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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O35.08X1|
Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida, fetus 1
O35.08X2|
Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida, fetus 2
O35.08X3|
Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida, fetus 3
O35.08X4|
Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida, fetus 4
O35.08X5|
Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida, fetus 5
O35.08X9|
Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida, other fetus
O35.09|
Maternal care for (suspected) other central nervous system malformation or damage in fetus
O35.09X0|
Maternal care for (suspected) other central nervous system malformation or damage in fetus, not applicable or unspecified
O35.09X1|
Maternal care for (suspected) other central nervous system malformation or damage in fetus, fetus 1
O35.09X2|
Maternal care for (suspected) other central nervous system malformation or damage in fetus, fetus 2
O35.09X3|
Maternal care for (suspected) other central nervous system malformation or damage in fetus, fetus 3
O35.09X4|
Maternal care for (suspected) other central nervous system malformation or damage in fetus, fetus 4
O35.09X5|
Maternal care for (suspected) other central nervous system malformation or damage in fetus, fetus 5
O35.09X9|
Maternal care for (suspected) other central nervous system malformation or damage in fetus, other fetus
O35.1|
Maternal care for (suspected) chromosomal abnormality in fetus
O35.10|
Maternal care for (suspected) chromosomal abnormality in fetus, unspecified
O35.10X0|
Maternal care for (suspected) chromosomal abnormality in fetus, unspecified, not applicable or unspecified
O35.10X1|
Maternal care for (suspected) chromosomal abnormality in fetus, unspecified, fetus 1
O35.10X2|
Maternal care for (suspected) chromosomal abnormality in fetus, unspecified, fetus 2
O35.10X3|
Maternal care for (suspected) chromosomal abnormality in fetus, unspecified, fetus 3
O35.10X4|
Maternal care for (suspected) chromosomal abnormality in fetus, unspecified, fetus 4
O35.10X5|
Maternal care for (suspected) chromosomal abnormality in fetus, unspecified, fetus 5
O35.10X9|
Maternal care for (suspected) chromosomal abnormality in fetus, unspecified, other fetus
O35.11|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13
O35.11X0|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, not applicable or unspecified
O35.11X1|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 1
O35.11X2|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 2
O35.11X3|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 3
O35.11X4|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 4
O35.11X5|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, fetus 5
O35.11X9|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13, other fetus
O35.12|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18
O35.12X0|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, not applicable or unspecified
O35.12X1|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 1
O35.12X2|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 2
O35.12X3|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 3
O35.12X4|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 4
O35.12X5|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, fetus 5
O35.12X9|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18, other fetus
O35.13|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21
O35.13X0|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, not applicable or unspecified
O35.13X1|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, fetus 1
O35.13X2|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, fetus 2
O35.13X3|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, fetus 3
O35.13X4|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, fetus 4
O35.13X5|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, fetus 5
O35.13X9|
Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, other fetus
O35.14|
Maternal care for (suspected) chromosomal abnormality in fetus, Turner Syndrome
O35.14X0|
Maternal care for (suspected) chromosomal abnormality in fetus, Turner Syndrome, not applicable or unspecified
O35.14X1|
Maternal care for (suspected) chromosomal abnormality in fetus, Turner Syndrome, fetus 1

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