DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

O00-O9A · FY2027

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

Chapter 15 holds 72 categories in 9 blocks, with 2,481 billable codes in FY2027, 44 of them new this year.

Blocks
9
Categories
72
Billable codes
2,481
New FY2027
44
Instructions
12

Blocks and categories

Chapter instructions

Notes

  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

Excludes1

  • supervision of normal pregnancy (Z34.-) Z34

Excludes2

  • mental and behavioral disorders associated with the puerperium (F53.-) F53
  • obstetrical tetanus (A34) A34
  • postpartum necrosis of pituitary gland (E23.0) E23.0
  • puerperal osteomalacia (M83.0) M83.0

Use additional code

  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known. Z3A