For “anemia complicating pregnancy” in ICD‑10‑CM, the core code family is O99.0‑.

Quick Scoop

  • The general (non‑billable) category is O99.0 – Anemia complicating pregnancy, childbirth and the puerperium.
  • The specific (billable) codes for anemia complicating pregnancy by trimester are:
* **O99.011** – Anemia complicating pregnancy, first trimester
* **O99.012** – Anemia complicating pregnancy, second trimester

* **O99.013** – Anemia complicating pregnancy, third trimester
* **O99.019** – Anemia complicating pregnancy, unspecified trimester

In practice, you also typically add an additional code to specify the type of anemia (for example, iron deficiency anemia) from the D50–D64 range.

Mini notes for coders

  • Use O99.011–O99.013 when documentation clearly states the trimester.
  • Use O99.019 only when trimester is not documented or cannot be determined.
  • Remember that O99.0‑ is used when anemia is a maternal condition that complicates pregnancy , not when the focus is fetal effects.

Information gathered from public forums or data available on the internet and portrayed here.