How to Bill CPT 97605 for Negative Pressure Wound Therapy Without Denials

Emily Carter
7 hours ago
4 min read

Negative pressure wound therapy can help wounds heal, but billing CPT 97605 correctly is what gets the claim paid. Many CPT 97605 denials happen because of missing wound measurements, weak medical necessity, or incorrect documentation.

A note that only says "wound VAC changed" isn't enough. The documentation should clearly include the wound size, device used, medical necessity, and the care provided.

What is CPT code 97605

CPT code 97605 is used for negative pressure wound therapy (NPWT), also called wound VAC therapy, performed with durable medical equipment on wounds with a total surface area of 50 square centimeters or less.

The 97605 CPT code description includes applying the NPWT device, assessing the wound, and providing instructions for ongoing care. CPT 97605 is billed once per treatment session and is not a timed code.

If you're searching for the CPT code for wound VAC change, remember that 97605 represents the complete skilled NPWT service, not just a dressing change. Your documentation should support the medical necessity of the treatment provided.

Here's the CPT 97605 description in plain terms. It's a per-session code that bundles the device application, the wound assessment, and the patient instructions into one billable unit. The AMA revised the descriptor in 2015, and it still holds for 2026.

When should you bill CPT code 97605

Bill CPT 97605 when the record supports these basic points:

The patient has a wound that is suitable for NPWT under the payer’s policy.
NPWT is medically necessary based on the wound’s condition and treatment history.
The total surface area of all treated wounds is 50 cm² or less.
The system uses a durable or reusable NPWT pump.
The clinician performs and documents the NPWT session.
The diagnosis code matches the wound type, site, side, and severity.

Medicare’s DME policy may also require proof that a complete wound treatment program was tried, or considered and ruled out, before NPWT began. The exact criteria depend on the wound type and care setting. Providers can review the current requirements in the CMS Negative Pressure Wound Therapy Pumps LCD.

Step-by-step guide to billing CPT code 97605

A clean 97605 claim follows a repeatable sequence. Skip any steps and you invite a denial.

Verify coverage and prior authorization. Many Medicare Advantage plans require prior auth for NPWT. Check the payer's policy before the first application.
Measure and document the wound in centimeters. The total treated wound area must qualify for CPT 97605.
Confirm the device type. CPT 97605 applies only when a durable NPWT system is used.
Pair the claim with the correct ICD-10 diagnosis code and use modifiers only when needed, such as the KX modifier for Medicare or anatomical modifiers when they apply.
A quick pre-bill check of the measurement, device, and modifier catches most errors.

Documentation requirements for CPT code 97605

Your notes are what get 97605 paid. Payers want medical necessity spelled out, and Medicare is the strictest of the bunch.

Every session note should have:

Wound location and size. Length, width, and depth. No size, no support for the code. It's that blunt.
Type of NPWT device. Say it's a durable system and include the dressing and the pressure setting.
What you did in the session. The dressing application, the wound check, the instructions you gave the patient.
Previous treatments tried. Show that simpler care came first, or explain why NPWT is the right move now.

Missing wound measurements are one of the most common reasons NPWT claims get denied. If the size isn't in the note, the payer acts as if it never happened.

Common Reasons CPT Code 97605 Claims Get Denied

Most CPT code 97605 claim denials happen because of a few common documentation or billing mistakes. Catching them before you submit the claim can save time and prevent payment delays.

Missing the KX Modifier

For Medicare claims, the KX modifier may be required to show that the documentation supports medical necessity. Leaving it off when it's required can result in a denial.

Wound Measurements Are Missing

CPT 97605 is based on the size of the treated wound. If the documentation doesn't include accurate wound measurements, the payer may not be able to verify that the code was billed correctly.

The Wrong NPWT Code Was Used

The type of negative pressure wound therapy device matters. CPT code 97605 applies to a durable NPWT system, while disposable systems are reported with different CPT codes. Using the wrong code is a common billing error.

Medical Necessity Is Not Clearly Documented

The record should explain why negative pressure wound therapy was needed and how it supports the patient's treatment plan. General notes without clinical support often lead to claim denials.

Prior Authorization Was Not Obtained

Some payers require prior authorization before NPWT begins. If approval was required but not obtained, the claim may be denied even when the treatment was appropriate.

Billing a Dressing Change as CPT 97605

A simple wound VAC dressing change does not automatically qualify for CPT code 97605. The documentation must support a complete skilled NPWT service, not just a dressing replacement.

FAQ

1. What is the 97605 CPT code description?

The 97605 CPT code description includes applying the NPWT device, assessing the wound, and providing patient instructions during the treatment session. It represents the complete skilled NPWT service, not just a wound VAC dressing change.

2. Does CPT code 97605 need a modifier?

CPT code 97605 does not always need a modifier. Use one only when the payer requires it, such as the KX modifier for Medicare or anatomical modifiers when appropriate.

3. What is CPT code 97605 used for?

CPT code 97605 is used for negative pressure wound therapy (NPWT) with a durable (non-disposable) wound VAC device when the total treated wound area is 50 cm² or less. Larger wounds treated with the same type of device are billed with CPT 97606.

4.Does Medicare pay for 97605?

Yes, Medicare may cover CPT code 97605 when the service is medically necessary and all documentation, coverage, and billing requirements are met under the applicable Medicare policy.