HCPCS Level II L5973: Microprocessor-Controlled Ankle-Foot System

HCPCS Level II code L5973 describes an endoskeletal, microprocessor-controlled ankle-foot system that provides powered dorsiflexion and/or plantarflexion control and includes the required power source; this prosthetic device is classified as a lower-limb prosthesis service used for ambulatory mobility support and is typically provided and fitted in prosthetics and orthotics clinics or specialized outpatient rehabilitation facilities.

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HCPCS Level II L5973: Microprocessor-Controlled Ankle-Foot System

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Clinical & Coding Specifications

Clinical Context

A typical patient is a 45–70-year-old adult with significant ankle-foot instability or drop foot resulting from peripheral nerve injury, spinal cord pathology, stroke, or severe post-traumatic deformity. The patient presents to an orthopedic prosthetist and rehabilitation physician for evaluation after prior conservative measures (bracing, physical therapy) have failed to provide adequate gait stability or energy efficiency. Clinical workflow: initial evaluation by a physiatrist or prosthetist includes history, gait and functional assessment, and documentation of ambulatory limitations. Diagnostic testing may include gait laboratory analysis, casting or digitized limb measurement, and imaging to assess limb alignment and residual limb status. The microprocessor-controlled endoskeletal ankle-foot system described by L5973 is selected when dynamic dorsiflexion and/or plantar flexion control with an integrated power source is required to restore safer, more energy-efficient ambulation. Fitting and fabrication occur in a prosthetics clinic; subsequent tuning, training, and follow-up include prosthetic alignment, device calibration, and outpatient physical therapy to optimize gait. Prior authorization and medical necessity documentation typically reference functional deficit, therapeutic goals, and prior conservative care.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic management and training, initial encounter, which includes assessment, fitting and training with orthosis, upper or lower extremity(s), two or more visits	Often billed for initial prosthetic/orthotic training and gait training after fitting of a microprocessor-controlled ankle-foot system
`97763`	Orthotic/prosthetic management and training, initial encounter for subsequent encounters	Used for follow-up device adjustments and ongoing training sessions
`97750`	Physical performance test or measurement (e.g., timed walk)	Used to document functional baseline and post-fitting outcome measures to support medical necessity
`99070`	Supplies and materials (over and above those usually included with the service)	Used when additional non-routine components, batteries, or special supplies are provided with the prosthesis
`L-codes`	Data not provided — not in list	Data not available in the input.

Related Modifiers

5 rows

Modifier	Description	When to Use
81	Modifier -81 indicates a physician served as a minimal assistant surgeon for part—not all—of an operative procedure. Use when a physician’s assisting role is limited and does not represent full…	- Use CPT modifier -81 when a physician acts as a minimum assistant surgeon who assists during only part (a limited portion) of an operative procedure; append -81 to the primary surgical CPT code to…
25	CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…	- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
93	Modifier 93 denotes that a billed service was delivered synchronously via audio-only telecommunications (real-time telephone or other audio-only system). The AMA added modifier 93 in CPT Appendix A…	- When to use: Apply modifier -93 when a synchronous, real-time, two-way patient–provider encounter is conducted entirely via audio-only (telephone or other real-time interactive audio-only…
[object Object]
77	Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…	- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207L00000X	Anesthesiology Physician	An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an opera…
3336C0003X	Community/Retail Pharmacy	A pharmacy where pharmacists store, prepare, and dispense medicinal preparations and/or prescriptions for a local patient population in accordance wit…
2086S0122X	Plastic and Reconstructive Surgery Physician	A surgeon who specializes in plastic and reconstructive surgery.
163WR0006X	Registered Nurse First Assistant	A perioperative registered nurse who works in collaboration with the surgeon and other health care team members to achieve optimal outcomes. The RNFA…
163WW0000X	Wound Care Registered Nurse	Nursing Service Providers · Registered Nurse
261QR0400X	Rehabilitation Clinic/Center	Ambulatory Health Care Facilities · Clinic/Center
2865C1500X	Deactivated - Military Hospital
163WP0807X	Child & Adolescent Psychiatric/Mental Health Registered Nurse	Nursing Service Providers · Registered Nurse

HCPCS Level II L5000: Partial Foot Shoe Insert with Longitudinal Arch, Toe Filler

HCPCS-L5010-PARTIAL-FOOT-MOLDED-SOCKET-ANKLE-HEIGHT-TOE-FILLER

HCPCS L5010: Partial Foot Molded Socket, Ankle Height, With Toe Filler

HCPCS-L5020-PARTIAL-FOOT-MOLDED-SOCKET-TIBIAL-TUBERCLE-TOE-FILLER

HCPCS L5020: Partial Foot Molded Socket with Toe Filler

HCPCS-L5050-ANKLE-SYMES-MOLDED-SOCKET-SACH-FOOT

HCPCS L5050: Ankle/Symes Molded Socket with SACH Foot

HCPCS-L5060-ANKLE-SYMES-METAL-FRAME-MOLDED-LEATHER-SOCKET-ARTICULATED-ANKLE-FOOT

HCPCS L5060: Ankle/Symes Metal Frame with Molded Leather Socket

HCPCS-L5100-BELOW-KNEE-MOLDED-SOCKET-SHIN-SACH-FOOT

HCPCS Level II L5100: Below-Knee Molded Socket with Shin and SACH Foot

HCPCS-L5105-BELOW-KNEE-PLASTIC-SOCKET-SACH-FOOT

HCPCS L5105: Below-Knee Plastic Socket Prosthesis with SACH Foot

HCPCS-L5150-KNEE-DISARTICULATION-MOLDED-SOCKET-EXTERNAL-KNEE-SACH-FOOT

HCPCS L5150: Knee Disarticulation Molded Socket with External Knee and SACH Foot

HCPCS-L5160-KNEE-DISARTICULATION-MOLDED-SOCKET-BENT-KNEE-SACH-FOOT

HCPCS Level II L5160: Knee Disarticulation Molded Socket, Bent Knee Configuration

HCPCS-L5200-ABOVE-KNEE-MOLDED-SOCKET-SINGLE-AXIS-KNEE-SACH-FOOT

HCPCS Level II L5200: Above-knee Prosthesis with Molded Socket and Single-axis Knee

Showing 1–10 of 472

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
`97760`	Orthotic management and training, initial encounter, which includes assessment, fitting and training with orthosis, upper or lower extremity(s), two or more visits	Often billed for initial prosthetic/orthotic training and gait training after fitting of a microprocessor-controlled ankle-foot system
`97763`	Orthotic/prosthetic management and training, initial encounter for subsequent encounters	Used for follow-up device adjustments and ongoing training sessions
`97750`	Physical performance test or measurement (e.g., timed walk)	Used to document functional baseline and post-fitting outcome measures to support medical necessity
`99070`	Supplies and materials (over and above those usually included with the service)	Used when additional non-routine components, batteries, or special supplies are provided with the prosthesis
`L-codes`	Data not provided — not in list	Data not available in the input.

Related Modifiers

5 rows

Modifier	Description	When to Use
81	Modifier -81 indicates a physician served as a minimal assistant surgeon for part—not all—of an operative procedure. Use when a physician’s assisting role is limited and does not represent full…	- Use CPT modifier -81 when a physician acts as a minimum assistant surgeon who assists during only part (a limited portion) of an operative procedure; append -81 to the primary surgical CPT code to…
25	CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…	- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
93	Modifier 93 denotes that a billed service was delivered synchronously via audio-only telecommunications (real-time telephone or other audio-only system). The AMA added modifier 93 in CPT Appendix A…	- When to use: Apply modifier -93 when a synchronous, real-time, two-way patient–provider encounter is conducted entirely via audio-only (telephone or other real-time interactive audio-only…
[object Object]
77	Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…	- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207L00000X	Anesthesiology Physician	An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an opera…
3336C0003X	Community/Retail Pharmacy	A pharmacy where pharmacists store, prepare, and dispense medicinal preparations and/or prescriptions for a local patient population in accordance wit…
2086S0122X	Plastic and Reconstructive Surgery Physician	A surgeon who specializes in plastic and reconstructive surgery.
163WR0006X	Registered Nurse First Assistant	A perioperative registered nurse who works in collaboration with the surgeon and other health care team members to achieve optimal outcomes. The RNFA…
163WW0000X	Wound Care Registered Nurse	Nursing Service Providers · Registered Nurse
261QR0400X	Rehabilitation Clinic/Center	Ambulatory Health Care Facilities · Clinic/Center
2865C1500X	Deactivated - Military Hospital
163WP0807X	Child & Adolescent Psychiatric/Mental Health Registered Nurse	Nursing Service Providers · Registered Nurse

HCPCS Level II L5000: Partial Foot Shoe Insert with Longitudinal Arch, Toe Filler

HCPCS-L5010-PARTIAL-FOOT-MOLDED-SOCKET-ANKLE-HEIGHT-TOE-FILLER

HCPCS L5010: Partial Foot Molded Socket, Ankle Height, With Toe Filler

HCPCS-L5020-PARTIAL-FOOT-MOLDED-SOCKET-TIBIAL-TUBERCLE-TOE-FILLER

HCPCS L5020: Partial Foot Molded Socket with Toe Filler

HCPCS-L5050-ANKLE-SYMES-MOLDED-SOCKET-SACH-FOOT

HCPCS L5050: Ankle/Symes Molded Socket with SACH Foot

HCPCS-L5060-ANKLE-SYMES-METAL-FRAME-MOLDED-LEATHER-SOCKET-ARTICULATED-ANKLE-FOOT

HCPCS L5060: Ankle/Symes Metal Frame with Molded Leather Socket

HCPCS-L5100-BELOW-KNEE-MOLDED-SOCKET-SHIN-SACH-FOOT

HCPCS Level II L5100: Below-Knee Molded Socket with Shin and SACH Foot

HCPCS-L5105-BELOW-KNEE-PLASTIC-SOCKET-SACH-FOOT

HCPCS L5105: Below-Knee Plastic Socket Prosthesis with SACH Foot

HCPCS-L5150-KNEE-DISARTICULATION-MOLDED-SOCKET-EXTERNAL-KNEE-SACH-FOOT

HCPCS L5150: Knee Disarticulation Molded Socket with External Knee and SACH Foot

HCPCS-L5160-KNEE-DISARTICULATION-MOLDED-SOCKET-BENT-KNEE-SACH-FOOT

HCPCS Level II L5160: Knee Disarticulation Molded Socket, Bent Knee Configuration

HCPCS-L5200-ABOVE-KNEE-MOLDED-SOCKET-SINGLE-AXIS-KNEE-SACH-FOOT

HCPCS Level II L5200: Above-knee Prosthesis with Molded Socket and Single-axis Knee

Showing 1–10 of 472

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.

OpenPayer

HCPCS Level II L5973: Microprocessor-Controlled Ankle-Foot System

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HCPCS Level II L5973: Microprocessor-Controlled Ankle-Foot System

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Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

References

HCPCS Level II L5973: Microprocessor-Controlled Ankle-Foot System

Sign up for hcpcs L5973 policy alerts

HCPCS Level II L5973: Microprocessor-Controlled Ankle-Foot System

Sign up for hcpcs L5973 policy alerts

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

What does HCPCS L5973 represent?

Which patients and clinical workflow are described for L5973?

Which modifiers should be considered when billing L5973?

Which related CPT codes and services are often billed alongside L5973?

Which payers are included and what documentation is typically referenced for coverage of L5973?

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

What does HCPCS L5973 represent?

Which patients and clinical workflow are described for L5973?

Which modifiers should be considered when billing L5973?

Which related CPT codes and services are often billed alongside L5973?

Which payers are included and what documentation is typically referenced for coverage of L5973?

References