2026 ICD-10-CM Diagnosis Code F79Unspecified intellectual disabilities
ICD-10-CM Codes›F01–F99›F70-F79›F79
- Billable — Valid for Submission
- Chronic Condition
F79 is a billable ICD-10-CM diagnosis code for unspecified intellectual disabilities. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurodevelopmental disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- 11p partial monosomy syndrome
- ADNP-related multiple congenital anomalies, intellectual disability, autism spectrum disorder
- Arachnodactyly
- Arachnodactyly and intellectual disability with facial dysmorphism syndrome
- Arachnodactyly with abnormal ossification and intellectual disability syndrome
- Athetoid cerebral palsy
- Below average intellect
- Blepharophimosis, intellectual disability syndrome
- Blood magnesium below reference range
- Blood magnesium outside reference range
- Brachycephaly
- Brachydactyly, mesomelia, intellectual disability, heart defect syndrome
- Brain malformations, musculoskeletal abnormalities, facial dysmorphism, intellectual disability syndrome
- Combined malformation of central nervous system and skeletal muscle
- Congenital dysplasia of radius
- Congenital hepatic fibrosis
- Congenital nuclear ophthalmoplegia
- Congenital plicated tongue
- Cryptorchidism, arachnodactyly, intellectual disability syndrome
- Deletion of part of chromosome 11
- Deletion of part of chromosome 21
- Disorder of sex development with intellectual disability syndrome
- DYRK1A-related intellectual disability syndrome
- DYRK1A-related intellectual disability syndrome due to 21q22.13q22.2 microdeletion
- Dyskinetic cerebral palsy
- Genetic syndromic childhood obesity
- Hepatic fibrosis, renal cyst, intellectual disability syndrome
- Hypertelorism
- Hypogonadism with mitral valve prolapse and intellectual disability syndrome
- Intellectual disability
- Intellectual disability due to nutritional deficiency
- Intellectual disability Wolff type
- Intellectual disability, brachydactyly, Pierre Robin syndrome
- Intellectual disability, congenital heart disease, blepharophimosis, blepharoptosis and hypoplastic teeth
- Intellectual disability, craniofacial dysmorphism, hypogonadism, diabetes mellitus syndrome
- Intellectual disability, feeding difficulties, developmental delay, microcephaly syndrome
- Intellectual disability, polydactyly, uncombable hair syndrome
- Intellectual disability, seizures, macrocephaly, obesity syndrome
- Intellectual disability, severe speech delay, mild dysmorphism syndrome
- Intellectual disability, short stature, hypertelorism syndrome
- Intellectual functioning disability
- Kagami Ogata syndrome
- Low intelligence
- Mesomelic dysplasia of upper limb
- Microcephaly, seizure, intellectual disability, heart disease syndrome
- Micromelia
- Non-spastic cerebral palsy
- Ophthalmoplegia, intellectual disability, lingua scrotalis syndrome
- Osteogenesis imperfecta, retinopathy, seizures, intellectual disability syndrome
- Paralysis of tongue
- Pervasive developmental disorder with disorder of intellectual development with loss of previously acquired skills
- Pervasive developmental disorder with disorder of intellectual development without loss of previously acquired skills
- Plicated tongue
- Polyneuropathy, intellectual disability, acromicria, premature menopause syndrome
- Premature ovarian failure
- Primary hypomagnesemia, generalized seizures, intellectual disability, obesity syndrome
- Robin sequence
- Severe microbrachycephaly, intellectual disability, athetoid cerebral palsy syndrome
- WAGR syndrome
- White matter hypoplasia, corpus callosum agenesis, intellectual disability syndrome
- White Sutton syndrome
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Mental deficiency NOS
- Mental subnormality NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- tardy, mental - See Also: Disability, intellectual; - F79
- intellectual - F79
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Development
- tardy, mental
- Disability, disabilities
- intellectual
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Intellectual Disability
subnormal intellectual functioning which originates during the developmental period. this has multiple potential etiologies, including genetic defects and perinatal insults. intelligence quotient (iq) scores are commonly used to determine whether an individual has an intellectual disability. iq scores between 70 and 79 are in the borderline range. scores below 67 are in the disabled range. (from joynt, clinical neurology, 1992, ch55, p28)X-Linked Intellectual Disability
a class of genetic disorders resulting in intellectual disability that is associated either with mutations of genes located on the x chromosome or aberrations in the structure of the x chromosome (sex chromosome aberrations).Hypertelorism
abnormal increase in the interorbital distance due to overdevelopment of the lesser wings of the sphenoid.Arachnodactyly
an abnormal bone development that is characterized by extra long and slender hands and fingers, such that the clenched thumb extends beyond the ulnar side of the hand. arachnodactyly can include feet and toes. arachnodactyly has been associated with several gene mutations and syndromes.WAGR Syndrome
a contiguous gene syndrome associated with hemizygous deletions of chromosome region 11p13. the condition is marked by the combination of wilms tumor; aniridia; genitourinary abnormalities; and intellectual disability.Congenital Hepatic Fibrosis
a congenital disorder usually inherited in an autosomal recessive pattern. it affects the hepatobiliary system and the kidneys. it is characterized by liver fibrosis, portal hypertension, and renal cysts.
Patient EducationClinical
Developmental Disabilities
Developmental disabilities are conditions that are usually present at birth. They can affect a child's growth and development. These conditions can cause physical, learning, language, or behavior issues. They can include:
The full article covers:
- What are developmental disabilities?
- What causes developmental disabilities?
- How are developmental disabilities diagnosed?
- What are the treatments for developmental disabilities?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert F79 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About F79Overview
Is F79 (Unspecified intellectual disabilities) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified intellectual disabilities on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of F79?
Under the General Equivalence Mappings, unspecified intellectual disabilities converts to ICD-9-CM 319 (intellect disability NOS). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
