All ICD10 Codes
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 CodesBillable Only
Internal Codes
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  • O31.30—

    Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester

  • O31.30X0—

    Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, not applicable or unspecified

  • O31.30X1—

    Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 1

  • O31.30X2—

    Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 2

  • O31.30X3—

    Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 3

  • O31.30X4—

    Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 4

  • O31.30X5—

    Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 5

  • O31.30X9—

    Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, other fetus

  • O31.31—

    Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester

  • O31.31X0—

    Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, not applicable or unspecified

  • O31.31X1—

    Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 1

  • O31.31X2—

    Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 2

  • O31.31X3—

    Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 3

  • O31.31X4—

    Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 4

  • O31.31X5—

    Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 5

  • 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

  • O31.8X1—

    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

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