O36.821Header code — not billable
Fetal anemia and thrombocytopenia, first trimester
- Chapter
- 15. Pregnancy, childbirth and the puerperium
- Category
- O36
- Effective date
- October 1, 2026
Related codes in category O36
O36Maternal care for other fetal problemsO36.0Maternal care for rhesus isoimmunizationO36.01Maternal care for anti-D [Rh] antibodiesO36.011Maternal care for anti-D [Rh] antibodies, first trimesterO36.0110Maternal care for anti-D antibodies, first trimester, unspYesO36.0111Maternal care for anti-D antibodies, first tri, fetus 1YesO36.0112Maternal care for anti-D antibodies, first tri, fetus 2YesO36.0113Maternal care for anti-D antibodies, first tri, fetus 3YesO36.0114Maternal care for anti-D antibodies, first tri, fetus 4YesO36.0115Maternal care for anti-D antibodies, first tri, fetus 5YesO36.0119Maternal care for anti-D antibodies, first trimester, othYesO36.012Maternal care for anti-D [Rh] antibodies, second trimester
Frequently asked questions
What is ICD-10 code O36.821?
O36.821 is an ICD-10-CM diagnosis code for Fetal anemia and thrombocytopenia, first trimester.
Is O36.821 a billable code?
No. O36.821 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 O36.821 in?
O36.821 falls under Chapter 15: Pregnancy, childbirth and the puerperium.
When did O36.821 become effective?
O36.821 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to O36.821?
O36.821 belongs to category O36, which includes 12 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.