ICD-10-CM > H00-H59 > H15-H22 > H21 > H21.2 > H21.21 H21.21 Degeneration of chamber angle Non-Billable/Non-Specific Codes H21.211Degeneration of chamber angle, right eyeH21.212Degeneration of chamber angle, left eyeH21.213Degeneration of chamber angle, bilateralH21.219Degeneration of chamber angle, unspecified eye