Chapter 15

O00–O9A: Pregnancy, Childbirth and the Puerperium

Pregnancy, Childbirth and the Puerperium diagnostic classification updated for 2026.

Chapter Instructions

Excludes1(Not coded here. Use a different code.)

supervision of normal pregnancy (Z34.-)

Excludes2(Not included here. Code separately if applicable.)

mental and behavioral disorders associated with the puerperium (F53.-)
obstetrical tetanus (A34)
postpartum necrosis of pituitary gland (E23.0)
puerperal osteomalacia (M83.0)

Use Additional Code

code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

All Codes Billable Only

Internal Codes

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O41.129|
Chorioamnionitis, unspecified trimester
O41.1290|
Chorioamnionitis, unspecified trimester, not applicable or unspecified
O41.1291|
Chorioamnionitis, unspecified trimester, fetus 1
O41.1292|
Chorioamnionitis, unspecified trimester, fetus 2
O41.1293|
Chorioamnionitis, unspecified trimester, fetus 3
O41.1294|
Chorioamnionitis, unspecified trimester, fetus 4
O41.1295|
Chorioamnionitis, unspecified trimester, fetus 5
O41.1299|
Chorioamnionitis, unspecified trimester, other fetus
O41.14|
Placentitis
O41.141|
Placentitis, first trimester
O41.1410|
Placentitis, first trimester, not applicable or unspecified
O41.1411|
Placentitis, first trimester, fetus 1
O41.1412|
Placentitis, first trimester, fetus 2
O41.1413|
Placentitis, first trimester, fetus 3
O41.1414|
Placentitis, first trimester, fetus 4
O41.1415|
Placentitis, first trimester, fetus 5
O41.1419|
Placentitis, first trimester, other fetus
O41.142|
Placentitis, second trimester
O41.1420|
Placentitis, second trimester, not applicable or unspecified
O41.1421|
Placentitis, second trimester, fetus 1
O41.1422|
Placentitis, second trimester, fetus 2
O41.1423|
Placentitis, second trimester, fetus 3
O41.1424|
Placentitis, second trimester, fetus 4
O41.1425|
Placentitis, second trimester, fetus 5
O41.1429|
Placentitis, second trimester, other fetus
O41.143|
Placentitis, third trimester
O41.1430|
Placentitis, third trimester, not applicable or unspecified
O41.1431|
Placentitis, third trimester, fetus 1
O41.1432|
Placentitis, third trimester, fetus 2
O41.1433|
Placentitis, third trimester, fetus 3
O41.1434|
Placentitis, third trimester, fetus 4
O41.1435|
Placentitis, third trimester, fetus 5
O41.1439|
Placentitis, third trimester, other fetus
O41.149|
Placentitis, unspecified trimester
O41.1490|
Placentitis, unspecified trimester, not applicable or unspecified
O41.1491|
Placentitis, unspecified trimester, fetus 1
O41.1492|
Placentitis, unspecified trimester, fetus 2
O41.1493|
Placentitis, unspecified trimester, fetus 3
O41.1494|
Placentitis, unspecified trimester, fetus 4
O41.1495|
Placentitis, unspecified trimester, fetus 5
O41.1499|
Placentitis, unspecified trimester, other fetus
O41.8|
Other specified disorders of amniotic fluid and membranes
O41.8X|
Other specified disorders of amniotic fluid and membranes
O41.8X1|
Other specified disorders of amniotic fluid and membranes, first trimester
O41.8X10|
Other specified disorders of amniotic fluid and membranes, first trimester, not applicable or unspecified
O41.8X11|
Other specified disorders of amniotic fluid and membranes, first trimester, fetus 1
O41.8X12|
Other specified disorders of amniotic fluid and membranes, first trimester, fetus 2
O41.8X13|
Other specified disorders of amniotic fluid and membranes, first trimester, fetus 3
O41.8X14|
Other specified disorders of amniotic fluid and membranes, first trimester, fetus 4
O41.8X15|
Other specified disorders of amniotic fluid and membranes, first trimester, fetus 5

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