F78.A1 – SYNGAP1-related intellectual disability

ICD-10-CM 2027 diagnosis code · Intellectual Disabilities

Billable code

ICD-10-CM code F78.A1

Code: F78.A1 (claims format: F78A1)
Description: SYNGAP1-related intellectual disability
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 5. Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
Block: F70-F79 Intellectual Disabilities
Parent codes: F78 › F78.A

Notes for F78.A1

Code also:

, if applicable, any associated:
autism spectrum disorder (F84.0)
autistic disorder (F84.0)
encephalopathy (G93.4-)
epilepsy and recurrent seizures (G40.-)
other pervasive developmental disorders (F84.8)
pervasive developmental disorder, NOS (F84.9)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block F70-F79

Excludes1 (not coded here):

borderline intellectual functioning, IQ above 70 to 84 (R41.83)

Code first:

any associated physical or developmental disorders

Index terms for F78.A1

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in F78.A

F78.A9 – Other genetic related intellectual disabilityBillable

Frequently asked questions

What is ICD-10 code F78.A1?

F78.A1 is the ICD-10-CM code for sYNGAP1-related intellectual disability, in the block F70-F79 (Intellectual Disabilities).

Is F78.A1 a billable code?

Yes. F78.A1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does F78.A1 belong to?

It belongs to category F78 – Other intellectual disabilities.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.