Summary & Overview
CPT 97035: Therapeutic Ultrasound Application, 15-Minute Increments
CPT 97035 covers the application of therapeutic ultrasound in 15-minute increments, a commonly used physical therapy modality for soft tissue pain and musculoskeletal conditions. Nationally, this code is relevant because ultrasound remains a routine adjunct in outpatient rehabilitation across diverse diagnoses and care pathways. The code’s time-based reporting and frequent pairing with therapeutic exercise and manual therapy make it a focal point for billing, coverage, and utilization discussions. Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the code’s clinical context, typical billing patterns, and payer coverage considerations. The publication outlines common clinical uses, how CPT 97035 interfaces with related physical therapy CPTs such as 97110 and 97140, and common modifiers used in practice. It also provides benchmarking information for utilization and frequency in outpatient physical therapy, notes on documentation elements that typically accompany time-based modalities, and summaries of payer-specific coverage themes where available. Data gaps are identified where input was not provided. This summary is intended to inform clinicians, billing staff, and policy analysts about the operational and reimbursement landscape surrounding therapeutic ultrasound in outpatient physical therapy.
CPT Code Overview
CPT 97035 describes the application of therapeutic ultrasound as a modality to one or more areas, reported in 15-minute time increments. This service is delivered as part of physical therapy care and is typically provided in an office (POS 11) setting.
Clinical & Coding Specifications
Clinical Context
A patient presents to an outpatient physical therapy clinic with localized musculoskeletal pain (for example, low back pain or unilateral knee pain). After an initial evaluation by a licensed physical therapist, the plan of care includes therapeutic modalities to reduce pain and promote tissue healing. During a treatment visit, therapeutic ultrasound is applied to one or more affected areas in 15-minute increments as part of a supervised physical therapy session. The workflow typically includes patient check-in, brief reassessment, documentation of the modality applied and time spent, concurrent or subsequent active therapeutic exercises or manual therapy as indicated, and documentation of response to the ultrasound intervention.
Coding Specifications
Modifier 59 - Distinct Procedural Service:
- Use when the ultrasound procedure is distinct and independent from other services performed on the same day (for example, when medically necessary and separately identifiable from other therapeutic procedures).
Modifier GP - Services delivered under an outpatient physical therapy plan of care:
- Indicates the service is provided under an outpatient physical therapy plan of care and is commonly reported with outpatient PT services.
Associated provider taxonomies:
-
Physical Therapist (
225100000X) — represents licensed physical therapists who evaluate and manage the PT plan of care and often provide or supervise therapeutic modalities. -
Physical Therapy Assistant () — represents licensed PT assistants who may provide components of the plan of care under the supervision of a physical therapist.