Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99) ICD-10-CM
Chapter 17 of the ICD-10-CM classification spans codes Q00–Q99 and contains 1,066 diagnosis codes for congenital malformations, deformations and chromosomal abnormalities, of which 881 are billable. The chapter is organized into 11 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 11 ranges · 1,066 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About Chapter 17
ICD-10-CM Chapter 17 (Q00-Q99) covers congenital malformations, deformations, and chromosomal abnormalities present from birth that affect the body's structure and function.
This chapter includes a wide range of codes used to classify birth defects and genetic conditions that impact the development of organs, limbs, and bodily systems. Conditions such as heart malformations, cleft palate, and chromosomal disorders like Down syndrome are captured here. These codes help healthcare professionals document and communicate specific congenital issues for diagnosis, treatment planning, and health tracking. They are essential for identifying developmental abnormalities diagnosed in newborns or through prenatal screenings, supporting early intervention and specialized care.
In addition to structural malformations like skeletal or nervous system defects, the chapter also addresses inherited chromosomal abnormalities. These conditions often require multidisciplinary management, making precise coding important for coordinated medical care and specialized support services. Overall, Q00-Q99 codes provide detailed classification for congenital conditions that influence a patient's health throughout life.
Questions About This Page
How many codes are in the Q00-Q99 range?
The Q00-Q99 range contains 1,066 ICD-10-CM diagnosis codes in FY 2026. 881 of them are billable, and the rest are category headers that organize the chapter.
What conditions does Q00-Q99 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
