ICD-10-CM diagnosis code
Q93.1 Whole chromosome monosomy, mosaicism (mitotic nondisjunction)
- Billable
- Yes, a complete code (FY2026)
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Other codes in Q93
14 complete codes in this category.
- Q93.0Whole chromosome monosomy, nonmosaicism (meiotic nondisjunction)
- Q93.1Whole chromosome monosomy, mosaicism (mitotic nondisjunction)
- Q93.2Chromosome replaced with ring, dicentric or isochromosome
- Q93.3Deletion of short arm of chromosome 4
- Q93.4Deletion of short arm of chromosome 5
- Q93.51Angelman syndrome
- Q93.52Phelan-McDermid syndrome
- Q93.59Other deletions of part of a chromosome
- Q93.7Deletions with other complex rearrangements
- Q93.81Velo-cardio-facial syndrome
- Q93.82Williams syndrome
- Q93.88Other microdeletions
Documentation tips
- Make sure the note supports every element of the title, “Whole chromosome monosomy, mosaicism (mitotic nondisjunction)”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to Q93.
The international WHO ICD-10 also has Q93.1, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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