NPWT Billing Guide: Wound VAC CPT Codes and Medicare Requirements

Negative pressure wound therapy is one of the most effective interventions for complex wounds. It's also one of the most confusing to bill. There are two completely different billing models for NPWT — and picking the wrong one doesn't just lose revenue, it creates compliance exposure.

This guide covers both models, the CPT codes, Medicare documentation requirements, and the billing errors that trigger denials.

Two NPWT Billing Models

Before you touch a CPT code, you need to know which billing model you're operating under. They're mutually exclusive, and mixing them is a compliance problem.

DME Model (Medicare Part B)

A durable medical equipment supplier provides the NPWT pump, canisters, and dressing kits. The DME vendor bills Medicare Part B for the equipment using HCPCS E-codes (E2402 for the pump, A6550 for dressing sets, A7000 for canisters). The vendor handles the DME claim, prior authorization, and equipment logistics.

Your role:

Apply and change the NPWT dressing during wound care visits
Document the wound with measurements, bed description, and medical necessity
Coordinate with the DME vendor on supply needs
Bill your services — E/M codes and debridement codes for wound bed preparation

You do not bill for the NPWT application itself in the DME model. The pump lives at the patient's location between visits. This is the most common model for traditional NPWT devices (KCI V.A.C., Smith+Nephew PICO, Medela Invia) in home health and outpatient wound care.

Physician-Applied Model

You supply a disposable, single-use NPWT device and apply it at the point of care. The device stays on the wound until the next visit. You own the device, you apply it, and you bill for it using CPT 97607 and 97608.

Higher revenue per visit — you bill the application procedure on top of E/M and debridement
You absorb the supply cost for the disposable device
No DME vendor coordination — simpler logistics
You own the full documentation burden for both the service and the therapy justification

Common disposable NPWT devices in this model: PICO (Smith+Nephew), Prevena (KCI/3M), and Snap (Solstas/Acelity).

The critical rule: You cannot bill 97607/97608 if a DME vendor is supplying the NPWT device. These codes are for physician/clinician-applied disposable devices only. Billing 97607 when a DME company is billing E2402 for the same patient and wound is a compliance violation.

CPT Codes for NPWT

97607 — Negative Pressure Wound Therapy, First Wound

CPT 97607 covers application of negative pressure wound therapy using a disposable device — wound assessment, dressing application, and initiation of negative pressure. One wound, one session, one unit. Wound size doesn't change the code.

Billed per session, not per unit of time
Requires wound measurements, wound bed condition, and medical necessity documentation
Only valid with a disposable, clinician-applied NPWT device

97608 — Each Additional Wound (Add-On Code)

CPT 97608 is an add-on code billed for each additional wound treated with NPWT in the same session. It cannot be billed alone — it must accompany 97607.

If a patient has three wounds receiving NPWT at the same visit, you bill one unit of 97607 (first wound) and two units of 97608 (additional wounds). Each wound must be separately documented with its own measurements, wound bed description, and clinical justification.

E/M Billing Alongside NPWT

You can bill E/M on the same date as 97607/97608 when the evaluation and management work goes beyond what's inherent in the NPWT application itself. In practice, this applies to most wound care visits — you're evaluating overall wound status, reviewing medications, assessing for infection, and adjusting the care plan.

Use modifier -25 on the E/M code to indicate a significant, separately identifiable service. If you perform debridement before applying the NPWT dressing — clinically common — you can bill the debridement code alongside 97607 as well. Document each service separately.

Medicare Documentation Requirements

Medicare coverage for NPWT, whether billed as DME or physician-applied, requires documentation that meets specific medical necessity criteria. The documentation requirements are outlined in Local Coverage Determinations that vary by MAC jurisdiction, but the core elements are consistent.

Failed Conservative Therapy

Evidence that the wound has been treated with standard wound care for at least 30 days without adequate healing. The same threshold applies to skin substitute billing and other advanced therapies.

The documentation must specify:

What conservative treatments were provided (debridement, moisture management, offloading, compression, infection control)
How long each treatment was tried
Wound measurements showing failure to progress toward closure
Why escalation to NPWT is now clinically indicated

"Failed conservative therapy" as a checkbox note is insufficient. Name the treatments, document the duration, and show the measurement trajectory.

Wound Measurements and Bed Description

Every NPWT visit requires wound measurements in centimeters — length, width, and depth. Document tunneling or undermining with extent and clock position.

The wound bed description must include:

Tissue type percentages (granulation, slough, eschar, epithelial)
Exudate amount and character (serous, serosanguineous, purulent)
Wound edges and periwound skin condition
Signs of infection or biofilm

These measurements justify the current session and demonstrate progression over the treatment course. A wound that isn't measurably improving visit over visit will trigger a medical necessity review.

Prior Authorization Requirements

Traditional Medicare (fee-for-service) does not require prior authorization for NPWT. Medicare Advantage plans frequently do. The process varies by plan but typically requires clinical documentation supporting medical necessity, wound measurements showing failed conservative therapy, a treatment plan specifying expected duration, and evidence that the wound meets coverage criteria.

Verify PA requirements with the specific MA plan before initiating NPWT. Applying the device without required authorization is a guaranteed denial.

Reimbursement Economics

The DME vs. physician-applied decision directly impacts practice revenue.

Medicare national average reimbursement for CPT 97607 is approximately $90-$110 per session, depending on geographic locality and facility vs. non-facility setting. CPT 97608 reimburses at approximately $45-$55. These amounts are on top of E/M and debridement codes billed on the same visit.

In the DME model, your per-visit revenue comes from E/M and debridement only. The DME vendor captures the equipment revenue. In the physician-applied model, you add 97607/97608 revenue but absorb the disposable device cost — typically $100-$300 per device depending on product and vendor pricing.

The math depends on your negotiated device pricing, visit volume, and payer mix. High-volume practices with favorable device contracts generate meaningfully higher revenue per visit with the physician-applied model. Low-volume practices may not justify the margin. Run the numbers for your practice — include device cost, storage, expired-unit waste, and inventory management time.

Common NPWT Billing Errors

Billing 97607 when a DME vendor supplies the device

If a DME company is providing the NPWT pump and billing Medicare for the equipment, you cannot also bill 97607. These are separate billing models. Double-billing creates a compliance problem beyond a simple denial. Fix: Confirm which model is in effect for each NPWT patient. DME vendor involved = bill E/M and debridement only.

Missing the 30-day conservative treatment documentation

Initiating NPWT before documenting 30 days of failed conservative therapy. Even if the wound warrants negative pressure, Medicare requires the treatment history. Fix: Review the chart for 30 days of documented conservative treatment with measurements showing inadequate progress before the first NPWT session.

No wound measurements at NPWT visits

Applying the dressing without measuring. Common when the wound is under an existing NPWT dressing — the clinician removes the old dressing and applies the new one without documenting dimensions. Fix: Measure before every dressing change. No measurements, no billable session.

Billing 97608 without 97607

97608 is an add-on code that cannot stand alone. Fix: 97607 must always be the primary NPWT code on any claim that includes 97608.

Failing to document each wound separately

When multiple wounds receive NPWT, billing 97607 + 97608 without individual wound documentation. Each wound needs its own measurements, bed description, and justification. Fix: Document each wound in its own section with individual assessments.

Missing modifier -25 on same-day E/M

Billing E/M on the same date as 97607 without modifier -25, or with -25 but without documentation supporting a separately identifiable service. Fix: Append -25 and ensure the note documents E/M work beyond the NPWT application.

When to Use NPWT: Clinical Indications That Support Billing

The clinical indication must align with documented wound characteristics. Wounds that typically meet Medicare NPWT coverage criteria:

Deep pressure ulcers (Stage 3-4) with significant tissue loss and moderate to heavy exudate
Post-surgical wound dehiscence where primary closure has failed
Large chronic wounds with heavy exudate unresponsive to 30+ days of conservative management
Diabetic foot ulcers with adequate vascular status (NPWT requires sufficient perfusion)
Traumatic wounds with significant soft tissue loss requiring granulation tissue formation

Before initiating NPWT, document wound bed preparation: adequate debridement, infection control, and perfusion assessment. A wound with active infection, exposed vessels, or undebrided necrotic tissue is not an NPWT candidate — and billing it as one is a denial waiting to happen.

For the complete framework on documenting wound progression, see the wound care billing guide and the LCD compliance guide.

Build NPWT Billing Into Your Workflow

NPWT billing errors are almost always workflow problems, not knowledge problems. The breakdown happens when the documentation workflow doesn't enforce every required element before the note is attested and the claim is submitted.

Purpose-built wound care documentation that prompts for measurements, prior treatment history, and medical necessity language at bedside eliminates the most common denial triggers. The clinician documents once, correctly — and the billing team receives a complete, pre-coded claim.

Book a demo to see how guided documentation and real-time compliance checks work for NPWT billing.

Want the complete guide? Download The Mobile Wound Care Playbook — includes NPWT billing workflows, compliance frameworks, and revenue cycle strategy for wound care practices.