Other intellectual disabilities (F78) ICD-10-CM
The F78 code range covers other intellectual disabilities with 4 ICD-10-CM diagnosis codes. 2 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the F78 Range 4 codes · 2 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the F78 range.
Acromegaly
A condition caused by prolonged exposure to excessive HUMAN GROWTH HORMONE in adults. It is characterized by bony enlargement of the FACE; lower jaw (PROGNATHISM); hands; FEET; HEAD; and THORAX. The most common etiology is a GROWTH HORMONE-SECRETING PITUITARY ADENOMA. (From Joynt, Clinical Neurology, 1992, Ch36, pp79-80)
Craniosynostoses
Premature closure of one or more CRANIAL SUTURES. It often results in plagiocephaly. Craniosynostoses that involve multiple sutures are sometimes associated with congenital syndromes such as ACROCEPHALOSYNDACTYLIA; and CRANIOFACIAL DYSOSTOSIS.
Dentinogenesis Imperfecta
An autosomal dominant disorder of tooth development characterized by opalescent dentin resulting in discoloration of the teeth. The dentin develops poorly with low mineral content while the pulp canal is obliterated.
Essential Tremor
A relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. The tremor is usually mild, but when severe may be disabling. An autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (Mov Disord 1988;13(1):5-10)
Growth Hormone-Secreting Pituitary Adenoma
A pituitary tumor that secretes GROWTH HORMONE. In humans, excess HUMAN GROWTH HORMONE leads to ACROMEGALY.
Hypohidrosis
Abnormally diminished or absent perspiration. Both generalized and segmented (reduced or absent sweating in circumscribed locations) forms of the disease are usually associated with other underlying conditions.
Lumbosacral Region
Region of the back including the LUMBAR VERTEBRAE, SACRUM, and nearby structures.
Mongolian Spot
A bluish-gray to gray-brown benign, melanocytic nevus found usually in the LUMBOSACRAL REGION of dark-skinned people, especially those of East Asian ancestry. It is usually congenital or appears shortly after birth, and disappears in childhood.
Open Bite
A condition in which certain opposing teeth fail to establish occlusal contact when the jaws are closed.
Plagiocephaly
The condition characterized by uneven or irregular shape of the head often in parallelogram shape with a flat spot on the back or one side of the head. It can either result from the premature CRANIAL SUTURE closure (CRANIOSYNOSTOSIS) or from external forces (NONSYNOSTOTIC PLAGIOCEPHALY).
Plagiocephaly, Nonsynostotic
A deformity of the SKULL that is not due to bone fusion (SYNOSTOSIS), such as craniosynostoses, and is characterized by an asymmetric skull and face. It is observed with an increased frequency in INFANTS after the adoption of supine sleeping recommendations to prevent SUDDEN INFANT DEATH SYNDROME.
Prune Belly Syndrome
A syndrome characterized by abdominal wall musculature deficiency, cryptorchism, and urinary tract abnormalities. The syndrome derives its name from its characteristic distended abdomen with wrinkled skin.
Talipes Cavus
A foot deformity in which the arch of the foot is high and often the heel adducted.
Tetralogy of Fallot
A combination of congenital heart defects consisting of four key features including VENTRICULAR SEPTAL DEFECTS; PULMONARY STENOSIS; RIGHT VENTRICULAR HYPERTROPHY; and a dextro-positioned AORTA. In this condition, blood from both ventricles (oxygen-rich and oxygen-poor) is pumped into the body often causing CYANOSIS.
About the F78 Code Range
The ICD-10 code F78 and its subcategories classify a range of intellectual disabilities that do not fit into commonly defined categories, including those with genetic origins. These codes are specifically used for identifying "Other intellectual disabilities," particularly those linked to rare or less common genetic conditions.
F78 covers intellectual disabilities outside standard classifications, while F78.A and its detailed subcodes like F78.A1 (SYNGAP1-related intellectual disability) pinpoint genetic causes of intellectual impairment. These codes assist in documenting complex neurodevelopmental disorders with unique genetic backgrounds, often associated with syndromes such as X-linked intellectual disability types and other rare genetic syndromes outlined under F78.A9. Using these ICD-10 codes helps healthcare professionals and coders differentiate between general intellectual disabilities and those caused by specific genetic variations or syndromes, clarifying diagnoses for treatment planning and data recording. This precise classification supports the medical coding process by linking various synonyms and genetic syndromes to appropriate codes, ensuring accurate health records and facilitating research focused on these specialized neurodevelopmental disorders.
Questions About This Page
How many billable codes are in the F78 range?
Of the 4 codes in this range, 2 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the F78 range classify?
The range classifies other intellectual disabilities. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
