HCPCS Level II code S0812 designates phototherapeutic keratectomy (PTK), an excimer-laser corneal surface procedure used to remove superficial corneal pathology such as recurrent erosions, superficial scars, and certain dystrophies. Nationally, this procedure matters because it addresses visual impairment and symptomatic corneal disease that often require outpatient surgical care and coordination between ophthalmology providers and payers. Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn the clinical context of PTK, typical sites of service, and the payer landscape relevant to coverage and billing practices. The publication summarizes common modifiers observed for surgical ophthalmology, highlights where data is not available in the input, and outlines the types of benchmarks and policy updates that would be relevant for stakeholders. This summary is intended to help revenue cycle managers, coding professionals, and policy analysts quickly understand what S0812 represents, which payers are typically involved, and what additional data elements (utilization benchmarks, authorization requirements, and diagnosis linkage) are commonly sought when assessing PTK billing across the national market.