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ICD-10-CM 2027

ICD-10 code for chorioamnionitis

O41.12

Chorioamnionitis

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Chorioamnionitis”. Page updated September 29, 2026.

About coding chorioamnionitis

The ICD-10-CM code for chorioamnionitis is O41.12 (Chorioamnionitis).

Within O41.1 (infection of amniotic sac and membranes), O41.12 is specifically for chorioamnionitis. Related codes cover unspecified (O41.10) and Placentitis (O41.14).

Codes in this range require a 7th character: 0 for not applicable or unspecified, 1 for fetus 1, 2 for fetus 2, 3 for fetus 3, 4 for fetus 4, 5 for fetus 5 and 1 more. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about chorioamnionitis ICD-10 codes

What is the ICD-10 code for chorioamnionitis?

O41.12 — Chorioamnionitis (a header code; report a more specific subcode).

Is O41.12 billable?

No. O41.12 is a header code. Report one of its more specific subcodes instead.