2027 ICD-10-CM Diagnosis Code F78.A9Other genetic related intellectual disability

ICD-10-CM Codes›F01–F99›F70-F79›F78

ICD-10-CM F78.A9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

F78.A9 is a billable ICD-10-CM diagnosis code for other genetic related intellectual disability. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 884. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurodevelopmental disorders.

F78.A9 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 148 for payment year 2027.

Code Identity

ICD-10-CM Code
F78.A9
Billable Status
Yes — Valid for Submission
Code Describes
Other genetic related intellectual disability
Short Description
Other genetic related intellectual disability
Same as the full description in the CMS dataset.
Parent Code
F78.A
Other genetic related intellectual disabilities

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF70-F79Intellectual disabilities
CategoryF78Other intellectual disabilities
This CodeF78.A9Other genetic related intellectual disability

Medicare Risk Adjustment (HCC)Billing

F78.A9 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 148 — Mild or Unspecified Intellectual Disability/Developmental Disorder
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal blue sclerae
  • Abnormally short fourth metatarsal
  • Acromegaly
  • Agenesis of corpus callosum, intellectual disability, coloboma, micrognathia syndrome
  • AHDC1-related intellectual disability, obstructive sleep apnea, mild dysmorphism syndrome
  • Alacrima
  • Alopecia and intellectual disability with hypergonadotropic hypogonadism syndrome
  • Alopecia, contracture, dwarfism, intellectual disability syndrome
  • Alopecia, psychomotor epilepsy, periodontal pyorrhea, intellectual disability syndrome
  • Alpha thalassemia X-linked intellectual disability syndrome
  • Alpha-thalassemia intellectual disability syndrome linked to chromosome 16
  • Alport syndrome, intellectual disability, midface hypoplasia, elliptocytosis syndrome
  • Ambiguous genitalia
  • AMeD syndrome
  • Amelocerebrohypohidrotic syndrome
  • Aniridia and intellectual disability syndrome
  • Aniridia, ptosis, intellectual disability, familial obesity syndrome
  • ANK3-related intellectual disability, sleep disturbance syndrome
  • Ankyloblepharon
  • Ankylosis of joint of thumb
  • Anterior maxillary protrusion, strabismus, intellectual disability syndrome
  • Aortic arch anomaly, facial dysmorphism, intellectual disability syndrome
  • Aphonia, deafness, retinal dystrophy, bifid halluces, intellectual disability syndrome
  • Arachnoid cyst
  • Ataxia with deafness and intellectual disability syndrome
  • Atkin Flaitz syndrome
  • Autosomal dominant intellectual disability, craniofacial anomalies, cardiac defects syndrome
  • Autosomal dominant intellectual disability, craniofacial dysmorphism, macrocephaly, hypotonia syndrome due to H1-4 mutation
  • Autosomal recessive cerebellar ataxia, epilepsy, intellectual disability syndrome due to RUBCN deficiency
  • Autosomal recessive cerebellar ataxia, epilepsy, intellectual disability syndrome due to TUD deficiency
  • Autosomal recessive cerebellar ataxia, epilepsy, intellectual disability syndrome due to WWOX deficiency
  • Autosomal recessive intellectual disability, motor dysfunction, multiple joint contracture syndrome
  • BIDS brittle hair-impaired intellect-decreased fertility-short stature syndrome
  • Blepharophimosis, intellectual disability syndrome
  • Blepharophimosis, intellectual disability syndrome, Verloes type
  • Blepharophimosis, intellectual disability syndrome/genitopatellar overlap syndrome
  • Blue nevus of skin
  • Bone age finding
  • Brachymetatarsia
  • Brachymetatarsia of fourth metatarsal
  • Branchial dysplasia, intellectual disability, inguinal hernia syndrome
  • BRESEK syndrome
  • CAMOS syndrome
  • CASK related intellectual disability
  • Cataract, combined malonic and methylmalonic aciduria, intellectual disability syndrome
  • CCNK-related neurodevelopmental disorder, severe intellectual disability, facial dysmorphism syndrome
  • CDK13-related congenital heart defects, intellectual disability, facial dysmorphism syndrome
  • Central obesity
  • Cerebellar ataxia, intellectual disability, oculomotor apraxia, cerebellar cysts syndrome
  • CHAMP1-related intellectual disability, facial dysmorphism, behavioral abnormalities syndrome
  • Charcot-Marie-Tooth disease, deafness, intellectual disability syndrome
  • CHD3-related developmental delay, speech delay, intellectual disability, abnormalities of vision, facial dysmorphism syndrome
  • CHD4-related neurodevelopmental disorder
  • Christianson syndrome
  • CIMDAG syndrome
  • Clark Baraitser syndrome
  • CLCN4-related X-linked intellectual disability syndrome
  • Cleft palate, congenital heart defect, intellectual disability syndrome
  • Cohen Gibson syndrome
  • Coloboma, congenital heart disease, ichthyosiform dermatosis, intellectual disability ear anomaly syndrome
  • Colobomatous microphthalmia
  • Colobomatous microphthalmia, obesity, hypogenitalism, intellectual disability syndrome
  • Congenital absence of abdominal muscle
  • Congenital aniridia
  • Congenital ankyloblepharon
  • Congenital anomaly of aortic arch AND/OR descending aorta
  • Congenital anomaly of lacrimal gland
  • Congenital anomaly of sclera
  • Congenital anomaly of subcutaneous tissue
  • Congenital atresia of external auditory canal
  • Congenital atresia of external ear
  • Congenital atrophy of optic nerve
  • Congenital cataract with hypertrichosis and intellectual disability syndrome
  • Congenital coloboma of iris
  • Congenital cubitus valgus
  • Congenital dermal melanocytosis
  • Congenital generalized hypertrichosis
  • Congenital generalized lipodystrophy
  • Congenital hypoplasia of bone of radius and/or ulna
  • Congenital hypoplasia of cerebral hemisphere
  • Congenital hypoplasia of cerebral white matter
  • Congenital hypoplasia of external genitalia
  • Congenital hypoplasia of male external genitalia
  • Congenital hypoplasia of penis
  • Congenital hypoplasia of ulna
  • Congenital hypoplasia of ulna and intellectual disability syndrome
  • Congenital hypotrichia
  • Congenital ichthyosis, intellectual disability, spastic quadriplegia syndrome
  • Congenital intrauterine infection-like syndrome
  • Congenital keratoderma
  • Congenital laryngeal abductor palsy
  • Congenital malformation of angle of anterior chamber of eye
  • Congenital malformation of anterior pituitary
  • Congenital muscular dystrophy with intellectual disability
  • Congenital muscular dystrophy with intellectual disability and severe epilepsy
  • Congenital nephritis
  • Congenital osteodystrophy
  • Congenital prognathism
  • Congenital scalp aplasia cutis, enamel hypoplasia, developmental delay, intellectual disability syndrome
  • Constitutional aplastic anemia
  • Cooper Jabs syndrome
  • Cortical blindness
  • Cortical blindness, intellectual disability, polydactyly syndrome
  • Craniodigital syndrome and intellectual disability syndrome
  • Craniofacial dysplasia, short stature, ectodermal anomalies, intellectual disability syndrome
  • Crowding of teeth
  • Deafness and intellectual disability Martin Probst type syndrome
  • Deafness with onychodystrophy syndrome
  • Delayed bone age
  • Deletion of part of short arm of chromosome 16
  • Dentinogenesis imperfecta
  • Dentinogenesis imperfecta, short stature, hearing loss, intellectual disability syndrome
  • Developmental malformation of branchial arch
  • Dextrotransposition of aorta
  • Disorder of lysine and hydroxylysine metabolism
  • Dominant hereditary optic atrophy
  • DOORS syndrome
  • DYRK1A-related intellectual disability syndrome
  • Early onset parkinsonism and intellectual disability syndrome
  • Early-onset epilepsy, intellectual disability, brain anomalies syndrome
  • Early-onset epileptic encephalopathy, cortical blindness, intellectual disability, facial dysmorphism syndrome
  • Ectodermal dysplasia, intellectual disability, central nervous system malformation syndrome
  • EGF-related primary hypomagnesemia with intellectual disability
  • Epileptic encephalopathy
  • Essential tremor
  • Expressive dysphasia
  • Facial dysmorphism, hypertrichosis, epilepsy, intellectual disability/developmental delay, gingival overgrowth syndrome
  • Fallot complex with intellectual disability and growth delay syndrome
  • Familial psoriasis
  • Focal epilepsy, intellectual disability, cerebro-cerebellar malformation syndrome
  • Fragile X chromosome
  • FRAXE intellectual disability syndrome
  • Fryns Smeets Thiry syndrome
  • Genetic intellectual disability
  • Global developmental delay, intellectual disability, facial dysmorphism, pseudo Pelger-Huët anomaly syndrome
  • Global developmental delay, intellectual disability, microcephaly, short stature, brain iron accumulation syndrome
  • Global developmental delay, neuro-ophthalmological abnormalities, seizures, intellectual disability syndrome
  • GMS syndrome
  • GNB5-related intellectual disability, cardiac arrhythmia syndrome
  • Goldblatt Wallis syndrome
  • Goniodysgenesis
  • GRIN2A developmental and epileptic encephalopathy
  • GRIN2B-related developmental delay, intellectual disability, autism spectrum disorder
  • Growth delay, intellectual disability, hepatopathy syndrome
  • Hair defect with photosensitivity and intellectual disability syndrome
  • Hao Fountain syndrome
  • Hereditary congenital hypomelanotic and hypermelanotic cutaneous macules, growth retardation, intellectual disability syndrome
  • Hereditary elliptocytosis
  • Hereditary essential tremor
  • Hereditary persistence of fetal hemoglobin
  • Hereditary persistence of fetal hemoglobin, intellectual disability syndrome
  • Hereditary vasopressin-related polyuria
  • HIVEP2-related intellectual disability
  • Hyperactive behavior
  • Hyperphosphatasemia with intellectual disability
  • Hypohidrosis
  • Hypohidrosis, enamel hypoplasia, palmoplantar keratoderma, intellectual disability syndrome
  • Hypoplasia of corpus callosum
  • Hypotrichosis and intellectual disability syndrome Lopes type
  • Ichthyosis, alopecia, eclabion, ectropion, intellectual disability syndrome
  • Ichthyosis, intellectual disability, dwarfism, renal impairment syndrome
  • Infantile and/or juvenile cataract
  • Infantile neurodegeneration, progressive spasticity, intellectual disability, white matter lesions syndrome
  • Intellectual disability Birk-Barel type
  • Intellectual disability Buenos Aires type
  • Intellectual disability with strabismus syndrome
  • Intellectual disability, alacrima, achalasia syndrome
  • Intellectual disability, autism, speech apraxia, craniofacial dysmorphism syndrome
  • Intellectual disability, cardiac anomalies, short stature, joint laxity syndrome
  • Intellectual disability, cataract, calcified pinna, myopathy syndrome
  • Intellectual disability, coarse face, macrocephaly, cerebellar hypotrophy syndrome
  • Intellectual disability, craniofacial dysmorphism, cryptorchidism syndrome
  • Intellectual disability, cupped ears syndrome
  • Intellectual disability, developmental delay, contracture syndrome
  • Intellectual disability, early-onset cataract, microcephaly syndrome
  • Intellectual disability, epilepsy, bulbous nose syndrome
  • Intellectual disability, epilepsy, extrapyramidal syndrome
  • Intellectual disability, expressive aphasia, facial dysmorphism syndrome
  • Intellectual disability, facial dysmorphism syndrome due to SETD5 haploinsufficiency
  • Intellectual disability, facial dysmorphism, hand anomalies syndrome
  • Intellectual disability, hyperkinetic movement, truncal ataxia syndrome
  • Intellectual disability, hypoplastic corpus callosum, preauricular tag syndrome
  • Intellectual disability, hypotonia, brachycephaly, pyloric stenosis, cryptorchidism syndrome
  • Intellectual disability, macrocephaly, hypotonia, behavioral abnormalities syndrome
  • Intellectual disability, muscle weakness, short stature, facial dysmorphism syndrome
  • Intellectual disability, myopathy, short stature, endocrine defect syndrome
  • Intellectual disability, nasal speech, craniofacial dysmorphism syndrome
  • Intellectual disability, obesity, brain malformation, facial dysmorphism syndrome
  • Intellectual disability, obesity, prognathism, eye and skin anomalies syndrome
  • Intellectual disability, seizures, abnormal gait, facial dysmorphism syndrome
  • Intellectual disability, seizures, hypotonia, ophthalmologic, skeletal anomalies syndrome
  • Intellectual disability, spasticity, ectrodactyly syndrome
  • Intellectual disability, speech delay, dysmorphic features, T cell abnormalities syndrome
  • Juvenile cataract
  • Kawashima Tsuji syndrome
  • KBG syndrome
  • Keppen Lubinsky syndrome
  • L1 syndrome
  • Lamellar ichthyosis
  • Lanugo
  • Laryngeal abductor paralysis with intellectual disability syndrome
  • Late-onset localized junctional epidermolysis bullosa, intellectual disability syndrome
  • Leber's amaurosis
  • Left ventricular myocardial noncompaction cardiomyopathy
  • Lipodystrophy, intellectual disability, deafness syndrome
  • Localized junctional epidermolysis bullosa
  • Long face syndrome
  • Lysine demethylase 3B-related intellectual disability, facial dysmorphism, short stature syndrome
  • Macrocephaly and developmental delay syndrome
  • Macrocephaly, intellectual disability, autism syndrome
  • Macrocephaly, intellectual disability, left ventricular non compaction syndrome
  • Macrocephaly, intellectual disability, neurodevelopmental disorder, small thorax syndrome
  • Macroencephaly
  • Macrogyria
  • Male hypergonadotropic hypogonadism, intellectual disability, skeletal anomaly syndrome
  • Marfanoid habitus with autosomal recessive intellectual disability syndrome
  • Marfanoid physique
  • Martsolf syndrome
  • MASA syndrome
  • Mass of preauricular region
  • Maxillary jaw size anomaly
  • Maxillary prognathism
  • MECP2 duplication syndrome
  • MECP2 related disorder
  • MEDNIK syndrome
  • Megalocornea
  • Megalocornea with intellectual disability syndrome
  • MEHMO syndrome
  • Mesomelic dysplasia, digital anomalies, intellectual disability syndrome
  • Metaphyseal dysostosis, intellectual disability, conductive deafness syndrome
  • Microcephaly, corpus callosum and cerebellar vermis hypoplasia, facial dysmorphism, intellectual disability syndrome
  • Microcephaly, corpus callosum hypoplasia, intellectual disability, facial dysmorphism syndrome
  • Microcephaly, intellectual disability, sensorineural hearing loss, epilepsy, abnormal muscle tone syndrome
  • Microcephaly, short stature, intellectual disability, facial dysmorphism syndrome
  • Microcephaly, thin corpus callosum, intellectual disability syndrome
  • Microphthalmia with ankyloblepharon and intellectual disability syndrome
  • MOMO syndrome
  • MORM syndrome
  • Mowat-Wilson syndrome
  • Mowat-Wilson syndrome due to monosomy 2q22
  • Multiple congenital anomalies, neurodevelopmental delay, ocular abnormalities syndrome
  • MYT1L-related developmental delay, intellectual disability, obesity syndrome
  • Neck webbing
  • Neurodevelopmental delay, intellectual disability, ataxia, feeding difficulty syndrome
  • Non-progressive cerebellar ataxia with intellectual disability
  • Non-specific syndromic intellectual disability
  • Oliver syndrome
  • Open bite
  • Ophthalmological abnormalities, facial dysmorphism, intellectual disability syndrome
  • Optic atrophy, intellectual disability syndrome
  • Osteopenia, intellectual disability, sparse hair syndrome
  • Pachygyria, intellectual disability, epilepsy syndrome
  • Paresis of left lower limb
  • Paresis of right lower limb
  • Parkinson's disease
  • Partington syndrome
  • PDE4D haploinsufficiency syndrome
  • Periodontitis with genetic disorder
  • Perniola Krajewska Carnevale syndrome
  • PHIP-related behavioral problems, intellectual disability, obesity, dysmorphic features syndrome
  • Photosensitivity with ichthyosis, brittle hair, impaired intelligence, decreased fertility and short stature syndrome
  • Pinnal calcification
  • Pitt-Hopkins syndrome
  • Plagiocephaly
  • Postnatal microcephaly, infantile hypotonia, spastic diplegia, dysarthria, intellectual disability syndrome
  • PPM-X syndrome
  • Preaxial polydactyly, colobomata, intellectual disability syndrome
  • Prieto Badia Mulas syndrome
  • Primary hypomagnesemia, refractory seizures, intellectual disability syndrome
  • Primary testicular failure
  • Progressive essential tremor, speech impairment, facial dysmorphism, intellectual disability, abnormal behavior syndrome
  • Progressive spondyloepimetaphyseal dysplasia, short stature, short fourth metatarsals, intellectual disability syndrome
  • Prune belly syndrome
  • Prune belly syndrome with pulmonic stenosis, intellectual disability and deafness
  • Pterygium colli with intellectual disability and digital anomaly syndrome
  • PUM1-associated developmental disability, ataxia, seizure syndrome
  • Pyorrhea
  • QRICH1-related intellectual disability, chondrodysplasia syndrome
  • RAB18 deficiency
  • Rare non-syndromic intellectual disability
  • Recurrent encephalopathy
  • Recurrent metabolic encephalomyopathic crises, rhabdomyolysis, cardiac arrhythmia, intellectual disability syndrome
  • Retinitis pigmentosa, intellectual disability, deafness, hypogenitalism syndrome
  • Retinitis pigmentosa, juvenile cataract, short stature, intellectual disability syndrome
  • Richieri Costa-da Silva syndrome
  • Right aortic arch
  • Rud's syndrome
  • SCARF syndrome
  • Seizure, sensorineural deafness, ataxia, intellectual disability, electrolyte imbalance syndrome
  • Seizures and intellectual disability due to hydroxylysinuria
  • SETD2-related microcephaly, severe intellectual disability, multiple congenital anomalies syndrome
  • Severe global developmental delay
  • Severe growth deficiency, strabismus, extensive dermal melanocytosis, intellectual disability syndrome
  • Severe intellectual disability, agenesis of corpus callosum, facial dysmorphism, cerebellar ataxia syndrome
  • Severe intellectual disability, epilepsy, anal anomaly, distal phalangeal hypoplasia syndrome
  • Severe intellectual disability, hypotonia, strabismus, coarse face, planovalgus syndrome
  • Severe X-linked intellectual disability Gustavson type
  • Short stature, skeletal dysplasia, retinal degeneration, intellectual disability, sensorineural hearing loss syndrome
  • Short ulna, dysmorphism, hypotonia, intellectual disability syndrome
  • Skeletal dysplasia with intellectual disability syndrome
  • SLC12A2-related developmental delay, intellectual disability, sensorineural deafness syndrome
  • SMARCA2-related blepharophimosis, intellectual disability syndrome
  • Snyder-Robinson syndrome
  • Spastic paraplegia, glaucoma, intellectual disability syndrome
  • Spastic paraplegia, intellectual disability, nystagmus, obesity syndrome
  • Spastic paraplegia, intellectual disability, palmoplantar hyperkeratosis syndrome
  • Spastic tetraparesis
  • Spastic tetraplegia
  • Spastic tetraplegia, retinitis pigmentosa, intellectual disability syndrome
  • Speech delay
  • Spondyloepiphyseal dysplasia, craniosynostosis, cleft palate, cataract and intellectual disability syndrome
  • Spondyloepiphyseal dysplasia, sensorineural hearing loss, intellectual disability, Leber congenital amaurosis syndrome
  • STAG1-related intellectual disability, facial dysmorphism, gastroesophageal reflux syndrome
  • Structural abnormality of abdominal wall muscle
  • Syndromic X-linked intellectual disability due to JARID1C mutation
  • Syndromic X-linked intellectual disability type 11
  • Syndromic X-linked intellectual disability type 7
  • Talipes cavus
  • Tall stature, intellectual disability, renal anomalies syndrome
  • TBCK-related intellectual disability syndrome
  • TELO2-related intellectual disability, neurodevelopmental disorder
  • Tetralogy of Fallot
  • Tetraparesis
  • Third cranial nerve finding
  • Thumb stiffness, brachydactyly, intellectual disability syndrome
  • Trichothiodystrophy
  • Truncal ataxia
  • Urban Rogers Meyer syndrome
  • Uveal coloboma with cleft lip and palate and intellectual disability syndrome
  • Vasopressin deficiency
  • Ventricular myocardial noncompaction cardiomyopathy
  • Vertical maxillary excess
  • Weakness of bilateral lower limb
  • Weakness of left lower limb
  • Weakness of left upper limb
  • Weakness of right lower limb
  • Weakness of right upper limb
  • Wiedemann Steiner syndrome
  • Woodhouse Sakati syndrome
  • X-linked colobomatous microphthalmia, microcephaly, intellectual disability, short stature syndrome
  • X-linked epilepsy with learning disability and behavior disorder syndrome
  • X-linked female restricted facial dysmorphism, short stature, choanal atresia, intellectual disability
  • X-linked intellectual disability Abidi type
  • X-linked intellectual disability and epilepsy with progressive joint contracture and facial dysmorphism syndrome
  • X-linked intellectual disability and hypotonia with facial dysmorphism and aggressive behavior syndrome
  • X-linked intellectual disability Armfield type
  • X-linked intellectual disability Cabezas type
  • X-linked intellectual disability Cantagrel type
  • X-linked intellectual disability Cilliers type
  • X-linked intellectual disability due to GRIA3 mutations
  • X-linked intellectual disability Hedera type
  • X-linked intellectual disability hypotonic face syndrome
  • X-linked intellectual disability Nascimento type
  • X-linked intellectual disability Pai type
  • X-linked intellectual disability Schimke type
  • X-linked intellectual disability Seemanova type
  • X-linked intellectual disability Shrimpton type
  • X-linked intellectual disability Siderius type
  • X-linked intellectual disability Stevenson type
  • X-linked intellectual disability Stocco Dos Santos type
  • X-linked intellectual disability Stoll type
  • X-linked intellectual disability Turner type
  • X-linked intellectual disability Van Esch type
  • X-linked intellectual disability Wilson type
  • X-linked intellectual disability with acromegaly and hyperactivity syndrome
  • X-linked intellectual disability with ataxia and apraxia syndrome
  • X-linked intellectual disability with cerebellar hypoplasia syndrome
  • X-linked intellectual disability with cubitus valgus and dysmorphism syndrome
  • X-linked intellectual disability with hypogammaglobulinemia and progressive neurological deterioration syndrome
  • X-linked intellectual disability with marfanoid habitus
  • X-linked intellectual disability with plagiocephaly syndrome
  • X-linked intellectual disability with seizure and psoriasis syndrome
  • X-linked intellectual disability, cardiomegaly, congestive heart failure syndrome
  • X-linked intellectual disability, cerebellar hypoplasia, spondyloepiphyseal dysplasia syndrome
  • X-linked intellectual disability, craniofacioskeletal syndrome
  • X-linked intellectual disability, global development delay, facial dysmorphism, sacral caudal remnant syndrome
  • X-linked intellectual disability, hypogonadism, ichthyosis, obesity, short stature syndrome
  • X-linked intellectual disability, hypotonia, movement disorder syndrome
  • X-linked intellectual disability, limb spasticity, retinal dystrophy, arginine vasopressin deficiency
  • X-linked intellectual disability, macrocephaly, macroorchidism syndrome
  • X-linked intellectual disability, short stature, overweight syndrome
  • X-linked recessive intellectual disability and macrocephaly with ciliary dysfunction syndrome
  • X-linked sensorineural hearing loss
  • X-linked spasticity, intellectual disability, epilepsy syndrome
  • Young onset Parkinson disease

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F78.A9: its own notes plus those printed at block F70-F79 and Chapter 5. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block F70-F79 Intellectual disabilities applies to 7 codes
  • borderline intellectual functioning, IQ above 70 to 84 (R41.83)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Code First

The underlying condition named in the note is sequenced before this code.

From Block F70-F79 Intellectual disabilities applies to 7 codes
  • any associated physical or developmental disorders

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

  • if applicable, any associated disorders

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F78.A9, its category, or a range that includes it.

Applicable To 1

These notes mention F78.A9.

  • Z81.0 Family history of intellectual disabilities
    Conditions classifiable to F70-F79 names F70-F79, which includes this code

Excludes1 1

These codes carry an Excludes1 note naming F78.A9: they are not reported together with it, unless the two conditions are unrelated.

  • R41.83 Borderline intellectual functioning
    intellectual disabilities (F70-F79) names F70-F79, which includes this code

Excludes2 4

These codes carry an Excludes2 note naming F78.A9: its condition is not part of those codes, and both may be reported when the patient has both.

  • F80.0 Phonological disorder
    speech articulation impairment due to intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • F80.1 Expressive language disorder
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • F80.2 Mixed receptive-expressive language disorder
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • F82 Specific developmental disorder of motor function
    lack of coordination secondary to intellectual disabilities (F70-F79) names F70-F79, which includes this code

Code First 1

These codes say to code first a condition named in the note, and F78.A9 is one of the conditions named.

  • Z91.83 Wandering in diseases classified elsewhere
    intellectual disabilities (F70-F79) names F70-F79, which includes this code

Use Additional Code 5

These codes say to use an additional code from the note, and F78.A9 is one of the codes named.

  • E00 Congenital iodine-deficiency syndrome
    code (F70-F79) to identify associated intellectual disabilities. names F70-F79, which includes this code
  • Q87.87 Hao-Fountain Syndrome
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • Q87.88 CTNNB1 syndrome
    intellectual disability (F70-F79) names F70-F79, which includes this code
  • Q90 Down syndrome
    code(s) to identify any associated degree of intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • Q93.52 Phelan-McDermid syndrome
    degree of intellectual disabilities (F70-F79) names F70-F79, which includes this code

Code Also 4

These codes say F78.A9 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • G93.45 Developmental and epileptic encephalopathy
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • Q87.85 MED13L syndrome
    intellectual disability (F70-F79) names F70-F79, which includes this code
  • QA0 Neurodevelopmental disorders related to specific genetic pathogenic variants
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • Z15.1 Genetic susceptibility to epilepsy and neurodevelopmental disorders
    intellectual disabilities (F70-F79) names F70-F79, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD014
Neurodevelopmental disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

Code History & ChangesHistory

Replacement F78.A9 replaces the following previously assigned code(s):

  • F78 - Other intellectual disabilities
FY 2022AddedAdded to the ICD-10-CM code setEffective October 1, 2021.
FY 2023–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About F78.A9Overview

What is the ICD-10 code for other genetic related intellectual disability?

The ICD-10-CM code for other genetic related intellectual disability is F78.A9 (sometimes written as F78A9). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is F78.A9 (Other genetic related intellectual disabilities) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other genetic related intellectual disability on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does F78.A9 group to?

When other genetic related intellectual disability is the principal diagnosis on an inpatient stay, it groups to MS-DRG 884 (organic Disturbances and Intellectual Disability), which carries a relative weight of 1.5998. Higher weights mean higher Medicare reimbursement.

Can F78.A9 be reported with R41.83?

Not as a rule. The Excludes1 note at block F70-F79, which applies to F78.A9, lists "borderline intellectual functioning, IQ above 70 to 84 (R41.83)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does F78.A9 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: F78.A9 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 148 (Mild or Unspecified Intellectual Disability/Developmental Disorder).