Short answer · Medically reviewed summary · Last updated: 2026-05-08
2q23.1 Microdeletion Syndrome does not have a unique, specific ICD-10 or ICD-9 code assigned to it due to its status as a rare chromosomal disorder. Clinicians typically use broader codes such as ICD-10 Q93.5 (Other deletions of part of a chromosome) or Q99.9 (Chromosomal abnormality, unspecified) to document the condition in medical records. Why is there no specific ICD code for 2q23.1 Microdeletion Syndrome? Because 2q23.1 Microdeletion Syndrome is a rare genetic condition involving the loss of a small segment of chromosome 2, it is often classified under general categories for chromosomal anomalies.
ICD10 code of 2q23.1 Microdeletion Syndrome and ICD9 code
ICD-10 and ICD-9 codes for 2q23.1 Microdeletion Syndrome, with classification details for clinicians, coders and patients.
2q23.1 Microdeletion Syndrome does not have a unique, specific ICD-10 or ICD-9 code assigned to it due to its status as a rare chromosomal disorder. Clinicians typically use broader codes such as ICD-10 Q93.5 (Other deletions of part of a chromosome) or Q99.9 (Chromosomal abnormality, unspecified) to document the condition in medical records.
Why is there no specific ICD code for 2q23.1 Microdeletion Syndrome?
Because 2q23.1 Microdeletion Syndrome is a rare genetic condition involving the loss of a small segment of chromosome 2, it is often classified under general categories for chromosomal anomalies. The medical community relies on these "umbrella" codes to ensure that patients can still receive insurance coverage and clinical documentation while waiting for more granular coding systems to be updated.
What are the clinical characteristics of 2q23.1 Microdeletion Syndrome?
2q23.1 Microdeletion Syndrome is primarily characterized by developmental delays, intellectual disability, and specific behavioral features. Patients often present with:
- Severe speech impairment or absence of speech.
- Distinctive facial features, such as a prominent forehead and thin upper lip.
- Growth delays, including microcephaly (small head size).
- Behavioral traits often described as "happy demeanor" or autistic-like features.
- Seizures or sleep disturbances in some individuals.
How is 2q23.1 Microdeletion Syndrome diagnosed?
Diagnosis of 2q23.1 Microdeletion Syndrome is typically achieved through chromosomal microarray analysis (CMA), which detects the submicroscopic deletion on the long arm of chromosome 2. This test is the gold standard for identifying the loss of the MBD5 gene, which is critical to the clinical presentation of 2q23.1 Microdeletion Syndrome.
Is 2q23.1 Microdeletion Syndrome inherited?
In the vast majority of cases, 2q23.1 Microdeletion Syndrome occurs de novo, meaning it is not inherited from either parent. A clinical geneticist can perform parental testing to confirm the origin of the deletion and provide accurate recurrence risk counseling for families.
Next steps
- Consult with a clinical geneticist to review microarray results and discuss family planning.
- Connect with the 4 community members registered at DiseaseMaps.org to share experiences and coping strategies.
- Coordinate with a multidisciplinary team including speech therapists, neurologists, and early intervention specialists.
Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD): 2q23.1 microdeletion syndrome.
- Orphanet: MBD5-associated neurodevelopmental disorder (MAND).
- OMIM (Online Mendelian Inheritance in Man): #612921 (MBD5-associated syndrome).
- Unique (Rare Chromosome Disorder Support Group): Guide to 2q23.1 deletions.
