CPT 97605 – NPWT Using Durable Medical Equipment (≤ 50 sq cm)

Negative Pressure Wound Therapy (NPWT) is a key component of advanced wound management, especially when provided through durable medical equipment (DME). Because this therapy is both clinically intensive and financially significant, precise coding is essential to meet payer expectations and ensure proper reimbursement. CPT 97605 is used specifically for NPWT applied to wounds 50 square centimeters or smaller, making accurate measurement and documentation vital for compliance.

This guide explains when to use CPT 97605, key documentation and billing requirements, and common scenarios to help ensure clean claims and prevent denials.

What Is CPT 97605?

CPT 97605 describes the use of Negative Pressure Wound Therapy (NPWT) performed with durable medical equipment (DME) on a wound 50 square centimeters or smaller.

The key elements of CPT 97605 include:

• DME NPWT pump is required (not disposable NPWT).
• Code is billed per session, not per wound.
• Total wound surface area must be 50 sq cm or less.
• Includes wound assessment, dressing application, pump setup, and patient instructions.
• Describes professional services provided when a provider applies the NPWT.

CPT 97605 is often used in outpatient wound centers, physician offices, and hospital outpatient departments.

Understanding NPWT Using Durable Medical Equipment

NPWT using DME is also commonly known as vacuum-assisted closure therapy. It involves the use of an electrically powered vacuum pump rented or supplied as DME. Unlike disposable NPWT systems, which use lightweight, small, battery-powered units, DME systems are more robust and can deliver higher pressure ranges and more advanced settings.

NPWT is used to treat complex or chronic wounds because it:

• Removes exudate and infectious material
• Reduces edema
• Promotes granulation tissue formation
• Helps draw wound edges together
• Maintains a moist wound healing environment

DME NPWT is typically reserved for wounds that require stronger suction or long-term therapy and is often preferred for:

• Chronic diabetic ulcers
• Large or deep pressure ulcers
• Postoperative wounds with high drainage
• Traumatic wounds
• Grafted or flap sites
• Slowly healing surgical wounds

NPWT may be prescribed for weeks or months, depending on the patient’s condition, making accurate weekly or per-session coding essential for ongoing reimbursement.

Procedure Components Included Under CPT 97605

When reporting CPT 97605, it’s important to understand exactly what services are included in the code. Unlike surgical debridement or selective dressing changes, NPWT is a bundled service that covers multiple components in a single code.

CPT 97605 includes:

1. Comprehensive Wound Assessment

The provider evaluates:

• Wound size and depth
• Tissue type (granulation, slough, necrosis)
• Drainage
• Infection signs
• Progress since prior visit

This assessment is required at each session to justify continued NPWT.

2. Wound Preparation and Cleaning

This can include:

• Cleansing
• Removal of loose debris
• Irrigation
• Minor wound bed preparation

(It does not include debridement. If performed, debridement must be billed separately.)

3. Application of NPWT Dressing

This is a key component and includes:

• Foam or gauze selection
• Cutting dressing to fit
• Protecting the surrounding skin
• Packing tunnels or undermining when necessary

4. Pump Setup and Connection

The provider:

• Connects tubing
• Creates an airtight seal
• Ensures suction integrity
• Sets appropriate negative pressure levels
• Programs with intermittent or continuous therapy
• Ensures proper pump functioning

5. Instructions for Ongoing Care

Providers must educate the patient or caregiver on:

• Device operation
• Seal maintenance
• Alarm troubleshooting
• Dressing changes expectations
• Signs of complications

6. Documentation of Clinical Response

Because NPWT is ongoing therapy, documentation must show:

• Patient response
• Tissue improvement
• Drainage reduction
• Progress toward healing

All these elements are included under CPT 97605 during each billed session.

When Not to Use CPT 97605

Misusing CPT 97605 is one of the top causes of denied NPWT claims. It is important to know when this code does not apply so that alternative codes can be used appropriately.

Do Not Use CPT 97605 When:

1. The wound area is greater than 50 sq cm

Use CPT 97606 instead for wound(s) > 50 sq cm.

2. NPWT uses a disposable device

Disposable NPWT systems, such as PICO or SNAP, should be coded with:

• 97607 (≤ 50 sq cm)
• 97608 (> 50 sq cm)

DME and disposable NPWT systems cannot be billed together.

3. Routine dressing changes without NPWT

Standard wound care without vacuum therapy does not meet the criteria for CPT 97605.

4. NPWT does not meet medical necessity

If the wound is not appropriate for NPWT, or payer criteria (like Medicare LCDs) are not met, CPT 97605 should not be billed.

5. NPWT equipment is not DME

The system must be a qualifying durable device used over multiple days.

Avoiding incorrect code selection is essential to prevent denials and ensure compliance.

Measurement Rules for CPT 97605

Wound measurement is a vital part of proper NPWT coding. Payers require clear documentation of wound dimensions to justify the use of CPT 97605.

1. Measure the Wound Surface Area

Multiply: Length × Width (in cm)
Document the measurement during each session.

2. Total Measurement for Multiple Wounds

If treating more than one wound in the same session, combine the total surface area.

Example:
Wound 1: 20 sq cm
Wound 2: 25 sq cm
Total = 45 sq cm → CPT 97605

3. Use the most recent measurement

Measurements must reflect the wound size at the time of treatment, not from prior visits.

Accurate wound measurement helps justify ongoing therapy and ensures correct CPT code selection.

Documentation Requirements for CPT 97605

Documentation is the primary factor determining whether an NPWT claim is paid or denied. NPWT claims are frequently audited due to cost and long-term use, making complete documentation critical. Required Documentation Includes:

1. Wound Size

• Length, width, and, if relevant, depth
• Total surface area
• Measured in centimeters

2. Clinical Indications for NPWT

Examples include:

• Chronic diabetic foot ulcer
• Pressure ulcer stage III or IV
• Surgical wound with significant drainage
• Post-traumatic wound
• Infected wound requiring vacuum therapy

3. Type of DME NPWT System Used

Include equipment details such as:

• Pump model
• Foam or gauze type
• Pressure settings

4. Description of Procedure

• Wound cleansing
• Dressing applied
• Seal achieved
• Pump connection and function

5. Patient Education

Document that instructions were provided.

6. Physician Orders

NPWT requires direct physician involvement and orders.

7. Clinical Response

• Presence of granulation
• Decreased drainage
• Wound size reduction
• Fewer infection signs

8. Frequency

Indicate the number of visits (per session billing).

When documentation is incomplete, payers frequently deny 97605—even if NPWT was performed correctly.

Modifier Guidance for CPT 97605

Modifier usage for NPWT is generally minimal, but necessary when specific circumstances apply. Common Modifiers for 97605 are:

• RT / LT – For unilateral body sites
• F1–F9 / T1–T9 – Finger and toe locations
• Modifier 59 – Only when NPWT is performed at distinct sites separate from other same-day procedures

NPWT codes do not use modifier 51 (multiple procedures) because they are not surgical procedures.

Correct modifier use helps clarify the location, prevent bundling, and reduce claim rejections.

Billing & Reimbursement Tips for CPT 97605

NPWT billing requires careful attention to payer policies and documentation. Here are essential tips to improve claim success:

1. Verify Coverage

Medicare and private insurers often have:

• Specific clinical criteria
• Coverage limitations
• Medical necessity documentation requirements

2. Report the Correct CPT Code

Remember:

• 97605 = ≤ 50 sq cm
• 97606 = > 50 sq cm

3. Do Not Bill DME and Disposable NPWT Together

They are mutually exclusive systems.

4. Document Each Session Thoroughly

Missing wound measurements or dressing descriptions is a top denial reason.

5. Use Appropriate ICD-10 Codes

Common ICD-10 categories that pair appropriately with CPT 97605 include:

• Diabetic ulcers - Such as E11.621 or L97.xxx, reflecting ulcer location, depth, and presence of necrosis.
• Pressure ulcers - Including L89.xxx, specifying stage (II–IV), severity, and anatomical site.
• Non-healing or infected surgical wounds - Codes like T81.31XA or T81.4xxA, documenting complications following a procedure.
• Traumatic open wounds or lacerations - Using S31.xxx, S81.xxx, S91.xxx, etc., depending on location and complexity.

6. Follow Frequency Guidelines

Payers may limit how often NPWT can be billed (e.g., once per session).

7. Know Your MAC LCD Requirements

Medicare carriers have strict rules about:

• Duration of therapy
• Failed conservative treatment before NPWT
• Wound assessments

Staying compliant ensures proper payment.

Case Example for Correct Documentation and CPT 97605 Coding

Scenario:

A patient presents with:

• Lower leg wound: 28 sq cm
• Lateral ankle wound: 15 sq cm

Total = 43 sq cm

The provider performs:

• Wound assessment
• Cleansing and skin prep
• NPWT foam application
• Tubing setup
• Seal verification
• Pressure setting adjustments
• Patient instructions

Correct Coding: 97605 (≤ 50 sq cm total)

Documentation Must Include:

• Exact measurements of each wound: Lower leg wound measured 28 sq cm; lateral ankle wound measured 15 sq cm.
• Total combined area: The combined wound surface totalled 43 sq cm for coding.
• Type of NPWT system: DME NPWT pump documented by brand/model and confirmed as a non-disposable device.
• Dressing details: NPWT foam dressing applied with an airtight occlusive seal and properly connected tubing.
• Negative pressure level: System set to –125 mmHg continuous therapy with confirmed suction.
• Patient response: Patient tolerated treatment well with an effective seal, appropriate foam compression, and no complications.

For proper reimbursement and revenue cycle improvement, be sure to avoid mistakes leading to claim denials in medical billing.

Best Practices for NPWT Compliance

Implementing the following best practices helps ensure NPWT billing accuracy and compliance:

• Document Size at Every Visit - Never reuse old measurements.
• Explain Medical Necessity Clearly - Demonstrate why NPWT is needed beyond standard care.
• Maintain Detailed DME Records - Include pump type, pressure settings, and dressing materials.
• Avoid Upcoding - Use 97606 only when the total wound area exceeds 50 sq cm.
• Educate Staff on NPWT Requirements - Proper workflow reduces errors and supports compliance.
• Review Payer Policies Regularly - NPWT is highly regulated—policies are frequently updated.

Elevate NPWT Billing Performance With Summit RCM

CPT 97605 is essential for correctly reporting NPWT with DME on wounds 50 sq cm or less. Accurate measurement, clear documentation, and proper code selection help prevent denials, ensure compliance, and support clean, timely reimbursement.

For practices looking to strengthen their wound care billing accuracy and reduce denials, Summit RCM offers specialized wound care billing services designed to simplify the process and improve financial performance. Our experts understand NPWT coding, documentation requirements, and payer policies, ensuring your claims are submitted the first time.

Contact Summit RCM today to enhance your wound care billing workflows and maximize your reimbursement.