Q99 ICD-10-CM Code: Other chromosome abnormalities, not elsewhere classified
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
Q99Other chromosome abnormalities, not elsewhere classified
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where Q99 sits
- 1
Chapter 17
Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- 2
Section
Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
- 3
Category Q99
Other chromosome abnormalities, not elsewhere classified
- 4
Code Q99
Other chromosome abnormalities, not elsewhere classified
More specific choices
Codes under Q99
Q99 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for Q99.
Code first
No “code first” instruction is listed for Q99.
Use additional code
No “use additional code” instruction is listed for Q99.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for Q99.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for Q99.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code Q99 mean?
Q99 is the FY 2027 U.S. ICD-10-CM code for “Other chromosome abnormalities, not elsewhere classified.”
Is Q99 a billable or specific ICD-10-CM code?
No. Q99 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is Q99 located in ICD-10-CM?
Q99 is listed in Chapter 17, Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1), within Chromosomal abnormalities, not elsewhere classified (Q90-Q99) (Q90–Q99), under category Q99, Other chromosome abnormalities, not elsewhere classified.
What coding notes are listed for Q99?
No inclusion terms are listed for Q99 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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