HCPCS Level II L5679: Lower Extremity Silicone Gel Socket Insert

HCPCS Level II code L5679 describes a custom-fabricated or prefabricated below-knee or above-knee lower extremity socket insert made of silicone gel or elastomeric material (with or without perforations or breathable material) designed as an addition to a prosthetic socket and intended for use without a locking mechanism; service type: prosthetic socket insert/addition; typical site of service: prosthetics clinic, orthotics and prosthetics facility, or outpatient prosthetic service setting.

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HCPCS Level II L5679: Lower Extremity Silicone Gel Socket Insert

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Get alerted when payer policies referencing L5679 are released or updated.

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Clinical & Coding Specifications

Clinical Context

A 58-year-old male with a transtibial (below-knee) amputation presents to a prosthetics clinic for management of socket comfort and skin protection. The patient reports areas of friction and intermittent skin breakdown after prolonged ambulation in his current prosthesis. The prosthetist evaluates the residual limb, assesses limb volume and skin integrity, and determines that a custom-fabricated silicone gel socket insert will improve cushioning and pressure distribution. The workflow includes a clinical assessment visit, measurement and mold or scan of the residual limb (if using an existing mold, the insert is fabricated from that mold or from a prefabricated form and then custom-contoured), fitting and adjustment of the L5679 insert, patient education on insertion/removal and hygiene, and a follow-up appointment to confirm fit and monitor skin response. Typical sites of service are outpatient prosthetics clinics, ambulatory surgery centers for complex fittings, or specialty durable medical equipment providers that perform custom fabrication and fittings.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic(s) management and training, upper and/or lower extremity, initial encounter, with fitting and adjustment	Performed when the patient requires training and fitting education after insertion of the silicone gel socket insert
`97763`	Orthotic(s) management and training, subsequent encounter	Used for follow-up visits addressing ongoing adjustment or training with the insert
`L5000`*	Foot insert, removable, molded to patient model; total contact insert	Related in clinical workflow when additional foot orthoses are provided alongside a lower-limb socket insert (note: `L` codes are HCPCS Level II; listed here for clinical association)
`S1040`*	Provision of custom fabricated prosthetic insert (example local code)	Some payers or institutions use local codes for custom prosthetic components during fabrication and fitting
`99070`	Supplies and materials (medical), noncovered item or service by physician or other qualified health care professional	Used to bill non-covered supplies associated with fitting when payer policies disallow separate billing

*Note: L and S codes are not CPT codes but are commonly associated HCPCS or local codes used in the prosthetic workflow.

Related Modifiers

5 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…
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…
76	Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…	- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
63	Modifier‑63 is appended to surgical CPT codes (20000–69990) when a procedure is performed on a neonate or infant weighing ≤ 4 kg (about 8.8 lbs). The AMA/AAPC definition specifies this use and notes…	- Use modifier -63 only for surgical procedures in the CPT 20000–69990 series performed on a neonate or infant who weighs ≤ 4 kg at the time of the procedure; it indicates increased complexity due to…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207R00000X	Internal Medicine Physician	A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults…
363L00000X	Nurse Practitioner	(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
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.
282J00000X	Religious Nonmedical Health Care Institution	Furnishes only nonmedical nursing items and services to patients who choose to rely solely upon a religious method of healing, and for whom the accept…
261QM1102X	Military Outpatient Operational (Transportable) Component Clinic/Center	"Non-fixed" facilities or distinct parts of a "non-fixed" facility, providing outpatient medical and dental services, primarily intended for DoD activ…
207WX0009X	Glaucoma Specialist (Ophthalmology) Physician	An ophthalmologist who specializes in the treatment of glaucoma and other disorders related to increased intraocular pressure and optic nerve damage. …
1223P0700X	Prosthodontics	That branch of dentistry pertaining to the restoration and maintenance of oral functions, comfort, appearance and health of the patient by the restora…
235500000X	Speech/Language/Hearing Specialist/Technologist	General classification identifying individuals who are trained on a specific piece of equipment or technical procedure.

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) management and training, upper and/or lower extremity, initial encounter, with fitting and adjustment	Performed when the patient requires training and fitting education after insertion of the silicone gel socket insert
`97763`	Orthotic(s) management and training, subsequent encounter	Used for follow-up visits addressing ongoing adjustment or training with the insert
`L5000`*	Foot insert, removable, molded to patient model; total contact insert	Related in clinical workflow when additional foot orthoses are provided alongside a lower-limb socket insert (note: `L` codes are HCPCS Level II; listed here for clinical association)
`S1040`*	Provision of custom fabricated prosthetic insert (example local code)	Some payers or institutions use local codes for custom prosthetic components during fabrication and fitting
`99070`	Supplies and materials (medical), noncovered item or service by physician or other qualified health care professional	Used to bill non-covered supplies associated with fitting when payer policies disallow separate billing

*Note: L and S codes are not CPT codes but are commonly associated HCPCS or local codes used in the prosthetic workflow.

Related Modifiers

5 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…
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…
76	Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…	- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
63	Modifier‑63 is appended to surgical CPT codes (20000–69990) when a procedure is performed on a neonate or infant weighing ≤ 4 kg (about 8.8 lbs). The AMA/AAPC definition specifies this use and notes…	- Use modifier -63 only for surgical procedures in the CPT 20000–69990 series performed on a neonate or infant who weighs ≤ 4 kg at the time of the procedure; it indicates increased complexity due to…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207R00000X	Internal Medicine Physician	A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults…
363L00000X	Nurse Practitioner	(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
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.
282J00000X	Religious Nonmedical Health Care Institution	Furnishes only nonmedical nursing items and services to patients who choose to rely solely upon a religious method of healing, and for whom the accept…
261QM1102X	Military Outpatient Operational (Transportable) Component Clinic/Center	"Non-fixed" facilities or distinct parts of a "non-fixed" facility, providing outpatient medical and dental services, primarily intended for DoD activ…
207WX0009X	Glaucoma Specialist (Ophthalmology) Physician	An ophthalmologist who specializes in the treatment of glaucoma and other disorders related to increased intraocular pressure and optic nerve damage. …
1223P0700X	Prosthodontics	That branch of dentistry pertaining to the restoration and maintenance of oral functions, comfort, appearance and health of the patient by the restora…
235500000X	Speech/Language/Hearing Specialist/Technologist	General classification identifying individuals who are trained on a specific piece of equipment or technical procedure.

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 L5679: Lower Extremity Silicone Gel Socket Insert

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HCPCS Level II L5679: Lower Extremity Silicone Gel Socket Insert

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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 L5679: Lower Extremity Silicone Gel Socket Insert

Sign up for hcpcs L5679 policy alerts

HCPCS Level II L5679: Lower Extremity Silicone Gel Socket Insert

Sign up for hcpcs L5679 policy alerts

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

What does HCPCS code L5679 describe?

Where is L5679 typically furnished and what is the typical workflow?

Which modifiers and coding notes apply when billing L5679?

What related CPT/HCPCS or local codes are associated with L5679 in the workflow?

What clinical diagnoses and documentation elements are relevant when using L5679?

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

What does HCPCS code L5679 describe?

Where is L5679 typically furnished and what is the typical workflow?

Which modifiers and coding notes apply when billing L5679?

What related CPT/HCPCS or local codes are associated with L5679 in the workflow?

What clinical diagnoses and documentation elements are relevant when using L5679?

References