HCPCS Level II L5828: Endoskeletal Knee-Shin System, Fluid Swing/Stance

HCPCS Level II code L5828 describes the addition of an endoskeletal knee-shin prosthetic component with a single axis and fluid-based swing and stance phase control, representing a lower-extremity orthotic/prosthetic device used as a modular knee joint assembly for transfemoral or knee-disarticulation prostheses; service type: prosthetic component provision and fitting; typical site of service: prosthetics/orthotics clinic or outpatient prosthetic fitting facility.

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HCPCS Level II L5828: Endoskeletal Knee-Shin System, Fluid Swing/Stance

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Clinical & Coding Specifications

Clinical Context

A 54-year-old male transtibial amputee with a healed residual limb and chronic knee instability from a previous traumatic amputation is evaluated for prosthetic component upgrades. The multidisciplinary limb team (physiatrist, prosthetist, and physical therapist) determines the patient would benefit from an endoskeletal knee-shin system providing single-axis control with fluid swing and stance phase modulation to improve gait symmetry and safety. The prosthetist orders the component, documents baseline gait assessment, and obtains prior authorization from Medicare or the patients commercial payer. On delivery day in the outpatient prosthetics clinic (or ambulatory surgery/prosthetics lab if fitting requires sterile conditions), the prosthetist fits the L5828 knee-shin unit into the patients existing prosthesis, aligns the knee axis, and performs dynamic tuning during gait training. Follow-up visits with the prosthetist and physical therapist occur at 1 week, 4 weeks, and as clinically indicated to adjust hydraulic resistance and stance control settings. Billing uses the HCPCS Level II code L5828 with applicable modifiers for laterality, supplier type, or unusual circumstances; supporting clinical documentation includes residual limb status, functional mobility goals, gait assessment, and payer authorization details.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic(s)/prosthetic(s) management and training, initial encounter; each 15 minutes	Used by physical therapists or prosthetists for gait training and device use instruction after fitting the `L5828` component
`97761`	Prosthetic training, subsequent encounter, each 15 minutes	Used for follow-up prosthetic training sessions after initial fitting and tuning
`20550`	Injection(s); single tendon sheath, or ligament, or ganglion cyst (eg, trigger point) — (example procedure)	Occasionally used if soft-tissue injections are required to manage residual limb pain prior to definitive prosthetic fitting
`99070`	Supplies and materials (except spectacles), provided by the physician or supplier over and above those usually included with the office visit or other services	Used to bill nonstandard fitting materials, pads, or liners associated with customizing the `L5828` during fitting
`99456`	Work-related or medical disability examination services for work disability evaluation	May be used when a formal documentation of functional level is required for workers' compensation or disability determinations related to prosthetic provision

Related Modifiers

5 rows

Modifier	Description	When to Use
66	Modifier 66 (Surgical Team) is used when three or more surgeons act as primary surgeons on a single, highly complex procedure. The AMA defines it for use when a surgical team — often composed of…	- Use modifier 66 when three or more surgeons act as primary surgeons working collaboratively as a surgical team on a single, highly complex or difficult procedure (for example organ…
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…
51	Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…	- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…
33	Modifier 33 was created by the American Medical Association in response to the Affordable Care Act to identify services provided for preventive intent. It is appended to CPT/HCPCS codes that could be…	- Use modifier -33 when a CPT/HCPCS service that can be billed as either preventive or diagnostic/treatment is provided with preventive intent and aligns with USPSTF A or B recommendations or other…
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Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
2084P0800X	Psychiatry Physician	A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
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.
207RC0000X	Cardiovascular Disease Physician	An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threaten…
193200000X	Multi-Specialty Group	A business group of one or more individual practitioners, who practice with different areas of specialization.
364SP0200X	Pediatric Clinical Nurse Specialist	Physician Assistants & Advanced Practice Nursing Providers · Clinical Nurse Specialist
2472E0500X	EEG Technician	Technologists, Technicians & Other Technical Service Providers · Technician, Other
246X00000X	Cardiovascular Specialist/Technologist	An allied health professional who performs diagnostic examinations at the request or direction of a physician in one or more of the following three ar…
235Z00000X	Speech-Language Pathologist	The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in…

Related ICD-10-CM Codes

24 rows

ICD-10-CM Code	Description
G82.20	Paraplegia, unspecified
G83.4	Cauda equina syndrome
M17.0	Bilateral primary osteoarthritis of knee
M17.11	Unilateral primary osteoarthritis, right knee
M17.12	Unilateral primary osteoarthritis, left knee
M17.2	Bilateral post-traumatic osteoarthritis of knee
M17.9	Osteoarthritis of knee, unspecified
M23.91	Unspecified internal derangement of right knee
M25.561	Pain in right knee
M25.562	Pain in left knee

Showing 1–10 of 24

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(s)/prosthetic(s) management and training, initial encounter; each 15 minutes	Used by physical therapists or prosthetists for gait training and device use instruction after fitting the `L5828` component
`97761`	Prosthetic training, subsequent encounter, each 15 minutes	Used for follow-up prosthetic training sessions after initial fitting and tuning
`20550`	Injection(s); single tendon sheath, or ligament, or ganglion cyst (eg, trigger point) — (example procedure)	Occasionally used if soft-tissue injections are required to manage residual limb pain prior to definitive prosthetic fitting
`99070`	Supplies and materials (except spectacles), provided by the physician or supplier over and above those usually included with the office visit or other services	Used to bill nonstandard fitting materials, pads, or liners associated with customizing the `L5828` during fitting
`99456`	Work-related or medical disability examination services for work disability evaluation	May be used when a formal documentation of functional level is required for workers' compensation or disability determinations related to prosthetic provision

Related Modifiers

5 rows

Modifier	Description	When to Use
66	Modifier 66 (Surgical Team) is used when three or more surgeons act as primary surgeons on a single, highly complex procedure. The AMA defines it for use when a surgical team — often composed of…	- Use modifier 66 when three or more surgeons act as primary surgeons working collaboratively as a surgical team on a single, highly complex or difficult procedure (for example organ…
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…
51	Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…	- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…
33	Modifier 33 was created by the American Medical Association in response to the Affordable Care Act to identify services provided for preventive intent. It is appended to CPT/HCPCS codes that could be…	- Use modifier -33 when a CPT/HCPCS service that can be billed as either preventive or diagnostic/treatment is provided with preventive intent and aligns with USPSTF A or B recommendations or other…
[object Object]

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
2084P0800X	Psychiatry Physician	A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
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.
207RC0000X	Cardiovascular Disease Physician	An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threaten…
193200000X	Multi-Specialty Group	A business group of one or more individual practitioners, who practice with different areas of specialization.
364SP0200X	Pediatric Clinical Nurse Specialist	Physician Assistants & Advanced Practice Nursing Providers · Clinical Nurse Specialist
2472E0500X	EEG Technician	Technologists, Technicians & Other Technical Service Providers · Technician, Other
246X00000X	Cardiovascular Specialist/Technologist	An allied health professional who performs diagnostic examinations at the request or direction of a physician in one or more of the following three ar…
235Z00000X	Speech-Language Pathologist	The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in…

Related ICD-10-CM Codes

24 rows

ICD-10-CM Code	Description
G82.20	Paraplegia, unspecified
G83.4	Cauda equina syndrome
M17.0	Bilateral primary osteoarthritis of knee
M17.11	Unilateral primary osteoarthritis, right knee
M17.12	Unilateral primary osteoarthritis, left knee
M17.2	Bilateral post-traumatic osteoarthritis of knee
M17.9	Osteoarthritis of knee, unspecified
M23.91	Unspecified internal derangement of right knee
M25.561	Pain in right knee
M25.562	Pain in left knee

Showing 1–10 of 24

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 L5828: Endoskeletal Knee-Shin System, Fluid Swing/Stance

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HCPCS Level II L5828: Endoskeletal Knee-Shin System, Fluid Swing/Stance

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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 Level II L5828: Endoskeletal Knee-Shin System, Fluid Swing/Stance

Sign up for hcpcs L5828 policy alerts

HCPCS Level II L5828: Endoskeletal Knee-Shin System, Fluid Swing/Stance

Sign up for hcpcs L5828 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 L5828 represent?

Which modifiers should be considered when billing L5828?

What clinical documentation is needed to support a claim for L5828?

Where and how is the L5828 component typically delivered and fitted?

Which related CPT codes might be billed alongside L5828?

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 L5828 represent?

Which modifiers should be considered when billing L5828?

What clinical documentation is needed to support a claim for L5828?

Where and how is the L5828 component typically delivered and fitted?

Which related CPT codes might be billed alongside L5828?

References