HCPCS L5984: Endoskeletal Lower Extremity Axial Rotation Unit

HCPCS Level II code L5984 describes an all endoskeletal lower extremity prosthesis axial rotation unit, used as a component of a transtibial or transfemoral prosthesis to allow controlled rotation of the prosthetic limb; service type: prosthetic component supply and fabrication; typical site of service: prosthetics clinic or orthotics and prosthetics (O&P) facility.

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HCPCS L5984: Endoskeletal Lower Extremity Axial Rotation Unit

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Get alerted when payer policies referencing L5984 are released or updated.

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Clinical & Coding Specifications

Clinical Context

A 58-year-old male transtibial amputee presents to a prosthetics clinic for fabrication and fitting of an endoskeletal lower extremity prosthesis incorporating an axial rotation unit (L5984) to improve limb alignment and rotational control during gait. The patient has stable residual limb volume after amputation for peripheral arterial disease, completed wound healing, and has undergone prior prosthetic training. The multidisciplinary workflow includes a prosthetist assessment, casting or digital scan of the residual limb, selection and ordering of the axial rotation unit and compatible pylon components, bench alignment and assembly in the prosthetics lab, followed by an initial fitting visit for static and dynamic alignment, gait training with a physical therapist, and scheduled follow-up adjustments.

Service Type: Durable medical equipment/prosthetic component supply and fabrication for lower extremity prosthesis.
Typical Site of Service: Prosthetics and orthotics clinic, outpatient rehabilitation facility, or prosthetics laboratory with fitting in an ambulatory clinic setting.
Typical Patient Scenario: A patient requiring improved transverse plane mobility and rotational accommodation between socket and prosthetic foot, such as unilateral transtibial or transfemoral amputees with gait asymmetry, back pain from rotational stresses, or need for adjustable rotational control during activity.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic and prosthetic management and training, initial encounter, each 15 minutes	Used for initial prosthetic training and gait instruction after fitting the axial rotation unit.
`97763`	Orthotic and prosthetic management and training, subsequent encounter, each 15 minutes	Used for follow-up training sessions and adjustments after initial fitting.
`99070`	Supplies and materials (noncovered) used in the provision of services, over and above those usually included	May be used by some clinics to report expendable materials used during fitting and adjustments (payer rules vary).
`99499`	Unlisted evaluation and management service	Rarely used; do not use routinely—used only if no specific code applies for unique services associated with complex fittings.
`99080`	Miscellaneous services and supplies (used for documentation and forms)	Administrative code sometimes used for reporting prior authorization or complex documentation tasks.

Related Modifiers

5 rows

Modifier	Description	When to Use
26	Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…	- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
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…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
261QP2300X	Primary Care Clinic/Center	Ambulatory Health Care Facilities · Clinic/Center
208D00000X	General Practice Physician	A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
208VP0000X	Pain Medicine Physician	Pain Medicine is a primary medical specialty based on a distinct body of knowledge and a well-defined scope of clinical practice that is founded on sc…
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…
2278H0200X	Home Health Certified Respiratory Therapist	Home care fosters individual responsibility for self-management of chronic respiratory conditions. It includes individualized assessment based plans …
372600000X	Adult Companion	An individual who provides supervision, socialization, and non-medical care to a functionally impaired adult. Companions may assist or supervise the …
364SP2800X	Perioperative Clinical Nurse Specialist	Physician Assistants & Advanced Practice Nursing Providers · Clinical Nurse Specialist
163WN0002X	Neonatal Intensive Care Registered Nurse	Nursing Service Providers · Registered Nurse

Related ICD-10-CM Codes

17 rows

ICD-10-CM Code	Description
G54.4	Lumbosacral root disorders, not elsewhere classified
G54.6	Phantom limb syndrome with pain
M24.571	Contracture, right ankle
M24.572	Contracture, left ankle
M62.50	Muscle wasting and atrophy, not elsewhere classified, unspecified site
M79.671	Pain in right foot
M79.672	Pain in left foot
T84.019A	Broken internal joint prosthesis, unspecified site, initial encounter
Z43.3	Encounter for attention to colostomy
Z89.512	Acquired absence of left leg below knee

Showing 1–10 of 17

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

Service Type: Durable medical equipment/prosthetic component supply and fabrication for lower extremity prosthesis.
Typical Site of Service: Prosthetics and orthotics clinic, outpatient rehabilitation facility, or prosthetics laboratory with fitting in an ambulatory clinic setting.
Typical Patient Scenario: A patient requiring improved transverse plane mobility and rotational accommodation between socket and prosthetic foot, such as unilateral transtibial or transfemoral amputees with gait asymmetry, back pain from rotational stresses, or need for adjustable rotational control during activity.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic and prosthetic management and training, initial encounter, each 15 minutes	Used for initial prosthetic training and gait instruction after fitting the axial rotation unit.
`97763`	Orthotic and prosthetic management and training, subsequent encounter, each 15 minutes	Used for follow-up training sessions and adjustments after initial fitting.
`99070`	Supplies and materials (noncovered) used in the provision of services, over and above those usually included	May be used by some clinics to report expendable materials used during fitting and adjustments (payer rules vary).
`99499`	Unlisted evaluation and management service	Rarely used; do not use routinely—used only if no specific code applies for unique services associated with complex fittings.
`99080`	Miscellaneous services and supplies (used for documentation and forms)	Administrative code sometimes used for reporting prior authorization or complex documentation tasks.

Related Modifiers

5 rows

Modifier	Description	When to Use
26	Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…	- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
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…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
261QP2300X	Primary Care Clinic/Center	Ambulatory Health Care Facilities · Clinic/Center
208D00000X	General Practice Physician	A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
208VP0000X	Pain Medicine Physician	Pain Medicine is a primary medical specialty based on a distinct body of knowledge and a well-defined scope of clinical practice that is founded on sc…
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…
2278H0200X	Home Health Certified Respiratory Therapist	Home care fosters individual responsibility for self-management of chronic respiratory conditions. It includes individualized assessment based plans …
372600000X	Adult Companion	An individual who provides supervision, socialization, and non-medical care to a functionally impaired adult. Companions may assist or supervise the …
364SP2800X	Perioperative Clinical Nurse Specialist	Physician Assistants & Advanced Practice Nursing Providers · Clinical Nurse Specialist
163WN0002X	Neonatal Intensive Care Registered Nurse	Nursing Service Providers · Registered Nurse

Related ICD-10-CM Codes

17 rows

ICD-10-CM Code	Description
G54.4	Lumbosacral root disorders, not elsewhere classified
G54.6	Phantom limb syndrome with pain
M24.571	Contracture, right ankle
M24.572	Contracture, left ankle
M62.50	Muscle wasting and atrophy, not elsewhere classified, unspecified site
M79.671	Pain in right foot
M79.672	Pain in left foot
T84.019A	Broken internal joint prosthesis, unspecified site, initial encounter
Z43.3	Encounter for attention to colostomy
Z89.512	Acquired absence of left leg below knee

Showing 1–10 of 17

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 L5984: Endoskeletal Lower Extremity Axial Rotation Unit

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OpenPayer

HCPCS L5984: Endoskeletal Lower Extremity Axial Rotation Unit

Sign up for hcpcs L5984 policy alerts

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related ICD-10-CM Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related ICD-10-CM Codes

Related Codes

References

HCPCS L5984: Endoskeletal Lower Extremity Axial Rotation Unit

Sign up for hcpcs L5984 policy alerts

HCPCS L5984: Endoskeletal Lower Extremity Axial Rotation Unit

Sign up for hcpcs L5984 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 L5984 represent?

Where and in what clinical workflow is L5984 typically used?

Which CPT or other codes are commonly associated with services involving L5984?

What patient scenarios and clinical indications are described for using L5984?

What reimbursement or payer guidance is provided for L5984?

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related ICD-10-CM Codes

Related Codes

What does HCPCS L5984 represent?

Where and in what clinical workflow is L5984 typically used?

Which CPT or other codes are commonly associated with services involving L5984?

What patient scenarios and clinical indications are described for using L5984?

What reimbursement or payer guidance is provided for L5984?

References