ICD-10 Code H35.129 – Retinopathy of prematurity, stage 1, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H35.129 – Retinopathy of prematurity, stage 1, unspecified eye
What it is
This code identifies stage 1 retinopathy of prematurity in an eye that is not specified as right or left. It refers to the mildest recognized stage of this retinal disorder in premature infants.
Clinical signs
Clinical features vary; refer to documentation. Stage 1 generally means a faint demarcation line is seen on retinal examination, without a raised ridge.
When to use this code
Use H35.129 when the record documents retinopathy of prematurity, stage 1, and does not identify which eye is affected. This is appropriate for ophthalmology notes, screening follow-up, or hospital records that specify stage 1 only. If laterality is documented, code the more specific eye.
Do not use for
Do not use this code for other stages of retinopathy of prematurity or for unspecified retinopathy without a documented stage. Check documentation if the note only says “ROP” or gives a different ocular disorder.
Coding tip
Confirm both stage and laterality before assigning H35.129; if either is missing, query the provider or use the documented unspecified option only.