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ICD-10-CM chapter 15 · O00-O9A

Pregnancy, childbirth and the puerperium

About chapter 15

Chapter 15 (O00-O9A) contains 72 categories and 2,481 billable codes for FY2027. This year's update added 56 and deleted 0 codes here. 215 codes are MCCs and 457 are CCs when reported as secondary diagnoses.

9 code blocks

Chapter notes

Note
  • 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.-)
Excludes2
  • 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.