Q92.1 Whole chromosome trisomy, mosaicism (mitotic nondisjunction)

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

Applies from Q92 Other trisomies and partial trisomies of the autosomes, not elsewhere classified

Includes

• unbalanced translocations and insertions

Excludes1 (never code together)

• trisomies of chromosomes 13, 18, 21 (Q90-Q91)

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 Q92.1

Back-references to Q92

• 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 Q92.1

• Trisomy (syndrome) › chromosome specified NEC › whole (nonsex chromosome) › mitotic nondisjunction
• Trisomy (syndrome) › chromosome specified NEC › whole (nonsex chromosome) › mosaicism
• Trisomy (syndrome) › whole chromosome › mitotic nondisjunction
• Trisomy (syndrome) › whole chromosome › mosaicism

Nearby codes

• Q92 Other trisomies and partial trisomies of the autosomes, not elsewhere classified
• Q92.0 Whole chromosome trisomy, nonmosaicism (meiotic nondisjunction)
• Q92.1 Whole chromosome trisomy, mosaicism (mitotic nondisjunction) (this code)
• Q92.2 Partial trisomy
• Q92.5 Duplications with other complex rearrangements
• Q92.6 Marker chromosomes
• Q92.61 Marker chromosomes in normal individual
• Q92.62 Marker chromosomes in abnormal individual