Medical Clarified Coding for Ophthalmology: Bilateral Upper Lid Blepharoplasty In this blog, we break down the correct medical coding for bilateral upper lid blepharoplasty in ophthalmology, including how to report CPT 15822 once for a bilateral procedure and why you do not append modifier –50 or bill units = 2 when it’s documented as bilateral. We also explain how to assign ICD-10-CM laterality-specific diagnosis codes to support medical necessity based on documented bilateral upper eyelid derm