Q00Header code — not billable
Anencephaly and similar malformations
- Chapter
- 17. Congenital malformations, deformations and chromosomal abnormalities
- Category
- Q00
- Effective date
- October 1, 2026
Related codes in category Q00
Frequently asked questions
What is ICD-10 code Q00?
Q00 is an ICD-10-CM diagnosis code for Anencephaly and similar malformations.
Is Q00 a billable code?
No. Q00 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is Q00 in?
Q00 falls under Chapter 17: Congenital malformations, deformations and chromosomal abnormalities.
When did Q00 become effective?
Q00 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to Q00?
Q00 belongs to category Q00, which includes 3 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.