Question: Thank you for your article about glaucoma screenings – we read it and had a follow-up question. In the article, you mention that Z13.5 isn’t an appropriate code for a glaucoma diagnosis. What should we use instead? Arkansas Subscriber Answer: You should only report ICD-10 code Z13.5 (Encounter for screening for eye and ear disorders) on your glaucoma screening claims, meaning the claims that you submit to screen healthy patients for this condition. If your patient already has glaucoma, you will instead report the definitive diagnosis code for the exact type of glaucoma they have. The main category of glaucoma codes is H40-H42 (Glaucoma). This category includes about 250 codes, some of which stretch to seven characters. The seventh character represents the stage of the glaucoma, as follows: For instance, if the patient presents with primary open-angle glaucoma of the right eye in the moderate stage, you’d report H40.1112 (Primary open-angle glaucoma, right eye, moderate stage).