CPT code 66635 represents an ophthalmic surgical procedure to remove part of the iris to enlarge the pupil and improve vision. This anterior segment surgery can be clinically indicated for patients with restrictive pupil function that impairs visual acuity or access to other intraocular procedures. Nationally, accurate coding for this procedure affects clinical documentation, surgical quality tracking, and payer adjudication for ophthalmology services.

Key payers typically included in analyses are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides readers with an overview of the clinical context for CPT code 66635, expected sites of service, and common billing considerations. Benchmarks and payer coverage patterns are summarized where available; when specific data elements are missing in the input, the text notes that data are not available.

Readers will learn the clinical intent of the code, the typical service setting for the procedure, and which major national payers are relevant to coverage discussions. The content is intended for billing managers, ophthalmology clinicians, and policy analysts seeking a concise reference on coding and the procedural role of CPT code 66635 within ambulatory and hospital-based ophthalmic care.