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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O31.31X9|
Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, other fetus
O31.32|
Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester
O31.32X0|
Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, not applicable or unspecified
O31.32X1|
Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 1
O31.32X2|
Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 2
O31.32X3|
Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 3
O31.32X4|
Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 4
O31.32X5|
Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 5
O31.32X9|
Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, other fetus
O31.33|
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester
O31.33X0|
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, not applicable or unspecified
O31.33X1|
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 1
O31.33X2|
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 2
O31.33X3|
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 3
O31.33X4|
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 4
O31.33X5|
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 5
O31.33X9|
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, other fetus
O31.8|
Other complications specific to multiple gestation
O31.8X|
Other complications specific to multiple gestation
O31.8X1|
Other complications specific to multiple gestation, first trimester
O31.8X10|
Other complications specific to multiple gestation, first trimester, not applicable or unspecified
O31.8X11|
Other complications specific to multiple gestation, first trimester, fetus 1
O31.8X12|
Other complications specific to multiple gestation, first trimester, fetus 2
O31.8X13|
Other complications specific to multiple gestation, first trimester, fetus 3
O31.8X14|
Other complications specific to multiple gestation, first trimester, fetus 4
O31.8X15|
Other complications specific to multiple gestation, first trimester, fetus 5
O31.8X19|
Other complications specific to multiple gestation, first trimester, other fetus
O31.8X2|
Other complications specific to multiple gestation, second trimester
O31.8X20|
Other complications specific to multiple gestation, second trimester, not applicable or unspecified
O31.8X21|
Other complications specific to multiple gestation, second trimester, fetus 1
O31.8X22|
Other complications specific to multiple gestation, second trimester, fetus 2
O31.8X23|
Other complications specific to multiple gestation, second trimester, fetus 3
O31.8X24|
Other complications specific to multiple gestation, second trimester, fetus 4
O31.8X25|
Other complications specific to multiple gestation, second trimester, fetus 5
O31.8X29|
Other complications specific to multiple gestation, second trimester, other fetus
O31.8X3|
Other complications specific to multiple gestation, third trimester
O31.8X30|
Other complications specific to multiple gestation, third trimester, not applicable or unspecified
O31.8X31|
Other complications specific to multiple gestation, third trimester, fetus 1
O31.8X32|
Other complications specific to multiple gestation, third trimester, fetus 2
O31.8X33|
Other complications specific to multiple gestation, third trimester, fetus 3
O31.8X34|
Other complications specific to multiple gestation, third trimester, fetus 4
O31.8X35|
Other complications specific to multiple gestation, third trimester, fetus 5
O31.8X39|
Other complications specific to multiple gestation, third trimester, other fetus
O31.8X9|
Other complications specific to multiple gestation, unspecified trimester
O31.8X90|
Other complications specific to multiple gestation, unspecified trimester, not applicable or unspecified
O31.8X91|
Other complications specific to multiple gestation, unspecified trimester, fetus 1
O31.8X92|
Other complications specific to multiple gestation, unspecified trimester, fetus 2
O31.8X93|
Other complications specific to multiple gestation, unspecified trimester, fetus 3
O31.8X94|
Other complications specific to multiple gestation, unspecified trimester, fetus 4
O31.8X95|
Other complications specific to multiple gestation, unspecified trimester, fetus 5

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