O45.021 — Premature separation of placenta with disseminated intravascular coagulation, first trimester
O45.021 is a billable, specific ICD-10-CM code for premature separation of placenta with disseminated intravascular coagulation, first trimester. It is valid for submission on a claim.
Other codes that can never be billed with O45.021
These codes carry an Excludes1 note pointing at O45.021. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading O45.021 alone.
Risk adjustment
O45.021 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
O45.021 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57189Billing and Coding: Serum Magnesium
Code history
O45.021 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share O45.02. If O45.021 is not quite right, the correct code is usually one of these.
- O45.022Premature separation of placenta with disseminated intravascular coagulation, second trimester
- O45.023Premature separation of placenta with disseminated intravascular coagulation, third trimester
- O45.029Premature separation of placenta with disseminated intravascular coagulation, unspecified trimester
Questions about O45.021
- Is O45.021 a billable ICD-10-CM code?
- Yes. O45.021 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does O45.021 sit in the tabular list?
- Pregnancy, childbirth and the puerperium (O00-O9A), in the block Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48).