ICD-10 Code F78.A – Other genetic related intellectual disabilities (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F78.A – Other genetic related intellectual disabilities
What it is
Use this code for intellectual disability attributed to a genetic cause when the specific syndrome or genetic condition is not otherwise classified. It indicates a documented genetic relationship, not just developmental delay.
Clinical signs
Clinical features vary; refer to documentation. Typical records describe impaired intellectual functioning with limitations in adaptive behavior, and may note developmental delays or a known genetic abnormality.
When to use this code
Use F78.A when the provider documents intellectual disability linked to a genetic condition, but no more specific ICD-10-CM code applies. It may also fit when the chart states a genetic etiology without naming a defined syndrome. Check documentation for the exact diagnosis and coding hierarchy.
Do not use for
Do not use this code for intellectual disability without a documented genetic cause. Also avoid it when a more specific genetic syndrome or chromosomal disorder is identified and coded elsewhere.
Coding tip
Code the most specific genetic diagnosis available first, and use F78.A only when the record supports a nonspecific genetic-related intellectual disability.