Trisomy 21, mosaicism (mitotic nondisjunction)

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2016 onwards.

What has happened to this code

Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

FY2007 Added to the draft code set draft Trisomy 21, mosaicism (mitotic nondisjunction)

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from Q90 Down syndrome

Use additional code

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

Code also

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

Inherited from the Q90-Q99 section Chromosomal abnormalities, not elsewhere classified (Q90-Q99)

Excludes2 - not included here

mitochondrial metabolic disorders (E88.4-)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Extra
Trifid
Triple
Additional
Triplication
Reduplication
Syndrome > Down
Duplication, duplex
Langdon Down syndrome
Additional > chromosome
Accessory > chromosome > 21
Additional > chromosome > 21
Duplication, duplex > chromosome NEC
Supernumerary > organ or site not listed
Redundant, redundancy > organ or site, congenital NEC
Trisomy > 21 > mosaicism
Down syndrome > mosaicism
Syndrome > trisomy > 21 > mosaicism
Trisomy > 21 > mitotic nondisjunction
Down syndrome > mitotic nondisjunction
Syndrome > trisomy > 21 > mitotic nondisjunction

Codes in the same group

Code	Description	Status
Q90.0	Trisomy 21, nonmosaicism (meiotic nondisjunction)	Valid
Q90.2	Trisomy 21, translocation	Valid
Q90.9	Down syndrome, unspecified	Valid