ICD-10-CM > H00-H59 > H30-H36 > H35 > H35.1 > H35.12 H35.12 Retinopathy of prematurity, stage 1 Non-Billable/Non-Specific Codes H35.121Retinopathy of prematurity, stage 1, right eyeH35.122Retinopathy of prematurity, stage 1, left eyeH35.123Retinopathy of prematurity, stage 1, bilateralH35.129Retinopathy of prematurity, stage 1, unspecified eye