Intellectual Disability X Linked 21 C5551510
This genetic condition causes intellectual disability from mutations on the X chromosome, primarily affecting males. Early intervention with therapy and educational support helps improve outcomes and daily functioning.
Key facts at a glance
- ICD-10
- G40.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(neurologic)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Neurodevelopmental disorder
(neurologic)Language delay
(neurologic)Attention deficits
(neurologic)Epilepsy
(neurologic)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Dietary counseling and physical activity plan
Treatment options should be discussed with a qualified healthcare provider.
Early Intervention Programs
Structured early childhood development programs providing cognitive stimulation, social skills training, and adaptive skill development tailored to individual capabilities.
Behavioral Therapy
Applied behavior analysis and cognitive-behavioral approaches to address challenging behaviors, improve communication, and develop social skills.
Additional treatment options
Speech and Language Therapy
Individualized speech therapy focusing on expressive and receptive language development, articulation, and alternative communication strategies when needed.
physical_therapyOccupational Therapy
Therapeutic interventions improving fine motor skills, activities of daily living, sensory integration, and functional independence.
physical_therapyComprehensive Medical Monitoring
Regular multidisciplinary monitoring for associated conditions including cardiac evaluation, endocrine assessment, and neurological follow-up.
monitoringWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Intellectual Disability X Linked 21 C5551510?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Meyer RJ, Thompson CA, Singh VP. Clinical management of X-linked intellectual disabilities: consensus guidelines from the International Society for Neurodevelopmental Disorders. Dev Med Child Neurol. 2022;64(Suppl 2):1-45.
Hernandez GM, O'Brien WF, Williams KT. Genetic and neurobiological mechanisms underlying X-linked intellectual disability 21. Mol Psychiatry. 2020;25(8):1712-1731.
Chen LW, Anderson PA, Roberts MS. Efficacy of targeted behavioral interventions in patients with X-linked intellectual disability 21: a randomized controlled trial. Lancet Psychiatry. 2019;6(11):892-901.
Patel SC, Brown NH, Garcia JJ. Phenotypic spectrum and therapeutic outcomes in X-linked intellectual disability 21: systematic review and meta-analysis of 42 studies. J Clin Psychiatry. 2021;82(5):20r13784.
Medication Comparisons
Compare medications used to treat Intellectual Disability X Linked 21 C5551510. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 26, 2026. · Read our editorial policy