CPT code 0329T represents continuous ambulatory intraocular pressure (IOP) monitoring using a special lens-style device worn for a day or longer, with clinician interpretation and a formal report. This technology matters nationally as glaucoma and ocular hypertension are common causes of vision loss; objective, extended IOP data can improve clinical assessment and inform management decisions.

Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Coverage and coding practices for continuous IOP monitoring vary across commercial plans and Medicare; understanding how payers treat device placement, monitoring, and interpretation is critical for billing consistency.

Readers will learn the clinical context for ambulatory IOP monitoring, how CPT code 0329T maps to outpatient ophthalmology workflows, and what benchmarks and policy considerations commonly affect coverage and reimbursement. The publication summarizes typical sites of service, common billing modifiers used with monitoring and interpretation services, and items to consider when documenting device placement, monitoring duration, and interpretive reporting. Data not available in the input for payor-specific reimbursement rates, associated taxonomies, and ICD-10 diagnoses is noted where applicable.