O40Header code — not billable
Polyhydramnios
- Chapter
- 15. Pregnancy, childbirth and the puerperium
- Category
- O40
- Effective date
- October 1, 2026
Related codes in category O40
O40.1Polyhydramnios, first trimesterO40.1XX0Polyhydramnios, first trimester, not applicable or unspYesO40.1XX1Polyhydramnios, first trimester, fetus 1YesO40.1XX2Polyhydramnios, first trimester, fetus 2YesO40.1XX3Polyhydramnios, first trimester, fetus 3YesO40.1XX4Polyhydramnios, first trimester, fetus 4YesO40.1XX5Polyhydramnios, first trimester, fetus 5YesO40.1XX9Polyhydramnios, first trimester, other fetusYesO40.2Polyhydramnios, second trimesterO40.2XX0Polyhydramnios, second trimester, not applicable or unspYesO40.2XX1Polyhydramnios, second trimester, fetus 1YesO40.2XX2Polyhydramnios, second trimester, fetus 2Yes
Frequently asked questions
What is ICD-10 code O40?
O40 is an ICD-10-CM diagnosis code for Polyhydramnios.
Is O40 a billable code?
No. O40 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 O40 in?
O40 falls under Chapter 15: Pregnancy, childbirth and the puerperium.
When did O40 become effective?
O40 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to O40?
O40 belongs to category O40, 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.