ICD-10-CM > H00-H59 > H15-H22 > H21 > H21.5 > H21.50 H21.50 Unspecified adhesions of iris Non-Billable/Non-Specific Applicable To Synechia (iris) NOS Codes H21.501Unspecified adhesions of iris, right eyeH21.502Unspecified adhesions of iris, left eyeH21.503Unspecified adhesions of iris, bilateralH21.509Unspecified adhesions of iris and ciliary body, unspecified eye