ICD-10 Code H35.121 – Retinopathy of Prematurity, Stage 1, Right Eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H35.121 – Retinopathy of prematurity, stage 1, right eye
What it is
This code identifies stage 1 retinopathy of prematurity in the right eye. It means there is a mild retinal change in a premature infant, limited to the right eye.
Clinical signs
Stage 1 retinopathy is defined by a thin demarcation line at the junction of vascular and avascular retina. Clinical features vary; refer to documentation.
When to use this code
Use H35.121 when the provider documents stage 1 retinopathy of prematurity affecting the right eye only. Apply it for ophthalmology follow-up, screening results, or specialist notes that clearly state this stage and laterality.
Do not use for
Do not use this code for other stages of retinopathy of prematurity, bilateral disease, or unspecified eye involvement. Check documentation if the record does not clearly identify stage 1 and the right eye.
Coding tip
Verify both the stage and the eye laterality before assigning the code.