HCPCS Level II code S9129 designates occupational therapy delivered in the patient’s home and billed on a per diem basis. This code is relevant for payers and providers managing home-based rehabilitative care, especially for patients with mobility limitations or post-acute functional deficits. Nationally, home-based occupational therapy supports efforts to reduce institutional care and promote independence, making clear coding for per diem home services important for utilization tracking and payment policy.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical context, common clinical indications, and how it relates to time- or task-based therapy codes. The publication summarizes payer coverage scope, common modifiers used with home-based therapy billing, associated occupational therapy taxonomies, typical ICD-10 diagnoses seen with home OT services, and related therapy CPT codes commonly billed alongside home therapy.

The content provides benchmarks and policy-oriented details relevant to billing and claims review, clarifies clinical scenarios where per diem home occupational therapy is employed, and outlines connections to related procedure codes such as therapeutic exercises, therapeutic activities, neuromuscular reeducation, and self-care/home management training. Data not available in the input is noted where applicable.