Neovascular secondary angle closure glaucoma, unsp

This code signifies a type of secondary glaucoma characterized by the formation of new, abnormal blood vessels (neovascularization) in the anterior chamber angle, leading to its closure and elevated intraocular pressure. This neovascularization often arises from underlying ischemic conditions, such as diabetic retinopathy or central retinal vein occlusion. The "unspecified eye" indicates that the laterality of the condition is not documented.

Use this code when documentation clearly states a diagnosis of neovascular secondary angle closure glaucoma without specifying whether it affects the right or left eye. This diagnosis is typically made following an ophthalmic examination revealing neovascularization of the iris and/or angle, synechiae, and elevated intraocular pressure. Supporting documentation would include ophthalmologist notes detailing funduscopic findings, gonioscopy results, and tonometry readings.

• Avoid using this code if the medical record specifies laterality (e.g., right eye, left eye, bilateral); instead, select the more specific H40.841 or H40.842.
• Always code the underlying cause of the neovascularization (e.g., diabetic retinopathy, central retinal vein occlusion) first, as it is the primary etiology.
• Ensure documentation explicitly states "angle closure" and "neovascular" to differentiate from other types of secondary glaucoma.