ICD-10-CM > H00-H59 > H15-H22 > H21 > H21.5 > H21.51 H21.51 Anterior synechiae (iris) Non-Billable/Non-Specific Codes H21.511Anterior synechiae (iris), right eyeH21.512Anterior synechiae (iris), left eyeH21.513Anterior synechiae (iris), bilateralH21.519Anterior synechiae (iris), unspecified eye