ICD-10-CM > H00-H59 > H30-H36 > H35 > H35.1 > H35.13 H35.13 Retinopathy of prematurity, stage 2 Non-Billable/Non-Specific Codes H35.131Retinopathy of prematurity, stage 2, right eyeH35.132Retinopathy of prematurity, stage 2, left eyeH35.133Retinopathy of prematurity, stage 2, bilateralH35.139Retinopathy of prematurity, stage 2, unspecified eye