ICD-10 Code F78.A9 – Other genetic related intellectual disability (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F78.A9 – Other genetic related intellectual disability
What it is
This code identifies intellectual disability linked to a genetic cause that does not fit a more specific category. Use it when documentation states a genetic-related intellectual disability and no narrower code is provided.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include below-average intellectual functioning and adaptive skill limitations, with a confirmed or suspected genetic association.
When to use this code
Use F78.A9 when the record clearly documents other genetic related intellectual disability and the provider does not name a more specific syndrome or subtype. It may appear in genetics, neurology, or developmental evaluations. If the chart only says “intellectual disability” without a genetic link, check documentation.
Do not use for
Do not use this code for intellectual disability with a known specific genetic syndrome that has its own diagnosis, or when the cause is not documented as genetic. Check documentation.
Coding tip
Match the code to the provider’s exact wording and confirm that a genetic relationship is documented.