ICD-10-CM
ICD-10 code for Trisomy (syndrome) 21(partial): Q90.9
The ICD-10-CM index points "Trisomy (syndrome) 21(partial)" to Q90.9, Down syndrome, unspecified. Q90.9 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
More specific codes in Q90
A header groups codes and is not billed. A billable code is one you can report.
Code also
The CDC tabular list says a second code may be needed with this one. The note does not set which is listed first.
From Q90. A note on a category applies to every code under it.
Code also associated physical condition(s), such as atrioventricular septal defect (Q21.2-)
Use additional code
The CDC tabular list says to add the code named here after this one when it applies.
From Q90. A note on a category applies to every code under it.
Use additional code(s) to identify any associated degree of intellectual disabilities (F70-F79)
Related conditions
Related pages
- Q90.9 code detailsNotes, nearby codes, CMS-HCC group
- Category Q90Every code under it
- Chapter 17Congenital malformations and chromosomal abnormalities
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Trisomy (syndrome) 21(partial)?
The ICD-10-CM index points "Trisomy (syndrome) 21(partial)" to Q90.9, Down syndrome, unspecified. Q90.9 is a billable code.
Is Q90.9 billable?
Yes. Q90.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to Q90.9?
The CDC tabular list gives 1 "use additional code" note for Q90.9 and the categories above it. They are listed on this page.
What chapter is Q90.9 in?
Chapter 17. Congenital malformations and chromosomal abnormalities.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.