F78.A9
Other genetic related intellectual disability
F78.A9 (also written F78A9) is a billable ICD-10-CM diagnosis code for other genetic related intellectual disability. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 2 codes in category F78 (Other intellectual disabilities). The Alphabetic Index lists it under 22 entries. Its coding notes include a Code first instruction, a Code also instruction, 1 Excludes1 entry and 1 Excludes2 entry.
Code first
If the underlying condition listed here is present and known, sequence it first.
Also from chapter/block level (1 note)
- any associated physical or developmental disorders
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
- , if applicable, any associated disorders
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Behavioral Health clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026IPF Primary
IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:
| MS-DRG | Description | Factor |
|---|---|---|
| 884 | Organic disturbances & intellectual disabilities | 1.08 |
IPF Comorbidity
On the CMS IPF comorbidity list.
| Comorbidity category | Factor |
|---|---|
| Developmental Disabilities | 1.04 |
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- disorders of psychological development
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 22 entries
- Disability, disabilities, intellectual, autosomal dominant
- Disability, disabilities, intellectual, autosomal recessive
- Disability, disabilities, intellectual, genetic related
- Disability, disabilities, intellectual, genetic related, specified NEC
- Disability, disabilities, intellectual, genetic related, with, pathogenic CHAMP1 (variant)
- Disability, disabilities, intellectual, genetic related, with, pathogenic HNRNPH2 (variant)
- Disability, disabilities, intellectual, genetic related, with, pathogenic SATB2 (variant)
- Disability, disabilities, intellectual, genetic related, with, pathogenic SETBP1 (variant)
- Disability, disabilities, intellectual, genetic related, with, pathogenic STXBP1 (variant)
- Disability, disabilities, intellectual, in, autosomal dominant mental retardation
- Disability, disabilities, intellectual, in, autosomal recessive mental retardation
- Disability, disabilities, intellectual, in, SATB2-associated syndrome
Show 10 more
- Disability, disabilities, intellectual, in, SETBP1 disorder
- Disability, disabilities, intellectual, in, STXBP1 encephalopathy with epilepsy
- Disability, disabilities, intellectual, in, X-linked mental retardation (syndromic) (Bain type)
- Disability, disabilities, intellectual, specified level NEC
- Disability, disabilities, intellectual, with, pathogenic CHAMP1 (genetic) (variant)
- Disability, disabilities, intellectual, with, pathogenic HNRNPH2 (genetic) (variant)
- Disability, disabilities, intellectual, with, pathogenic SATB2 (genetic) (variant)
- Disability, disabilities, intellectual, with, pathogenic SETBP1 (genetic) (variant)
- Disability, disabilities, intellectual, with, pathogenic STXBP1 (genetic) (variant)
- Disability, disabilities, intellectual, X-linked (syndromic) (Bain type)