What Is the 97610 CPT Code? A Billing Guide for MIST Therapy Wound Care

A wound care visit may be routine for the provider, but billing CPT 97610 can raise questions. The code is used for low-frequency, non-contact, non-thermal ultrasound and is commonly associated with MIST therapy for wounds.

The problem often starts when another wound procedure is performed during the same visit, documentation is incomplete, or payer rules differ. Knowing the 97610 CPT code description is only the first step, and the payer's rules before the claim goes out can save a lot of back-and-forth. 

What is the CPT code 97610

The 97610 CPT code is used to report low-frequency, non-contact, non-thermal ultrasound treatment for wound care. The service is commonly associated with MIST Therapy, which delivers low-frequency ultrasound through a saline mist without the applicator directly touching the wound bed.

The 97610 CPT code description includes the ultrasound treatment and, when performed, topical application, wound assessment, and instructions for ongoing care. Unlike many therapy codes reported in timed units, CPT 97610 is reported per day, with one unit representing the service provided on that date

When to Use CPT 97610 

CPT 97610 may be used when MIST therapy is appropriate for the patient’s wound and payer requirements are met. It is often considered when a wound is not healing as expected with regular wound care.

The medical record should explain why MIST therapy was used and show whether the wound is improving.

Medicare LCD WPS L37228 addresses MIST therapy and expects measurable improvement with continued treatment. This may include reduced wound size, less necrotic tissue, reduced pain, or improved granulation tissue after six treatments.

When Not to Use CPT 97610

CPT 97610 is not a general wound care code. Routine cleaning or dressing changes do not support it. When mist therapy for wounds is performed with debridement on the same wound and date, separate payment may not be allowed for codes such as CPT 97597, 97598, 11042, 11043, 11044, and 11045–11047. Check the applicable payer rules before billing both services.

For example, if CPT 11042 is reported for debridement of a foot ulcer and MIST therapy is then performed on that same ulcer, do not automatically add 97610 as a separate payable service. Review the applicable payer policy and the documentation for that encounter first.

The same applies to modifier 59. It should not be added simply to bypass a payer edit. The documentation must support that the services were distinct.

How to Bill CPT 97610 Code in Wound Care Billing

Billing CPT 97610 starts with confirming that the treatment actually supports the code. The note should clearly document low-frequency, non-contact, non-thermal ultrasound, not just say ultrasound treatment.

Before submitting the claim, check the patient's coverage and any payer rules for prior authorization, diagnosis, provider type, frequency limits, modifiers, and place of service.

Also review any other wound procedures performed on the same date. If MIST therapy and debridement codes such as 97597, 97598, 11042, 11043, or 11044 were used on the same wound, check payer bundling rules before reporting both.

CPT 97610 is not a standard 15-minute timed code, so longer treatment does not automatically support additional units.

The ICD-10-CM diagnosis should also match the wound documented in the medical record, including the type, location, laterality, stage, or severity when applicable. Practices can also review ICD-10 codes for wound care when checking the diagnosis.

Before the claim goes out, make sure the CPT code, diagnosis, units, modifiers, provider details, and supporting documentation all match.

Can You Bill CPT 97610 With Wound Debridement 

For Medicare, CPT 97610 may not be separately reportable when MIST therapy and wound debridement are performed on the same wound on the same day. This can apply to wound-care codes such as 97597, 97598, and 11042–11047. Before billing both services, review the payer's current billing rules to see whether both services can be reported separately.  A wound care coding cheat sheet can also help when reviewing related wound-care coding requirements.

What Changed for CPT 97610 in 2026

For 2026 billing, practices should work from current CMS and payer guidance rather than older online descriptions.

One particularly important point is the continued treatment of CPT 97610 as a per-day service. CMS wound-care guidance states that one 97610 service per day is allowable for a qualifying wound and addresses separate reporting when other active wound-care or debridement services are performed on the same wound.

Because Medicare coverage and billing policies can be revised, providers should verify the current MAC guidance that applies to their location before relying on older articles or archived policies.

Real-World Example: Billing MIST Therapy

A patient comes in for treatment of a chronic wound. The provider documents the wound size and condition, performs MIST therapy, and records the patient's response and follow-up plan. If the payer's requirements are met, the practice can report CPT 97610 with the appropriate diagnosis and documentation.

At the next visit, the provider performs debridement on that same wound before MIST therapy. The billing team should not automatically bill both services. They should first check the payer's rules to see whether CPT 97610 can be reported separately from the debridement on the same date.

A quick claim review can catch this before the claim is submitted and help avoid an unnecessary denial.

FAQ

What are the billing guidelines for CPT code 97610?

CPT 97610 is reported once per day for qualifying treatment. Check coverage, documentation, diagnosis, and same-day wound-care services before billing, as payer rules may differ.

What is the CPT code for MIST therapy?

CPT 97610 is the code used for MIST therapy involving low-frequency, non-contact, non-thermal ultrasound treatment for wound care. It is reported once per day.

Is MIST therapy covered by Medicare?

Yes, Medicare may cover MIST therapy when medical-necessity and coverage requirements are met. Coverage depends on the patient's wound, documentation, applicable Medicare policy, and local MAC rules.