ICD-10-CM > H00-H59 > H15-H22 > H21 > H21.5 > H21.52 H21.52 Goniosynechiae Non-Billable/Non-Specific Codes H21.521Goniosynechiae, right eyeH21.522Goniosynechiae, left eyeH21.523Goniosynechiae, bilateralH21.529Goniosynechiae, unspecified eye