ICD-10 Code H28 – Cataract in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H28 – Cataract in diseases classified elsewhere
What it is
H28 identifies cataracts that occur as a result of another underlying disease, not as a primary eye disorder. Use it when documentation links the lens opacity to a separate condition.
Clinical signs
Typical findings include blurred vision, glare, halos, and reduced visual acuity from lens clouding. Clinical features vary; refer to documentation.
When to use this code
Use H28 when the provider states the cataract is secondary to another disease, such as a systemic or ocular condition. Code the underlying condition as well if documented and required by the record.
If the note only says “cataract” without a causal condition, check documentation before assigning H28. Make sure the record clearly supports the “in diseases classified elsewhere” wording.
Do not use for
Do not use H28 for age-related, traumatic, congenital, or drug-induced cataracts unless the documentation specifically supports a secondary cause. Check documentation.
Coding tip
Always verify the cause is documented, because H28 depends on an underlying disease being identified.