ICD-10 Code H53.009 – Unspecified amblyopia, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H53.009 – Unspecified amblyopia, unspecified eye
What it is
This code identifies amblyopia, or “lazy eye,” when the affected eye is not specified. Use it when documentation confirms amblyopia but does not name the laterality or subtype.
Clinical signs
Typical findings include reduced visual acuity in one eye that is not fully explained by structural disease. Clinical features vary; refer to documentation.
When to use this code
Use H53.009 when the record states amblyopia and you cannot determine which eye is involved. It also fits when laterality is omitted in the note or report. If the provider documents a more specific amblyopia type or eye, code that instead.
Do not use for
Do not use this code for other causes of decreased vision, such as refractive error alone or ocular disease without amblyopia. Check documentation if the diagnosis is uncertain.
Coding tip
Look for laterality and amblyopia type in the assessment before defaulting to unspecified coding.