DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 15

O20-O29 Other maternal disorders predominantly related to pregnancy (O20-O29)

Block O20-O29 groups 9 categories with 260 billable codes in FY2027.

Where it sits

  1. Chapter 15 Pregnancy, childbirth and the puerperium (O00-O9A)
  2. O20-O29 Other maternal disorders predominantly related to pregnancy (O20-O29)

Neighbouring blocks

Categories
9
Billable codes
260
CC codes
85
MCC codes
7
HCC V28 codes
0
New FY2027
0

Categories in O20-O29

  • O20

    Hemorrhage in early pregnancy

    Threatenedabortion → O20.0

    • 3 billable codes
    • 2 CC
  • O21

    Excessive vomiting in pregnancy

    Hyperemesisgravidarum (mild) → O21.0

    • 5 billable codes
  • O22

    Venous complications and hemorrhoids in pregnancy

    Phlebopathy,gestational → O22.9-

    • 32 billable codes
    • 18 CC
    • 3 MCC
  • O23

    Infections of genitourinary tract in pregnancy

    Pregnancy (single) (uterine)complicated by (care of) (management affected by)cystitis → O23.1-

    • 36 billable codes
    • 27 CC
  • O24

    Diabetes mellitus in pregnancy, childbirth, and the puerperium

    Puerperal, puerperium (complicated by, complications)diabetes → O24.93

    • 42 billable codes
    • 25 CC
    • 4 MCC
  • O25

    Malnutrition in pregnancy, childbirth and the puerperium

    Puerperal, puerperium (complicated by, complications)malnutrition → O25.3

    • 6 billable codes
  • O26

    Maternal care for other conditions predominantly related to pregnancy

    Hysteralgia, pregnant uterus → O26.89-

    • 72 billable codes
    • 13 CC
  • O28

    Abnormal findings on antenatal screening of mother

    Findings, abnormal, inconclusive, without diagnosisantenatal screening of mother → O28.9

    • 8 billable codes
  • O29

    Complications of anesthesia during pregnancy

    Mendelson's syndrome (due to anesthesia)in pregnancy → O29.01-

    • 56 billable codes

Index main terms

  • Pregnancy (single) (uterine) → O20, O21, O22, O23, O24, O25, O26, O28, O29 (115 entries)
  • Delivery (childbirth) (labor) → O24, O25, O26 (18 entries)
  • Puerperal, puerperium (complicated by, complications) → O24, O25, O26 (14 entries)
  • Diabetes, diabetic (mellitus) (sugar) → O24 (12 entries)
  • Findings, abnormal, inconclusive, without diagnosis → O28 (9 entries)
  • Hyperemesis → O21 (6 entries)
  • Complication(s) (from) (of) → O29 (5 entries)
  • Thrombophlebitis → O22 (4 entries)
  • Abortion (complete) (spontaneous) → O20, O26 (3 entries)
  • Hemorrhage, hemorrhagic (concealed) → O20 (3 entries)
  • Varix (lower limb) → O22 (3 entries)
  • Failure, failed → O29 (2 entries)
  • Infection, infected, infective (opportunistic) → O23 (2 entries)
  • Pneumonitis (acute) (primary) → O29 (2 entries)
  • Threatened → O20 (2 entries)

+26 more main terms; the search box finds them by word.

Block instructions

Excludes2

  • maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48) O30 O48
  • maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99) O98 O99

Notes that also apply

Chapter 15 instructions (Notes 6, Excludes1 1, Excludes2 4, Use additional code 1): printed on the chapter 15 page.