Kaiser Permanente NPWT Coverage Update, Prior Auth

Coverage Criteria for NPWT

Initial Coverage - Traditional NPWT

Covered when ALL of the following are met for an initial 30-day course:

tNPWT Initial Coverage: 1) Patient has a Stage III or IV pressure ulcer, neuropathic/diabetic ulcer, venous insufficiency or arterial ulcer, or a chronic mixed-etiology ulcer with exudate, size and depth requiring specialized therapy; 2) A complete wound therapy program (including the general measures below and wound-type specific measures as applicable) has been tried for 30 days unless edema/exudate mandates earlier initiation of NPWT; 3) Documentation in the medical record of evaluation, care, and wound measurements by a licensed medical professional, with consideration/addressing of bleeding risk, anticoagulation status, friable or infected vessels, vascular anastomoses, infected wounds, osteomyelitis, exposed organs/vessels/nerves/tendons/ligaments, sharp bony fragments, enteric fistulae, need for MRI/hyperbaric/defibrillation considerations, dressing application to maintain a moist wound environment, debridement of necrotic tissue if present, and nutritional status; 4) Wound-type specific requirements: for Stage III/IV pressure ulcers ensure appropriate turning/positioning and moisture/incontinence management; for neuropathic/diabetic ulcers ensure comprehensive diabetic management and appropriate off-loading; for venous insufficiency ulcers ensure Ankle-Brachial Index performed per guidelines and consistent use of compression where appropriate; 5) For inpatient-encounter wounds or surgically created/traumatic wounds (e.g., dehiscence, preoperative flap or graft) documentation of medical necessity for accelerated granulation is provided and other topical wound treatments have been tried or are not appropriate.initial 30-day trial

See contraindications/exclusions for use (e.g., necrotic tissue without debridement, untreated osteomyelitis, exposed vital structures, fistulae, malignancy, recent albumin ≤2.5, pediatric patients).

Initial Coverage - Disposable/single-use NPWT (SNAP)

SNAP/single-use NPWT may be used instead of tNPWT when ALL of the following are met:

SNAP Initial Coverage: 1) Kaiser Permanente initial coverage request form completed and faxed to DME per local process; 2) Wound has exudate and size/depth requiring specialized therapy and a complete wound therapy program has been tried for 30 days unless edema/exudate mandates earlier use; 3) Wound size is less than 13 cm x 13 cm; 4) Wound drainage is ≤ 180 mL per week (≈20 mL/day); 5) Dressing changes occur at least twice per week and cartridge is disposed when full (typical cartridge ≈60 mL); 6) Contraindications to disposable NPWT are absent (including inadequately drained wounds, necrotic tissue/eschar without debridement, exposed vessels/anastomoses/organs/tendons/nerves, wounds with malignancy, fistulae, untreated osteomyelitis, actively bleeding wounds).size and drainage limits

SNAP supplies coverage limited to a maximum of 4 devices per 30 days unless documented need for more frequent replacement.

Continued Coverage

Continued coverage (tNPWT/SNAP) requires ALL of the following:

Continued Coverage: 1) Regular direct assessment of the wound(s) by a licensed medical professional and supervision or direct performance of NPWT dressing changes; 2) At least weekly documentation of wound dimensions, characteristics, degree of granulation and management of exudate; 3) Monthly laboratory values to demonstrate that contraindications do not exist; 4) If using SNAP and the wound increases in size or produces exudate above SNAP parameters, evaluate for transition to tNPWT or other wound management strategies; 5) Continued coverage will be denied if these monitoring and documentation criteria are not fulfilled.weekly and monthly monitoring intervals

Coverage ends when continued-coverage criteria cease, treating physician determines adequate granulation for discontinuation, or progressive healing has failed over the prior 30 days with documented serial measurements.

s-NPWT for Surgical Site Infection (SSI) Prevention

s-NPWT for SSI prevention stance:

s-NPWT for SSI Prevention: Single-use NPWT may have a role in prevention of surgical site infections for high-risk surgeries; when used for SSI prevention s-NPWT is considered a surgical dressing and is covered under the procedure billing code and is not separately reimbursed.procedural billing vs separate coverage

Treat s-NPWT as included with the surgical procedure billing when used for SSI prevention.

tNPWT (Traditional NPWT)

Considered Medically Necessary when criteria in the applicable policy statements listed above are met:

tNPWT medical necessity: Traditional NPWT is considered medically necessary when the applicable policy criteria (initial and continued coverage criteria and contraindication checks) are met.see policy statements

Referenced HCPCS codes (e.g., A6550, A7000, E2402, K0743-46) apply.

s-NPWT and Non-powered NPWT

Coverage conclusions for non-powered and single-use NPWT devices:

s-NPWT / non-powered devices: Evidence is insufficient or of low-to-moderate quality regarding safety and effectiveness of non-powered and certain single-use NPWT devices for many wound indications; historical MTAC reviews characterize SNAP and PICO as not meeting Medical Technology Assessment Criteria for broad use, though some RCTs show benefit in highly selected patients.evidence insufficient or low-moderate

Device-specific evidence summaries should guide coverage; SNAP has limited, conditional coverage per specific size/drainage criteria.

Skin Grafts and Flaps

Use for skin grafts and flaps:

NPWT for skin grafts/flaps: Negative pressure wound therapy meets Kaiser Permanente Medical Technology Assessment Criteria for use as a splint or bolster for skin grafts and flaps based on RCTs and observational studies and is supported as medically appropriate for this indication.clinical indication: skin graft/flap bolstering

Supported by NIH QIS review and selected randomized trials.

Contraindications and exclusions for NPWT include wounds with necrotic tissue with eschar unless debrided, untreated osteomyelitis in the wound vicinity, wounds with the possibility of malignant cells, presence of a fistula to an organ or body cavity, and wounds with exposed vasculature, nerves, anastomotic sites, or organs. Other exclusions include actively bleeding wounds, wounds that are inadequately drained, wounds containing malignancy, and pediatric patients (newborns, infants, children). A recent serum albumin ≤ 2.5 g/dL is also listed as a contraindication.

Historical MTAC reviews of Vacuum Assisted Closure/NPWT found limited and inconsistent evidence. Early MTAC reviews (2003, 2008) identified small randomized trials with conflicting results and concluded that VAC/NPWT did not meet Kaiser Permanente Medical Technology Assessment (MTAC) criteria for the treatment of non-healing wounds due to insufficient, low-quality evidence. Subsequent appraisals summarized that, overall, published studies were heterogeneous, often small, and provided insufficient evidence to definitively establish safety and comparative effectiveness for many wound indications.

More recent MTAC reviews continued to find that evidence for many single-use or non‑powered NPWT devices (for example, SNAP and PICO) was insufficient to meet MTAC criteria. The 2015 MTAC review explicitly concluded there was insufficient evidence to support safety and effectiveness of non‑powered devices, and the 2019 review of single‑use NPWT identified limited RCT data and meta-analyses but ultimately maintained that SNAP & PICO did not meet MTAC criteria for routine treatment of non‑healing wounds.

The policy distinguishes traditional electrically powered NPWT (tNPWT) from disposable/single‑use systems. SNAP/single‑use NPWT may be used instead of tNPWT when specific size and drainage thresholds are met (wound <= 13 cm x 13 cm and drainage ≤ 180 mL/week) and when required documentation and prior conservative therapy criteria are satisfied. For surgical site infection prevention, single‑use NPWT is considered a surgical dressing and is covered as part of the procedure (not separately reimbursed). Supply limits reflect this distinction: tNPWT supply codes and canister rules (e.g., limits on A6550/A7000) differ from SNAP device limits (typical cap of 4 devices per 30 days unless documented need).

Supply Coverage Limits

Supplies coverage limits and usage rules:

Supply Limits: 1) tNPWT: up to 6 dressing kits (A6550) per wound per 30 days unless wound size documentation requires more; dressings normally changed up to 3 times/week; 2) tNPWT: up to 2 canister sets (A7000) per 30 days unless documented drainage >90 mL/day (high-volume exudative wounds should use a stationary pump with largest canister); excess canister utilization due to equipment failure (not excessive drainage) is not covered; 3) SNAP: up to 4 devices per 30 days unless documented need for more frequent replacement due to drainage; 4) CPT codes 97607/97608 should be used only for initial application of an entirely new SNAP device or removal and replacement with an entirely new SNAP device, not for routine SNAP dressing changes.per 30-day maxima

Supplies must be returned or discontinued when no longer used; billing restrictions apply.

Coding and Supplies

Supplies for traditional NPWTHCPCSCovered

A6550	Wound dressing kits (tNPWT) — referenced maximum 6 per wound per 30 days
A7000	Canister set (tNPWT) — referenced maximum 2 per 30 days

SNAP application/replacement procedure codesCPTCovered

97607	Application of SNAP device — use when initially applying an entirely new SNAP device
97608	Removal and replacement of SNAP device — use when removing and replacing with a new SNAP device

HCPCS Codes for traditional NPWT componentsHCPCSCovered

A6550	Wound care set, for negative pressure wound therapy electrical pump, includes all supplies and accessories
A7000	Canister, disposable, used with suction pump, each
E2402	Suction pump, home model, portable, for use on wounds
K0743	Absorptive wound dressing for use with suction pump, home model, portable, pad size 16 sq. in or less
K0744	Absorptive wound dressing for use with suction pump, home model, portable, pad size more than 16 sq. in but
K0745	Absorptive wound dressing for use with suction pump, home model, portable, pad size more than 16 sq. in but
K0746	K0746

CPT/HCPCS Codes for NPWT sessions and disposable systemsmixedCovered

97607	Negative pressure wound therapy per session; total wound(s) surface area <= 50 square centimeters
97608	Negative pressure wound therapy per session; total wound(s) surface area > 50 square centimeters
A9272	Wound suction, disposable, includes dressing, all accessories and components, any type, each

inv-17: SNAP wound size — eligibility threshold for initial coverage

SNAP wound size eligibilityWound size < 13 cm x 13 cm

SNAP coverage contextApplies when SNAP used instead of traditional NPWT and Kaiser Permanente initial coverage request form is submitted to DME

Supply limit noteSNAP supplies limited to typical maximum of 4 devices per 30 days (see supply limits)

inv-18: SNAP drainage — eligibility threshold (≤ 180 mL/week ≈20 mL/day)

SNAP drainage eligibilityWound drainage ≤ 180 mL/week (≈20 mL/day)

Cartridge handling

Provider Requirements, Authorization & Documentation

Prior Authorization

Prior authorization and coding notes

Certain disposable single-use NPWT systems (e.g., SNAP, Prevena, V.A.C. VIA) require completion of the Kaiser Permanente Initial Coverage Request form and fax submission to DME at 877-290-4632 prior to initiation. Reference applicable HCPCS/CPT codes when requesting authorization (for example A6550, A7000, A9272, 97607, 97608).

Affected codes include A6550, A7000, A9272, 97607, 97608 — verify plan-specific code requirements via the Pre-authorization Code Check.

Prior Authorization

Pre-authorization may be required for NPWT codes

Pre-authorization may be required for NPWT devices and related codes. Verify authorization requirements for the specific code and member plan using the Pre-authorization Code Check before ordering or furnishing equipment/supplies.

Use the Pre-authorization Code Check to confirm requirements by plan type.
If pre-authorization is required, include all supporting documentation (see documentation callout).

Background and Evidence Summary

Negative Pressure Wound Therapy (NPWT) is a wound dressing system that applies subatmospheric pressure (commonly in the range of -50 to -125 mmHg, with −125 mmHg often used as a default) via a pump, tubing, and a sealed dressing to remove exudate, reduce edema, and promote granulation tissue formation. NPWT systems are FDA‑approved for a range of wounds including chronic, acute, traumatic, dehisced wounds, partial‑thickness burns, ulcers, flaps, and grafts, but they are contraindicated when vital structures are exposed, tissue is devitalized or malignant, osteomyelitis is untreated, or when patient factors (for example untreated coagulopathy or component allergy) exist.

The evidence base for single‑use and disposable NPWT devices is mixed. MTAC reviews found a small number of randomized trials and several observational studies; some RCTs and meta‑analyses compared s‑NPWT to conventional dressings or to traditional NPWT, but study sizes and heterogeneity limit firm conclusions. The 2015 MTAC review concluded that evidence for non‑powered devices was insufficient, and the 2019 review of single‑use NPWT again determined SNAP and PICO did not meet MTAC criteria for routine use in non‑healing wounds despite some RCTs suggesting benefit in selected populations. As a result the policy treats s‑NPWT as potentially useful in select scenarios (including SSI prevention where it functions as a surgical dressing) but requires adherence to the policy’s size/drainage thresholds, documentation, and prior conservative therapy before coverage.

Definitions

inv-31: NPWT definition — wound dressing system with pump, tubing, dressing applying subatmospheric pressure

DefinitionNegative Pressure Wound Therapy (NPWT) is a wound dressing system comprising a vacuum pump, drainage tubing, and a dressing set that applies subatmospheric pressure to a wound to promote healing

ComponentsSystem components include foam or gauze dressing, adhesive film drape, vacuum pump, and drainage tubing

PurposeApplied to promote granulation, reduce edema and exudate, and potentially improve graft integration

inv-32: SNAP / single-use NPWT (s-NPWT) — Disposable single-use systems intended for smaller wounds

DefinitionSNAP / single-use NPWT (s-NPWT) are disposable, single-use negative pressure therapy systems (e.g., SNAP, Prevena, V.A.C. VIA) intended for smaller wounds with defined size and drainage limits

Eligibility limits

OpenPayer

Negative Pressure Wound Therapy (NPWT) — Clinical Review Criteria

Coverage Criteria for NPWT

Coding and Supplies

Provider Requirements, Authorization & Documentation

Background and Evidence Summary

Definitions