Q93.1 Whole chromosome monosomy, mosaicism (mitotic nondisjunction)

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Risk adjustment (HCC)

• RxHCC V08: HCC 148 — Mild or Unspecified Intellectual Disability/Developmental Disorder

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Approximate ICD-9-CM (GEMs)

• 758.5 Other conditions due to autosomal anomalies (approximate)

Code annotations containing back-references to Q93.1

Back-references to Q93

• Code First: D84.81 Immunodeficiency due to conditions classified elsewhere ("chromosomal abnormalities (Q90-Q99)")
• Type 1 Excludes: E25 Adrenogenital disorders ("chromosomal abnormalities (Q90-Q99)")
• Type 1 Excludes: Z15 Genetic susceptibility to disease ("chromosomal anomalies (Q90-Q99)")

Diagnosis Index entries for Q93.1

• Monosomy › whole chromosome › mitotic nondisjunction
• Monosomy › whole chromosome › mosaicism

Nearby codes

• Q93 Monosomies and deletions from the autosomes, not elsewhere classified
• Q93.0 Whole chromosome monosomy, nonmosaicism (meiotic nondisjunction)
• Q93.1 Whole chromosome monosomy, mosaicism (mitotic nondisjunction) (this code)
• Q93.2 Chromosome replaced with ring, dicentric or isochromosome
• Q93.3 Deletion of short arm of chromosome 4
• Q93.4 Deletion of short arm of chromosome 5
• Q93.5 Other deletions of part of a chromosome
• Q93.51 Angelman syndrome