Q90.1

Trisomy 21, mosaicism (mitotic nondisjunction)

Billable / specificPOA exempt

Q90.1 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Includes (from Q90)

  • Note: Codes from this chapter are not for use on maternal records

Excludes2

Not included here — may be reported together when both conditions exist.

  • inborn errors of metabolism (E70-E88) (from Q90)
  • mitochondrial metabolic disorders (E88.4-) (from Q90)

Use additional code

Add a code to identify the following, if applicable.

  • code(s) to identify any associated degree of intellectual disabilities (F70-F79) (from Q90)

Code also

An additional code may be needed.

  • associated physical condition(s), such as atrioventricular septal defect (Q21.2-) (from Q90)

Also known as

  • Down syndrome, mitotic nondisjunction
  • Down syndrome, mosaicism
  • Syndrome, trisomy, 21, mitotic nondisjunction
  • Syndrome, trisomy, 21, mosaicism
  • Trisomy, 21, mitotic nondisjunction
  • Trisomy, 21, mosaicism

Parent code

  • Q90Down syndromeHeader

Related codes

  • Q90.0Trisomy 21, nonmosaicism (meiotic nondisjunction)Billable
  • Q90.2Trisomy 21, translocationBillable
  • Q90.9Down syndrome, unspecifiedBillable

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