CurrentBlue Cross Blue Shield - MassachusettsPolicy 657

Noncontact Low‑Frequency Ultrasound (NLFU) Therapy for Wounds — Coverage Criteria

This policy addresses coverage and prior authorization requirements for noncontact low-frequency ultrasound (NLFU) wound therapy for commercial members of Blue Cross Blue Shield Massachusetts. It governs inpatient preauthorization and outpatient coverage distinctions across managed care and indemnity/PPO products.

Policy Summary

PayerBlue Cross Blue Shield - Massachusetts

PolicyNoncontact Low‑Frequency Ultrasound (NLFU) Therapy for Wounds — Coverage Criteria

Policy CodePolicy 657

Change TypeNo material changes

Effective Date

Next Review Date

Key ActionObtain precertification/preauthorization for inpatient services described in this policy.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

Investigationalcoverage stance for NLFU

Outpatient not coveredoutpatient coverage stance

Preauthorization requiredinpatient authorization

97610CPT code used

Multiple RCTsevidence base

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Coverage Determinations

Coverage determinations

Policy coverage determinations

Investigational determination: Noncontact ultrasound treatment for wounds is considered investigational.

Applies to all wound types and commercial products; evidence is insufficient to determine improvement in net health outcome.

Outpatient commercial coverage: For Commercial Managed Care (HMO and POS), outpatient NLFU is not a covered service; for Commercial PPO and Indemnity, outpatient NLFU is not a covered service.

Outpatient services may be denied for lack of coverage.

Inpatient authorization: For services described in this policy, precertification/preauthorization is required for all products if the procedure is performed inpatient.

Authorization requirement does not indicate coverage; investigational status applies.

For Commercial members, outpatient noncontact low-frequency ultrasound (NLFU) therapy for wounds is not a covered service. Specifically, for Commercial Managed Care (HMO and POS) and for Commercial PPO and Indemnity products when billed outpatient, this service is explicitly not covered. Providers should expect outpatient claims for NLFU wound therapy to be denied for lack of coverage for these product lines.

Noncontact ultrasound treatment for wounds is considered investigational because the available evidence is insufficient to determine an improvement in net health outcome. Although multiple randomized controlled trials and systematic reviews have evaluated NLFU plus standard wound care, the trials have methodologic limitations — including a single double‑blinded, sham‑controlled trial with substantial flaws, lack of blinded outcome assessment in most RCTs, variable outcome measures (few reporting complete healing as primary outcome), and differences in intensity of standard care between groups — that limit confidence in the observed benefits. Consequently, the evidence does not establish that NLFU improves clinically meaningful outcomes such as complete wound healing.

Procedure and Billing Codes

CPT CodesCPT

97610

Low frequency, non-contact, non-thermal ultrasound, including topical application(s), when performed, wound assessment, and instruction(s) for ongoing care, per day

Provider Requirements and Billing Guidance

Prior Authorization

Prior Authorization Required

Precertification / Prior Authorization Required for Inpatient Services. For services described in this policy, precertification/preauthorization is required for all products if the procedure is performed inpatient. Failure to obtain required inpatient authorization may result in denial of payment or member liability.

Applies to all product types when performed inpatient
Obtain authorization prior to admission to avoid claim denials

Denial Risk

Outpatient Coverage Not Supported (Denial Risk)

Outpatient services — denial risk for Commercial products. Noncontact low-frequency ultrasound (NLFU) for wounds is not a covered service when performed outpatient for Commercial Managed Care (HMO and POS), PPO, and Indemnity products. Do not submit outpatient authorization requests for coverage; claims for outpatient NLFU are subject to denial.

Clinical Background

Ultrasound delivers mechanical vibration above the upper threshold of human hearing. Noncontact low‑frequency ultrasound (NLFU) operates in the kilohertz range (tens of kHz) and is delivered without direct contact to the wound surface. Some NLFU devices generate a saline mist that is conveyed to the wound while low‑frequency ultrasound is applied (examples include systems that operate around 35–40 kHz). The proposed mechanisms for wound healing include mechanical stimulation of tissues, microbubble effects, and enhanced debridement and cleansing; NLFU is intended as an adjunct to standard wound care, with trials focusing on outcomes such as time to complete wound closure and other clinically relevant healing measures.

Key Definitions and Devices

Noncontact low-frequency ultrasound (NLFU) — definition

DefinitionNoncontact low-frequency ultrasound (NLFU) — a form of therapeutic ultrasound that delivers mechanical vibration in the kilohertz range (>20 kHz) without direct contact to the wound, intended as an adjunct to standard wound care.

MechanismDelivers mechanical energy that may improve wound healing via production, vibration, and movement of micron-sized bubbles in the coupling medium and tissue.

Mode of deliveryDoes not require coupling gel or direct contact; transmits energy through a saline mist or sterile saline rather than a contact probe.

Intended useAdjunctive therapy to standard wound care for wound débridement, irrigation, and to potentially accelerate wound closure.

Evidence stancePolicy considers noncontact ultrasound treatment for wounds investigational due to insufficient evidence of improved net health outcome.

Policy Summary

PayerBlue Cross Blue Shield - Massachusetts

PolicyNoncontact Low‑Frequency Ultrasound (NLFU) Therapy for Wounds — Coverage Criteria

Policy CodePolicy 657

Change TypeNo material changes

Effective Date

Next Review Date

Key ActionObtain precertification/preauthorization for inpatient services described in this policy.

SourceLink

On This Page

Commercial Managed Care (HMO and POS), Outpatient = Not covered

Commercial PPO and Indemnity, Outpatient = Not covered

Documentation Required

Coding and Documentation Expectations

Provider action — coding and documentation expectations. Providers should report all services using the most up-to-date industry-standard procedure, revenue, and diagnosis codes, including modifiers where applicable. Include clinical documentation that supports medical necessity and details of the service provided.

Report procedure codes, diagnosis codes, revenue codes, and modifiers accurately
Retain documentation of wound assessment, topical applications (if any), and instructions for ongoing care

Billing Rule

Billing / CPT Code Guidance

Billing: CPT code guidance. When billing for non‑contact low‑frequency ultrasound, use the current procedure code(s) consistent with the service provided. Inclusion of a code does not guarantee coverage; verify member benefits.

CPT 97610 — Low frequency, non-contact, non-thermal ultrasound, including topical application(s), wound assessment, and instruction(s) for ongoing care, per day
Inclusion of CPT codes in policy text does not imply coverage; check member contract

Note

Provider Operational Actions

Provider action reminder (operational). Confirm benefit coverage and obtain any required inpatient authorization before delivering services. Document authorization numbers and keep authorization correspondence in the medical record to support claims.

Verify member's contract benefits at time of service
Record and retain authorization numbers for inpatient admissions

Examples and characteristics of NLFU devices

Example devicesMIST Therapy System; Qoustic Wound Therapy System.

Device characteristicsOperate in the low-frequency (kilohertz) range: MIST ~40 kHz; Qoustic ~35 kHz.

Delivery methodDeliver sterile saline or a saline mist to the wound while transmitting low-frequency ultrasound energy for débridement and irrigation.

Contact requirementDesigned as noncontact systems that do not require coupling gel or direct probe contact with the wound.

Clinical roleUsed to assist wound débridement and irrigation as an adjunct to standard wound care; clinical trials assess outcomes like wound closure and time to closure.