ICD-10 Code F78 – Other intellectual disabilities (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F78 – Other intellectual disabilities
What it is
F78 identifies intellectual disability that does not fit the specific categories of mild, moderate, severe, or profound. Use it when documentation clearly states another specified intellectual disability or when the subtype is not otherwise classified.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe below-average intellectual functioning with limitations in adaptive skills, but not enough detail to assign a more specific intellectual disability code.
When to use this code
Use F78 when the clinician documents “other intellectual disability,” “specified intellectual disability,” or a similar nonstandard subtype. It may also apply when the diagnosis is confirmed but the chart does not support a more specific category. Check documentation carefully before coding.
Do not use for
Do not use F78 for unspecified intellectual disability when the record lacks detail. Also avoid it if the documentation supports mild, moderate, severe, or profound intellectual disability instead.
Coding tip
Match the code to the exact wording in the assessment and avoid upgrading to F78 without explicit provider support.