ICD-10-CM > H00-H59 > H49-H52 > H52 > H52.2 > H52.21 H52.21 Irregular astigmatism Non-Billable/Non-Specific Codes H52.211Irregular astigmatism, right eyeH52.212Irregular astigmatism, left eyeH52.213Irregular astigmatism, bilateralH52.219Irregular astigmatism, unspecified eye