How to Bill NPWT to Medicare: Wound VAC CPT Codes and Requirements

How to Bill NPWT to Medicare

There are two billing models for negative pressure wound therapy under Medicare, and they are mutually exclusive. The physician-applied model bills CPT 97607/97608 for in-office or bedside NPWT application and management. The DME model bills HCPCS E2402 (stationary pump) or E2102 (disposable device) for equipment the patient uses at home between visits. Which model applies depends on where the therapy is delivered and who manages the device -- not on clinical preference.

Getting this wrong is not a gray area. Billing physician-applied codes for a home DME setup, or vice versa, creates a compliance problem that no documentation can fix after the fact.

What are the two NPWT billing models?

Physician-applied NPWT is billed when the provider applies and manages the NPWT device during a clinical encounter -- in the office, at a skilled nursing facility, or during a home visit. The provider applies the wound filler, seals the dressing, initiates suction, and removes the setup at the end of the encounter or at a subsequent visit. The procedure codes are:

CPT 97607 — Application of NPWT, total wound surface area up to 50 sq cm
CPT 97608 — Application of NPWT, total wound surface area greater than 50 sq cm

These are per-session codes. You bill 97607 or 97608 each time NPWT is applied, alongside an E/M code for the evaluation component and any debridement performed during the same encounter.

DME-model NPWT is billed when the patient takes a wound VAC pump home and uses it continuously between provider visits. The DME supplier -- not the wound care provider -- bills Medicare Part B for the pump rental and supplies. The relevant HCPCS codes include E2402 (stationary NPWT pump), A6550 (wound VAC dressing kit), and A7000 (canister). The treating clinician writes the order and manages the patient's wound care but does not bill for the NPWT equipment.

Clinicians who perform wound care visits on a patient using a home wound VAC still bill for the visit itself (E/M, debridement, dressing changes) -- they just do not bill 97607/97608, because the NPWT device was not applied by the provider during that encounter.

For a detailed breakdown of both models, see our NPWT billing guide.

What documentation does Medicare require for NPWT?

Medicare requires documentation that NPWT is medically necessary and that conservative therapy has been tried and failed before NPWT is initiated. The documentation threshold is specific:

30-day conservative therapy failure. The record must show that the wound was treated with standard wound care -- moist wound therapy, offloading, compression, infection management as appropriate -- for at least 30 days without adequate healing progress. This is a hard prerequisite under most MAC LCDs. Skip it and the claim is denied on medical necessity.
Wound measurements at every encounter. Length, width, and depth in centimeters. Serial measurements establish whether the wound is responding to treatment. A single baseline measurement is not sufficient -- Medicare expects documented progression (or lack of progression justifying treatment change) over time.
Wound bed description. Tissue type (granulation, slough, eschar), percentage of wound bed covered, exudate amount and character, periwound skin condition, and signs of infection if present.
Medical necessity statement. Why NPWT was chosen, what prior treatments were attempted, how the wound responded to those treatments, and why continued NPWT is expected to achieve wound closure or surgical readiness.
Wound etiology. The underlying cause of the wound must be documented and coded with the appropriate ICD-10 diagnosis. NPWT for a diabetic foot ulcer (E11.621 + L97.x) has different LCD criteria than NPWT for a surgical wound dehiscence (T81.3x).

Missing any of these elements does not just weaken the claim -- it makes the KX modifier attestation unsupportable if the claim reaches audit.

Do Medicare Advantage plans require prior authorization for NPWT?

Traditional Medicare (fee-for-service) does not require prior authorization for NPWT. You document medical necessity, bill correctly, and claims adjudicate based on LCD criteria.

Medicare Advantage plans are different. Many MA plans require prior authorization before NPWT can be initiated. Requirements vary by plan and can include:

Clinical documentation showing conservative therapy failure (duration varies by plan -- some require 30 days, others require 14)
Wound photographs
A treatment plan with expected duration of NPWT therapy
Provider attestation of medical necessity
In some cases, peer-to-peer review before approval is granted

The authorization must be obtained before treatment begins. Retroactive authorization requests are accepted by some MA plans within 48-72 hours, but this is plan-specific and not guaranteed. Starting NPWT without verifying PA requirements for an MA patient is a direct path to a non-recoverable denial.

Check PA requirements during eligibility verification, before the first NPWT application -- not after.

What are the most common NPWT billing errors?

Billing 97607/97608 for home DME NPWT. The most frequent model-selection error. If the patient takes the wound VAC home, the DME supplier bills for the equipment. The treating provider bills for wound management visits but not for NPWT application codes.

Missing the 30-day conservative therapy requirement. Initiating NPWT on a wound that has no documented prior treatment history is a medical necessity denial on first review and a recoupment risk on audit. The 30 days of conservative therapy must be documented in the medical record, not just asserted in the note.

Wound measurements without serial comparison. A single set of measurements at the time of NPWT initiation does not demonstrate medical necessity. The record needs measurements from prior visits showing that the wound failed to progress under conservative management, and ongoing measurements during NPWT to demonstrate treatment response.

Omitting the wound etiology diagnosis. Billing NPWT with only a wound-site code (L97/L89) and no underlying etiology code (diabetes, venous insufficiency, peripheral arterial disease) weakens the medical necessity argument. Medicare expects the note to connect the wound to its cause.

Failing to verify MA plan PA requirements. Treating an MA patient the same as a traditional Medicare patient is a billing process error, not a clinical one. The wound care is identical; the administrative requirements are not. One missed PA check can result in a complete denial for weeks of NPWT therapy.

How do 97607 and 97608 differ?

The distinction is wound surface area at the time of NPWT application:

97607 — Total wound surface area up to and including 50 sq cm
97608 — Total wound surface area greater than 50 sq cm

These are not add-on codes to each other. You bill one or the other per session based on the wound area being treated. If you are treating multiple wounds with NPWT in the same encounter, the total combined wound surface area determines which code applies. Document each wound's measurements individually and sum them for code selection.

Both codes are billed per session, not per wound. One encounter with NPWT applied to three separate wounds totaling 40 sq cm uses 97607 once -- not three times.