Q99
Non-billableOther chromosome abnormalities, not elsewhere classified
Other chromosome abnormalities, not elsewhere classified
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 2
Conditions not included here, but the patient may have both
Child Codes (5)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(1)
Frequently Asked Questions
What is the ICD-10 code for other chromosome abnormalities, not elsewhere classified?
The ICD-10-CM code for other chromosome abnormalities, not elsewhere classified is Q99. The full clinical description is "Other chromosome abnormalities, not elsewhere classified". Q99 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code Q99 mean?
ICD-10-CM code Q99 represents “Other chromosome abnormalities, not elsewhere classified”. It is classified under Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities and is a non-billable header code. Use a more specific child code for billing purposes.
Is Q99 a billable code?
No, Q99 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 5 child codes under Q99.
What chapter is Q99 in?
Q99 is in Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities (codes Q00-Q99).
What are the subcategories under Q99?
Q99 has 5 child codes, including: Q99.0 (Chimera 46, XX/46, XY), Q99.1 (46, XX true hermaphrodite), Q99.2 (Fragile X chromosome), Q99.8 (Other specified chromosome abnormalities), and 1 more.
What are the UMLS CUIs for Q99?
Q99 is linked to 1 UMLS Concept Unique Identifier: C0495659. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does Q99 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like other chromosome abnormalities, not elsewhere classified affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of Q99?
Q99 maps to the ICD-11 code: LD7Z (Chromosomal anomalies, excluding gene mutations, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.