F79 Unspecified intellectual disabilities

Billable ICD-10-CM code, FY2026.

Applicable to

• Mental deficiency NOS
• Mental subnormality NOS

Applies from F79 Unspecified intellectual disabilities

Applicable to

• Mental deficiency NOS
• Mental subnormality NOS

Risk adjustment (HCC)

• RxHCC V08: HCC 148 — Mild or Unspecified Intellectual Disability/Developmental Disorder

MS-DRG index

Defines the logic of DRG(s) 884 in MDC 19.

Approximate ICD-9-CM (GEMs)

• 319 Unspecified intellectual disabilities (approximate)

Code annotations containing back-references to F79

Back-references to F79

• Use Additional: E00 Congenital iodine-deficiency syndrome ("code (F70-F79) to identify associated intellectual disabilities.")
• Type 2 Excludes: F80.0 Phonological disorder ("speech articulation impairment due to intellectual disabilities (F70-F79)")
• Type 2 Excludes: F80.1 Expressive language disorder ("intellectual disabilities (F70-F79)")
• Type 2 Excludes: F80.2 Mixed receptive-expressive language disorder ("intellectual disabilities (F70-F79)")
• Type 2 Excludes: F82 Specific developmental disorder of motor function ("lack of coordination secondary to intellectual disabilities (F70-F79)")
• Code Also: G93.45 Developmental and epileptic encephalopathy ("intellectual disabilities (F70-F79)")
• Code Also: Q87.85 MED13L syndrome ("intellectual disability (F70-F79)")
• Use Additional: Q87.87 Hao-Fountain Syndrome ("intellectual disabilities (F70-F79)")
• Use Additional: Q87.88 CTNNB1 syndrome ("intellectual disability (F70-F79)")
• Use Additional: Q90 Down syndrome ("code(s) to identify any associated degree of intellectual disabilities (F70-F79)")
• Use Additional: Q93.52 Phelan-McDermid syndrome ("degree of intellectual disabilities (F70-F79)")
• Code Also: QA0 Neurodevelopmental disorders related to specific genetic pathogenic variants ("intellectual disabilities (F70-F79)")
• Type 1 Excludes: R41.83 Borderline intellectual functioning ("intellectual disabilities (F70-F79)")
• Code Also: Z15.1 Genetic susceptibility to epilepsy and neurodevelopmental disorders ("intellectual disabilities (F70-F79)")
• Code First: Z91.83 Wandering in diseases classified elsewhere ("intellectual disabilities (F70-F79)")

Back-references to F79

• Use Additional: E00 Congenital iodine-deficiency syndrome ("code (F70-F79) to identify associated intellectual disabilities.")
• Type 2 Excludes: F80.0 Phonological disorder ("speech articulation impairment due to intellectual disabilities (F70-F79)")
• Type 2 Excludes: F80.1 Expressive language disorder ("intellectual disabilities (F70-F79)")
• Type 2 Excludes: F80.2 Mixed receptive-expressive language disorder ("intellectual disabilities (F70-F79)")
• Type 2 Excludes: F82 Specific developmental disorder of motor function ("lack of coordination secondary to intellectual disabilities (F70-F79)")
• Code Also: G93.45 Developmental and epileptic encephalopathy ("intellectual disabilities (F70-F79)")
• Code Also: Q87.85 MED13L syndrome ("intellectual disability (F70-F79)")
• Use Additional: Q87.87 Hao-Fountain Syndrome ("intellectual disabilities (F70-F79)")
• Use Additional: Q87.88 CTNNB1 syndrome ("intellectual disability (F70-F79)")
• Use Additional: Q90 Down syndrome ("code(s) to identify any associated degree of intellectual disabilities (F70-F79)")
• Use Additional: Q93.52 Phelan-McDermid syndrome ("degree of intellectual disabilities (F70-F79)")
• Code Also: QA0 Neurodevelopmental disorders related to specific genetic pathogenic variants ("intellectual disabilities (F70-F79)")
• Type 1 Excludes: R41.83 Borderline intellectual functioning ("intellectual disabilities (F70-F79)")
• Code Also: Z15.1 Genetic susceptibility to epilepsy and neurodevelopmental disorders ("intellectual disabilities (F70-F79)")
• Code First: Z91.83 Wandering in diseases classified elsewhere ("intellectual disabilities (F70-F79)")

Diagnosis Index entries for F79

• Development › tardy, mental
• Disability, disabilities › intellectual

Nearby codes

• F79 Unspecified intellectual disabilities (this code)