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Chapter 15: Pregnancy, childbirth and the puerperium (O00–O9A)

Pregnancy, childbirth and the weeks after delivery: antenatal conditions such as pre-eclampsia and gestational diabetes, labour and delivery, caesarean birth, and postpartum complications.

Chapter 15 spans codes O00–O9A in the FY2027 ICD-10-CM tabular list. This guide explains 18 of its most common codes — select a code for its official description, a plain-English explanation and a note on when the code is used.

ICD-10 Chapter 15: Pregnancy, Childbirth & Puerperium — illustrative image

Codes in this chapter

CodeOfficial descriptionIn plain words
O03.9Complete or unspecified spontaneous abortion without complicationA spontaneous abortion (miscarriage) that is complete or unspecified, without complications being recorded.
O09.90Supervision of high risk pregnancy, unspecified, unspecified trimesterSupervision of a high-risk pregnancy, recorded without the trimester or the specific risk being stated.
O10.919Unspecified pre-existing hypertension complicating pregnancy, unspecified trimesterPre-existing hypertension (high blood pressure present before pregnancy) complicating pregnancy; trimester not specified.
O13.9Gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimesterGestational hypertension is new high blood pressure arising in pregnancy without significant protein in the urine; trimester unspecified.
O14.90Unspecified pre-eclampsia, unspecified trimesterPre-eclampsia is a pregnancy condition of high blood pressure with protein in the urine or organ effects; severity and trimester unspecified.
O20.0Threatened abortionThreatened abortion is vaginal bleeding in early pregnancy with a closed cervix, where the pregnancy may continue.
O21.0Mild hyperemesis gravidarumMild hyperemesis gravidarum is excessive vomiting in pregnancy beyond ordinary morning sickness, without metabolic disturbance.
O21.9Vomiting of pregnancy, unspecifiedVomiting in pregnancy ('morning sickness' and related vomiting) recorded without severity or timing specified.
O23.40Unspecified infection of urinary tract in pregnancy, unspecified trimesterA urinary tract infection occurring in pregnancy; the trimester is not specified.
O24.419Gestational diabetes mellitus in pregnancy, unspecified controlGestational diabetes is diabetes first recognised in pregnancy, usually screened for at 24–28 weeks; control method unspecified.
O26.899Other specified pregnancy related conditions, unspecified trimesterAnother specified pregnancy-related condition affecting the mother, not covered by the more specific pregnancy codes.
O34.219Maternal care for unspecified type scar from previous cesarean deliveryCare in pregnancy for a woman who has a scar on the uterus from a previous caesarean delivery.
O42.90Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified weeks of gestationPreterm premature rupture of membranes: the waters break before 37 weeks, with the onset of labour not specified.
O47.9False labor, unspecifiedFalse labour (Braxton Hicks contractions) means contractions that do not progress to true labour; gestation not specified.
O60.00Preterm labor without delivery, unspecified trimesterThreatened preterm labour means signs suggesting labour may start before 37 weeks, recorded without delivery following at that stage.
O72.1Other immediate postpartum hemorrhageOther immediate postpartum haemorrhage is heavy bleeding shortly after delivery from causes covered by this code.
O80Encounter for full-term uncomplicated deliveryAn encounter for a full-term delivery that proceeds without complications, with a single live-born baby.
O82Encounter for cesarean delivery without indicationAn encounter for a caesarean delivery performed without a specific medical indication being recorded.

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.

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