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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  • O35.02|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly

  • O35.02X0|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, not applicable or unspecified

  • O35.02X1|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 1

  • O35.02X2|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 2

  • O35.02X3|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 3

  • O35.02X4|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 4

  • O35.02X5|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 5

  • O35.02X9|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, other fetus

  • O35.03|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts

  • O35.03X0|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, not applicable or unspecified

  • O35.03X1|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 1

  • O35.03X2|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 2

  • O35.03X3|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 3

  • O35.03X4|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 4

  • O35.03X5|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 5

  • O35.03X9|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, other fetus

  • O35.04|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele

  • O35.04X0|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, not applicable or unspecified

  • O35.04X1|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 1

  • O35.04X2|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 2

  • O35.04X3|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 3

  • O35.04X4|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 4

  • O35.04X5|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 5

  • O35.04X9|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, other fetus

  • O35.05|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly

  • O35.05X0|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly, not applicable or unspecified

  • O35.05X1|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly, fetus 1

  • O35.05X2|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly, fetus 2

  • O35.05X3|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly, fetus 3

  • O35.05X4|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly, fetus 4

  • O35.05X5|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly, fetus 5

  • O35.05X9|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly, other fetus

  • O35.06|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly

  • O35.06X0|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly, not applicable or unspecified

  • O35.06X1|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly, fetus 1

  • O35.06X2|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly, fetus 2

  • O35.06X3|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly, fetus 3

  • O35.06X4|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly, fetus 4

  • O35.06X5|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly, fetus 5

  • O35.06X9|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly, other fetus

  • O35.07|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly

  • O35.07X0|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly, not applicable or unspecified

  • O35.07X1|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly, fetus 1

  • O35.07X2|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly, fetus 2

  • O35.07X3|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly, fetus 3

  • O35.07X4|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly, fetus 4

  • O35.07X5|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly, fetus 5

  • O35.07X9|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly, other fetus

  • O35.08|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida

  • O35.08X0|

    Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida, not applicable or unspecified

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