Negative Pressure Wound Therapy (for New Mexico Only)

Coverage Summary

This is the UnitedHealthcare New Mexico outpatient policy for Negative Pressure Wound Therapy (NPWT), Policy Number CS157NM.C, effective June 1, 2026. The policy applies only to the state of New Mexico and defines outpatient coverage (and coverage on discharge from inpatient) for NPWT while noting that unproven/not medically necessary statements apply to all settings.

NPWT (vacuum-assisted wound closure) is described as a therapy that applies negative pressure to a wound to remove exudate, reduce bacterial contamination, increase local blood flow, reduce edema, approximate wound edges, and promote granulation tissue. The policy states NPWT is intended as an adjunctive therapy when wounds do not respond to conventional treatment (e.g., debridement, pressure relief, infection control) and requires that a complete wound therapy program be tried or considered and ruled out prior to initiation, including documentation that the open wound has not responded to conventional treatment after 30 days.

Overall coverage stance in this policy is mixed: NPWT is considered "proven and medically necessary" in the outpatient setting (or on discharge) for specific, listed indications when documentation and indication-specific criteria are met, while other indications/devices (including closed surgical incisions, pilonidal disease, disposable/single-use systems, and NPWT with instillation) are listed as unproven and not medically necessary.

Key thresholds and high-level stats

Conventional treatment failure period30 days

Wound area threshold for CPT split<= 50 sq cm or > 50 sq cm

Wound depth for discontinuation<= 1 mm

Evidence volumeMultiple systematic reviews and RCTs cited (including up to 62 RCTs in Cochrane 2022)

Overall evidence certaintyLow-to-moderate

Material documentation changeAdded language on required medical records documentation (legible, available upon request)

Proven and Medically Necessary (Outpatient or on Discharge from Inpatient)

Unproven and Not Medically Necessary (All Settings)

Not Medically Necessary / Unproven

The following indications and devices are unproven and not medically necessary for Negative Pressure Wound Therapy (NPWT) in any setting due to insufficient evidence of efficacy. Claims for these indications or devices are subject to denial.

ANY of the following

NPWT for treating all other indications not listed as proven and medically necessary (including, but not limited to, closed surgical incisions).
Pilonidal disease.
Disposable/single-use NPWT systems (including single-use devices such as A9272/97607/97608 when used for indications not otherwise covered).
Single-use systems may be separately addressed under coding and coverage rules if evidence supports a specific indication.

Contraindications and Discontinuation Criteria

Contraindications

NPWT is contraindicated when any of the following are present:

Active bleeding or exposed vasculature in the wound
Anticoagulation therapy
Eschar or necrotic tissue present in the wound
Exposed bone, nerves, or organs in the vicinity of the wound
Malignancy present in the wound

Provider Actions & Documentation Requirements

Documentation Required

Complete wound therapy documentation required prior to NPWT

Prior to initiating NPWT, providers must document that a complete wound therapy program was tried or considered. Required documentation includes evaluation, ongoing care, and wound measurements; evidence that dressings to maintain a moist wound environment were applied; debridement of necrotic tissue when present; assessment of and plans to address nutritional status; a provider-documented indication for NPWT; and documentation that the open wound has not responded to conventional treatment after 30 days.

Evaluation, care, and wound measurements
Application of dressings to maintain a moist wound environment
Debridement of necrotic tissue, if present
Evaluation of and provision for adequate nutritional status
Provider documentation of the indication for NPWT
Documentation that the open wound failed conventional treatment after 30 days

Coding (CPT / HCPCS / DME / Supply)

Applicable CPT (NPWT procedure codes)CPT

97605	Negative pressure wound therapy (e.g., vacuum assisted drainage collection), utilizing durable medical equipment (DME), including topical application(s), wound assessment, and instruction(s) for ongoing care, per session; total wound(s) surface area less than or equal to 50 square centimeters.
97606	Negative pressure wound therapy (e.g., vacuum assisted drainage collection), utilizing durable medical equipment (DME), including topical application(s), wound assessment, and instruction(s) for ongoing care, per session; total wound(s) surface area greater than 50 square centimeters.
97607	Negative pressure wound therapy (e.g., vacuum assisted drainage collection), utilizing disposable, non-durable medical equipment including provision of exudate management collection system, topical application(s), wound assessment, and instructions for ongoing care, per session; total wound(s) surface area less than or equal to 50 square centimeters.
97608	Negative pressure wound therapy (e.g., vacuum assisted drainage collection), utilizing disposable, non-durable medical equipment including provision of exudate management collection system, topical application(s), wound assessment, and instructions for ongoing care, per session; total wound(s) surface area greater than 50 square centimeters.

Applicable HCPCS / DME / Supply CodesHCPCS|mixed

A6550	Wound care set, for negative pressure wound therapy electrical pump, includes all supplies and accessories.
A9272	Wound suction, disposable, includes dressing, all accessories and components, any type, each.
E2402	Negative pressure wound therapy electrical pump, stationary or portable.
K0743-K0746	Suction pumps and dressing codes; coding clarification notes these HCPCS codes apply to devices other than negative pressure wound therapy.

Background & Evidence Summary

Major evidence themes noted in the policy mirror systematic reviews, RCTs, and HTAs with variable certainty: the Cochrane (Norman et al.) updates (2020/2022) summarized a large body of RCTs (62 RCTs, ~13,340 individuals in the 2022 update) and concluded that prophylactic NPWT probably reduces surgical site infections versus standard dressings, with no difference in wound dehiscence (moderate-certainty) and possible reduced postoperative mortality (low-certainty).

For pressure ulcers and some chronic wound types the evidence is of very low to low certainty and remains uncertain (Cochrane pressure ulcer review, Shi et al. 2023). Evidence for diabetic foot/neuropathic ulcers is mixed: several systematic reviews and RCTs suggest NPWT may improve healing and reduce amputations, but trial quality varies and overall certainty is often low.

Closed-incision/ciNPWT (iNPWT) evidence is mixed: some meta-analyses and specialty reviews report reduced surgical site complications and shorter length of stay for selected abdominal or high-risk incisions, but large RCTs (e.g., SUNRRISE, WHIST and other trials) show inconsistent results and some trials (e.g., terminated cesarean trial) raised safety/futility concerns — overall the evidence is variable and not uniformly supportive for routine use.

NPWT with instillation (NPWTi-d) shows promising signals in small studies, observational series, and meta-analyses (e.g., faster wound closure, fewer debridements, higher closure rates in traumatic/orthoplastic wounds), but the policy emphasizes that the evidence is low quality and heterogeneous, requiring larger high-quality RCTs.

For pilonidal disease the systematic reviews and pooled analyses identify potential benefits (reduced healing time and recurrence in some studies) but rate the certainty as very low, and the policy states insufficient evidence to support routine use.

Definitions

Term	Definition
Complete wound therapy program
Program including documentation of evaluation/care/measurements; moist dressings; debridement if present; nutritional evaluation; provider documentation of indication; and failure of conventional treatment after 30 days.
Gustilo Grade III Fracture
An open fracture with extensive soft tissue damage or an open segmental fracture, with IIIA, IIIB, IIIC subclassifications as defined in policy (IIIA: adequate soft tissue coverage despite extensive laceration or flaps; IIIB: extensive soft tissue loss with periosteal stripping and bone exposure often requiring flap coverage; IIIC: arterial injury requiring repair).
ciNPWT / iNPWT
Closed/incisional negative pressure wound therapy applied over primarily closed surgical incisions to potentially reduce surgical site complications.
s-NPWT
Single-use negative pressure wound therapy systems (disposable devices).
NPWTi-d
Negative pressure wound therapy with instillation and dwell time of wound solutions (NPWT with instillation), used to instill solution into the wound with dwell time followed by negative pressure; evidence is limited and heterogeneous.

Revision History

June 1, 2026Material ChangeLatest

Added language clarifying medical records documentation used for reviews, including that benefit coverage is determined by federal, state, or contractual requirements and that medical records documentation (relevant medical history, physical exam, and diagnostic test results) may be required to assess clinical criteria; documentation must be legible and made available upon request.

Administrative

Archived previous policy version CS157NM.B and updated Clinical Evidence and References sections to reflect current information.