Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99) ICD-10-CM
Chapter 17 of the ICD-10-CM classification spans codes Q00–QA1 and contains 1,095 diagnosis codes for congenital malformations, deformations and chromosomal abnormalities, of which 900 are billable. The chapter is organized into 12 sections listed below, each linking to its code ranges and individual codes.
Chapter Coding Notes
Note: Codes from this chapter are not for use on maternal or fetal records
Excludes2: inborn errors of metabolism (E70-E88)
Sections in This Chapter 12 ranges · 1,095 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About Chapter 17
These conditions include differences in body structures present at birth, chromosomal abnormalities, and genetic disorders.
The blocks group congenital malformations by body system: nervous, circulatory, respiratory, digestive, genital, urinary, and musculoskeletal. Separate blocks cover the eye, ear, face, and neck, as well as cleft lip and cleft palate. The musculoskeletal block also includes deformations. The final blocks cover other congenital malformations, chromosomal abnormalities, and genetic disorders.
FY 2027 changes: The FY 2027 ICD-10-CM update, effective October 1, 2026, added 6 codes and deleted 2 codes in this chapter.
Questions About This Page
How many codes are in the Q00-QA1 range?
The Q00-QA1 range contains 1,095 ICD-10-CM diagnosis codes in FY 2027. 900 of them are billable, and the rest are category headers that organize the chapter.
What conditions does Q00-QA1 cover?
The range covers congenital malformations, deformations and chromosomal abnormalities. The sections listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
