HCPCS L5781: Lower Limb Prosthesis Vacuum Pump and Moisture Evacuation System

HCPCS Level II code L5781 denotes an addition to a lower limb prosthesis: a vacuum pump system for residual limb volume management and moisture evacuation. This prosthetic component supports socket fit and patient comfort by stabilizing limb volume and reducing skin moisture. Nationally, such components are important for improving prosthesis wear-time, reducing skin complications, and supporting functional outcomes for persons with lower-limb amputation.

Key payers covered in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical function of the device, typical sites of service where the component is supplied and fitted, and the payer landscape relevant to coverage and billing for prosthetic additions. The publication outlines common modifiers associated with prosthetic billing and notes where input data is not available. Practical benchmarks, coding considerations, and policy context related to durable medical equipment and prosthetic supplies are summarized to inform billing, clinical, and administrative audiences.

Data not available in the input: Associated taxonomies, ICD-10 diagnoses, related codes, and specific payer policy details.

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Billing Code Overview

HCPCS Level II code L5781 describes an addition to a lower limb prosthesis consisting of a vacuum pump, residual limb volume management and moisture evacuation system. This component is intended to be incorporated into a prosthetic socket system to help manage residual limb volume fluctuations and to evacuate moisture, improving socket fit and wearer comfort.

Service type: Prosthetic component supply and fitting, prosthetic socket enhancement
Typical site of service: Durable medical equipment suppliers, prosthetics and orthotics clinics, outpatient rehabilitation centers

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HCPCS L5781: Lower Limb Prosthesis Vacuum Pump and Moisture Evacuation System

Data not available in the input: Associated taxonomies, ICD-10 diagnoses, related codes, and specific payer policy details.

Customize your policy alerts

Sign up for hcpcs L5781 policy alerts

Get alerted when payer policies referencing L5781 are released or updated.

Monitor payer policy activity

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

Billing Code Overview

Service type: Prosthetic component supply and fitting, prosthetic socket enhancement
Typical site of service: Durable medical equipment suppliers, prosthetics and orthotics clinics, outpatient rehabilitation centers

Clinical & Coding Specifications

Clinical Context

A 62-year-old male with a transtibial amputation from peripheral arterial disease presents to a prosthetics clinic for evaluation of poor socket fit and fluctuating residual limb volume with associated skin maceration. He has a definitive prosthetic socket and gait training completed; however, he reports daily swelling in the afternoon and moisture accumulation inside the socket that causes skin irritation and odor. The prosthetist assesses the socket interface and determines that a vacuum pump and moisture evacuation system will be added to the existing lower limb prosthesis to improve limb volume management, suspension, and skin environment.

The clinical workflow includes: a prosthetic evaluation appointment, measurement and ordering of the vacuum pump add-on (L5781) as an addition to the existing prosthesis, coordination with the manufacturer/vendor for assembly and fitting, a delivery and fitting visit to integrate the vacuum and moisture system with the socket, patient education on use and maintenance, and follow-up visits to monitor limb volume stability, skin integrity, and function. Documentation includes the existing prosthesis identifier, the medical necessity supporting residual limb volume management, skin moisture issues, trial fitting notes, and device manufacturer details.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M24.471`	Contracture, right ankle	Residual limb contracture may affect socket fit and require volume management
`M24.472`	Contracture, left ankle	As above for left-sided amputees impacting socket interface
`T44.7X5A`	Toxic effect of other and unspecified agents, amputee sequela, initial encounter	Represents sequelae related to amputation where adjuncts to prosthesis may be required
`I70.213`	Atherosclerosis of native arteries of right leg with rest pain	Peripheral arterial disease often leads to amputation and ongoing limb volume/skin issues managed with prosthetic additions
`L89.309`	Pressure ulcer of unspecified heel and midfoot, unspecified stage	Skin breakdown or risk of maceration inside the socket supports need for moisture evacuation systems

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic management and training, initial encounter; fitting and training for prosthetic device	May be performed at delivery to train the patient on the vacuum pump system and gait training with the modified prosthesis
`97763`	Orthotic/prosthetic management and training, subsequent encounter	Used for follow-up training and adjustments after initial integration of the vacuum/moisture system
`99070`	Supplies and materials (except spectacles) provided by the physician over and above those usually included with the office visit	May be used when additional non-coded supplies are provided at fitting (check payer policies)
`96372`	Therapeutic, prophylactic, or diagnostic injection	Data not available in the input.
`99213`	Established patient office visit, typically 15 minutes	Common for routine prosthetist or physiatry follow-up visits related to device performance and skin checks

Related Modifiers

5 rows

Modifier	Description	When to Use
[object Object]	Increased procedural services	Use when unusually high work, time, or complexity were required for fitting beyond typical scope
[object Object]	Reduced services	Use when the addition is partially furnished or components are omitted from the full service
[object Object]	Unplanned return to the operating/procedure room	Generally not applicable but used if service required immediate return to a procedure area for device-related problem
[object Object]	Assistant surgeon	Rare for prosthetic additions; use when an assistant performed part of the procedure under applicable surgical codes
[object Object]	Distinct procedural service	Data not available in the input.

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
[object Object]	Physical Therapist	Provides gait training and functional training after fitting
[object Object]	Occupational Therapist	Assists with activities of daily living and device integration
[object Object]	Hearing and Speech Clinic/Center	An entity, facility, or distinct part of a facility providing diagnostic, treatment, prescriptive, and therapy services related to congenital and acqu…
[object Object]	Infusion Therapy Registered Nurse	Nursing Service Providers · Registered Nurse
[object Object]	Vascular-Interventional Technology Radiologic Technologist	A radiologic technologist who specializes in vascular interventional and is appropriately educated and trained, consistent with nationally recognized …
[object Object]	Transportation Network Company	A ride-sharing company that provides prearranged or contracted non-emergency medical transportation services to patients through mobile or online tech…
[object Object]	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…
[object Object]	Dance Therapist	The dance therapist, sometimes called a movement therapist, focuses on rhythmic body movements as a medium of physical and psychological change. Dance…

HCPCS L5000: Partial Foot Shoe Insert with Longitudinal Arch and 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 Tibial Tubercle and 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 Prosthesis, Metal Frame with Molded Leather Socket, Articulated Ankle/Foot

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

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

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

HCPCS L5105: Below-Knee Plastic Socket with Joints and SACH Foot

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

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

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

HCPCS L5160: Knee Disarticulation Molded Socket with Bent Knee and SACH Foot

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

HCPCS Level II L5200: Above-Knee Prosthesis with Single-Axis Knee

Showing 1–10 of 472

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 Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M24.471`	Contracture, right ankle	Residual limb contracture may affect socket fit and require volume management
`M24.472`	Contracture, left ankle	As above for left-sided amputees impacting socket interface
`T44.7X5A`	Toxic effect of other and unspecified agents, amputee sequela, initial encounter	Represents sequelae related to amputation where adjuncts to prosthesis may be required
`I70.213`	Atherosclerosis of native arteries of right leg with rest pain	Peripheral arterial disease often leads to amputation and ongoing limb volume/skin issues managed with prosthetic additions
`L89.309`	Pressure ulcer of unspecified heel and midfoot, unspecified stage	Skin breakdown or risk of maceration inside the socket supports need for moisture evacuation systems

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic management and training, initial encounter; fitting and training for prosthetic device	May be performed at delivery to train the patient on the vacuum pump system and gait training with the modified prosthesis
`97763`	Orthotic/prosthetic management and training, subsequent encounter	Used for follow-up training and adjustments after initial integration of the vacuum/moisture system
`99070`	Supplies and materials (except spectacles) provided by the physician over and above those usually included with the office visit	May be used when additional non-coded supplies are provided at fitting (check payer policies)
`96372`	Therapeutic, prophylactic, or diagnostic injection	Data not available in the input.
`99213`	Established patient office visit, typically 15 minutes	Common for routine prosthetist or physiatry follow-up visits related to device performance and skin checks

Related Modifiers

5 rows

Modifier	Description	When to Use
[object Object]	Increased procedural services	Use when unusually high work, time, or complexity were required for fitting beyond typical scope
[object Object]	Reduced services	Use when the addition is partially furnished or components are omitted from the full service
[object Object]	Unplanned return to the operating/procedure room	Generally not applicable but used if service required immediate return to a procedure area for device-related problem
[object Object]	Assistant surgeon	Rare for prosthetic additions; use when an assistant performed part of the procedure under applicable surgical codes
[object Object]	Distinct procedural service	Data not available in the input.

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
[object Object]	Physical Therapist	Provides gait training and functional training after fitting
[object Object]	Occupational Therapist	Assists with activities of daily living and device integration
[object Object]	Hearing and Speech Clinic/Center	An entity, facility, or distinct part of a facility providing diagnostic, treatment, prescriptive, and therapy services related to congenital and acqu…
[object Object]	Infusion Therapy Registered Nurse	Nursing Service Providers · Registered Nurse
[object Object]	Vascular-Interventional Technology Radiologic Technologist	A radiologic technologist who specializes in vascular interventional and is appropriately educated and trained, consistent with nationally recognized …
[object Object]	Transportation Network Company	A ride-sharing company that provides prearranged or contracted non-emergency medical transportation services to patients through mobile or online tech…
[object Object]	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…
[object Object]	Dance Therapist	The dance therapist, sometimes called a movement therapist, focuses on rhythmic body movements as a medium of physical and psychological change. Dance…

HCPCS L5000: Partial Foot Shoe Insert with Longitudinal Arch and 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 Tibial Tubercle and 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 Prosthesis, Metal Frame with Molded Leather Socket, Articulated Ankle/Foot

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

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

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

HCPCS L5105: Below-Knee Plastic Socket with Joints and SACH Foot

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

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

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

HCPCS L5160: Knee Disarticulation Molded Socket with Bent Knee and SACH Foot

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

HCPCS Level II L5200: Above-Knee Prosthesis with Single-Axis Knee

Showing 1–10 of 472

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 L5781: Lower Limb Prosthesis Vacuum Pump and Moisture Evacuation System

Sign up for hcpcs L5781 policy alerts

Billing Code Overview

OpenPayer

HCPCS L5781: Lower Limb Prosthesis Vacuum Pump and Moisture Evacuation System

Sign up for hcpcs L5781 policy alerts

Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Related Diagnoses

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Related Diagnoses

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

References