician	An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospit…
164W00000X	Licensed Practical Nurse	An individual with post-high school vocational training and practical experience in the provision of nursing care at a level less than that required f…
2085R0204X	Vascular & Interventional Radiology Physician	A radiologist who diagnoses and treats diseases by various radiologic imaging modalities. These include fluoroscopy, digital radiography, computed tom…
251C00000X	Developmentally Disabled Services Day Training Agency	These agencies are authorized to provide day habilitation services to developmentally disabled individuals who live in their homes. The function of d…
363LP2300X	Primary Care Nurse Practitioner	Physician Assistants & Advanced Practice Nursing Providers · Nurse Practitioner
2471C3402X	Radiography Radiologic Technologist	A radiologic technologist who specializes in radiography (also known as x-rays) and is appropriately educated and trained, consistent with nationally …
3336S0011X	Specialty Pharmacy	A pharmacy that dispenses generally low volume and high cost medicinal preparations to patients who are undergoing intensive therapies for illnesses t…

Related ICD-10-CM Codes

2 rows

ICD-10-CM Code	Description
G25.81	Restless legs syndrome
G47.33	Obstructive sleep apnea (adult) (pediatric)

Related Codes

HCPCS-A4206-STERILE-SYRINGE-1CC-NEEDLE

HCPCS A4206: Syringe with Needle, 1 cc or Less, Sterile

HCPCS-A4207-STERILE-2CC-SYRINGE-WITH-NEEDLE

HCPCS Level II A4207: Syringe with Needle, Sterile 2 cc

HCPCS-A4208-STERILE-3CC-SYRINGE-WITH-NEEDLE

HCPCS Level II A4208: Syringe with Needle, Sterile 3 cc

HCPCS-A4209-STERILE-SYRINGE-WITH-NEEDLE-5CC-OR-GREATER

HCPCS Level II A4209: Syringe with Needle, Sterile 5 cc or Greater

HCPCS-A4210-NEEDLE-FREE-INJECTION-DEVICE

HCPCS Level II A4210: Needle-free Injection Device, Each

HCPCS-A4211-SUPPLIES-SELF-ADMINISTERED-INJECTIONS

HCPCS Level II A4211: Supplies for Self-Administered Injections

HCPCS-A4212-NON-CORING-NEEDLE-STYLET-CATHETER-ACCESS-SUPPLY

HCPCS Level II A4212: Non-coring Needle or Stylet with/without Catheter

HCPCS-A4213-STERILE-SYRINGE-20CC-OR-GREATER

HCPCS Level II A4213: Syringe, Sterile, 20 cc or Greater, Each

HCPCS-A4215-STERILE-NEEDLE-SINGLE-EACH

HCPCS Level II A4215: Needle, Sterile, Any Size

HCPCS-A4216-STERILE-DILUENT-FLUSH-10ML

HCPCS Level II A4216: Sterile Diluent/Flush, 10 ml

Showing 1–10 of 633

Frequently Asked Questions

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

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95970`	Electronic analysis of implanted neurostimulator pulse generator system; simple or single array lead(s) or peripheral nerve unit(s)	Used when performing programming or device interrogation for an implanted or external neurostimulator system supporting electrode use
`95971`	Electronic analysis of implanted neurostimulator pulse generator system; complex or multiple array lead(s) or peripheral nerve unit(s)	Applicable for more complex device evaluations or multi-lead peripheral stimulation setups
`97012`	Mechanical traction	May be used in physical therapy encounters addressing lower extremity conditions adjunctive to neuromodulation (note: selection depends on payer policy)
`97760`	Orthotic/prosthetic management and training, initial encounter	Used when DME supplier or therapist provides training on use of external stimulation devices and electrode application
`99070`	Supplies and materials (except spectacles), provided by the physician over and above those usually included with the office visit	Used to bill for single-use supplies or electrode consumables when payer allows separate supply charges

Related Modifiers

6 rows

Modifier	Description	When to Use
22	Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…	- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
52	Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…	- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
53	Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…	- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
62	Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…	- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
78	CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…	- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
80	CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…	- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207RH0000X	Hematology (Internal Medicine) Physician	An internist with additional training who specializes in diseases of the blood, spleen and lymph. This specialist treats conditions such as anemia, cl…
207P00000X	Emergency Medicine Physician	An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospit…
164W00000X	Licensed Practical Nurse	An individual with post-high school vocational training and practical experience in the provision of nursing care at a level less than that required f…
2085R0204X	Vascular & Interventional Radiology Physician	A radiologist who diagnoses and treats diseases by various radiologic imaging modalities. These include fluoroscopy, digital radiography, computed tom…
251C00000X	Developmentally Disabled Services Day Training Agency	These agencies are authorized to provide day habilitation services to developmentally disabled individuals who live in their homes. The function of d…
363LP2300X	Primary Care Nurse Practitioner	Physician Assistants & Advanced Practice Nursing Providers · Nurse Practitioner
2471C3402X	Radiography Radiologic Technologist	A radiologic technologist who specializes in radiography (also known as x-rays) and is appropriately educated and trained, consistent with nationally …
3336S0011X	Specialty Pharmacy	A pharmacy that dispenses generally low volume and high cost medicinal preparations to patients who are undergoing intensive therapies for illnesses t…

Related ICD-10-CM Codes

2 rows

ICD-10-CM Code	Description
G25.81	Restless legs syndrome
G47.33	Obstructive sleep apnea (adult) (pediatric)

Related Codes

HCPCS-A4206-STERILE-SYRINGE-1CC-NEEDLE

HCPCS A4206: Syringe with Needle, 1 cc or Less, Sterile

HCPCS-A4207-STERILE-2CC-SYRINGE-WITH-NEEDLE

HCPCS Level II A4207: Syringe with Needle, Sterile 2 cc

HCPCS-A4208-STERILE-3CC-SYRINGE-WITH-NEEDLE

HCPCS Level II A4208: Syringe with Needle, Sterile 3 cc

HCPCS-A4209-STERILE-SYRINGE-WITH-NEEDLE-5CC-OR-GREATER

HCPCS Level II A4209: Syringe with Needle, Sterile 5 cc or Greater

HCPCS-A4210-NEEDLE-FREE-INJECTION-DEVICE

HCPCS Level II A4210: Needle-free Injection Device, Each

HCPCS-A4211-SUPPLIES-SELF-ADMINISTERED-INJECTIONS

HCPCS Level II A4211: Supplies for Self-Administered Injections

HCPCS-A4212-NON-CORING-NEEDLE-STYLET-CATHETER-ACCESS-SUPPLY

HCPCS Level II A4212: Non-coring Needle or Stylet with/without Catheter

HCPCS-A4213-STERILE-SYRINGE-20CC-OR-GREATER

HCPCS Level II A4213: Syringe, Sterile, 20 cc or Greater, Each

HCPCS-A4215-STERILE-NEEDLE-SINGLE-EACH

HCPCS Level II A4215: Needle, Sterile, Any Size

HCPCS-A4216-STERILE-DILUENT-FLUSH-10ML

HCPCS Level II A4216: Sterile Diluent/Flush, 10 ml

Showing 1–10 of 633

Frequently Asked Questions

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.

Published by

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

HCPCS Level II A4544: Electrode for External Lower Extremity Nerve Stimulator

Sign up for hcpcs A4544 policy alerts

HCPCS Level II A4544: Electrode for External Lower Extremity Nerve Stimulator

Sign up for hcpcs A4544 policy alerts

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related ICD-10-CM Codes

Related Codes

What does HCPCS code A4544 represent and where is it typically used?

What clinical documentation elements are important when billing for A4544?

Which modifiers are relevant when billing for A4544 and when are they used?

Which specialties and sites of service commonly handle billing or clinical use of A4544?

What related CPT and diagnosis codes are listed alongside A4544?

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related ICD-10-CM Codes

Related Codes

What does HCPCS code A4544 represent and where is it typically used?

What clinical documentation elements are important when billing for A4544?

Which modifiers are relevant when billing for A4544 and when are they used?

Which specialties and sites of service commonly handle billing or clinical use of A4544?

What related CPT and diagnosis codes are listed alongside A4544?

References