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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O26.822|
Pregnancy related peripheral neuritis, second trimester
O26.823|
Pregnancy related peripheral neuritis, third trimester
O26.829|
Pregnancy related peripheral neuritis, unspecified trimester
O26.83|
Pregnancy related renal disease
O26.831|
Pregnancy related renal disease, first trimester
O26.832|
Pregnancy related renal disease, second trimester
O26.833|
Pregnancy related renal disease, third trimester
O26.839|
Pregnancy related renal disease, unspecified trimester
O26.84|
Uterine size-date discrepancy complicating pregnancy
O26.841|
Uterine size-date discrepancy, first trimester
O26.842|
Uterine size-date discrepancy, second trimester
O26.843|
Uterine size-date discrepancy, third trimester
O26.849|
Uterine size-date discrepancy, unspecified trimester
O26.85|
Spotting complicating pregnancy
O26.851|
Spotting complicating pregnancy, first trimester
O26.852|
Spotting complicating pregnancy, second trimester
O26.853|
Spotting complicating pregnancy, third trimester
O26.859|
Spotting complicating pregnancy, unspecified trimester
O26.86|
Pruritic urticarial papules and plaques of pregnancy (PUPPP)
O26.87|
Cervical shortening
O26.872|
Cervical shortening, second trimester
O26.873|
Cervical shortening, third trimester
O26.879|
Cervical shortening, unspecified trimester
O26.89|
Other specified pregnancy related conditions
O26.891|
Other specified pregnancy related conditions, first trimester
O26.892|
Other specified pregnancy related conditions, second trimester
O26.893|
Other specified pregnancy related conditions, third trimester
O26.899|
Other specified pregnancy related conditions, unspecified trimester
O26.9|
Pregnancy related conditions, unspecified
O26.90|
Pregnancy related conditions, unspecified, unspecified trimester
O26.91|
Pregnancy related conditions, unspecified, first trimester
O26.92|
Pregnancy related conditions, unspecified, second trimester
O26.93|
Pregnancy related conditions, unspecified, third trimester
O28|
Abnormal findings on antenatal screening of mother
O28.0|
Abnormal hematological finding on antenatal screening of mother
O28.1|
Abnormal biochemical finding on antenatal screening of mother
O28.2|
Abnormal cytological finding on antenatal screening of mother
O28.3|
Abnormal ultrasonic finding on antenatal screening of mother
O28.4|
Abnormal radiological finding on antenatal screening of mother
O28.5|
Abnormal chromosomal and genetic finding on antenatal screening of mother
O28.8|
Other abnormal findings on antenatal screening of mother
O28.9|
Unspecified abnormal findings on antenatal screening of mother
O29|
Complications of anesthesia during pregnancy
O29.0|
Pulmonary complications of anesthesia during pregnancy
O29.01|
Aspiration pneumonitis due to anesthesia during pregnancy
O29.011|
Aspiration pneumonitis due to anesthesia during pregnancy, first trimester
O29.012|
Aspiration pneumonitis due to anesthesia during pregnancy, second trimester
O29.013|
Aspiration pneumonitis due to anesthesia during pregnancy, third trimester
O29.019|
Aspiration pneumonitis due to anesthesia during pregnancy, unspecified trimester
O29.02|
Pressure collapse of lung due to anesthesia during pregnancy

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