HCPCS Level II code G0422 represents an intensive cardiac rehabilitation session, which may include continuous electrocardiographic monitoring during exercise. This code captures services for patients requiring a higher level of supervised rehabilitation than standard cardiac rehab and is relevant for facilities that provide structured, monitored exercise therapy following qualifying cardiac events or conditions. Nationally, intensive cardiac rehabilitation programs play a role in secondary prevention and functional recovery, and accurate coding is important for documentation and payer adjudication. Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and service setting, common payer coverage considerations, typical modifiers used for billing, and related policy points that affect claim processing. The publication also outlines benchmarks and utilization patterns where available, summaries of payer coverage approaches, and practical coding references to support correct claim submission. Data not available in the input is noted where applicable, and the report is intended for national audiences involved in revenue cycle, clinical program management, and policy review.