H21.219 ICD-10-CM Code: Degeneration of chamber angle, unspecified eye

H21.219 is the ICD-10-CM diagnosis code for degeneration of chamber angle, unspecified eye. This code describes a deterioration or breakdown of the drainage system in the front part of the eye (the chamber angle) when the specific eye affected is not documented. The chamber angle is important for fluid drainage, and its degeneration can affect eye pressure and vision. H21.219 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of sclera, cornea, iris and ciliary body (h15-h22).

H21.219 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Use this code only when the medical record does not specify whether the condition affects the right eye, left eye, or both eyes; if laterality is documented, use the more specific codes H21.211 (right eye) or H21.212 (left eye).