Pregnancy, childbirth and the puerperium (O00-O9A) ICD-10-CM
Chapter 15 of the ICD-10-CM classification spans codes O00–O9A and contains 3,023 diagnosis codes for pregnancy, childbirth and the puerperium, of which 2,437 are billable. The chapter is organized into 9 sections listed below, each linking to its code ranges and individual codes.
Chapter Coding 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 Use additional code from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
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)
Sections in This Chapter 9 ranges · 3,023 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About Chapter 15
ICD-10-CM Chapter 15 (O00-O9A) covers all conditions related to pregnancy, childbirth, and the postpartum period. These codes are used to document maternal health from conception through delivery and recovery.
This chapter includes codes for complications during pregnancy such as ectopic pregnancy, gestational diabetes, and preeclampsia. It also addresses labor and delivery details, including normal delivery, cesarean sections, and complications arising during birth. Additionally, the codes cover the postpartum period, known as the puerperium, which involves monitoring and managing health issues following childbirth. Healthcare providers and coders use this set to capture the medical conditions and care specific to pregnancy and childbirth, ensuring accurate tracking of maternal health events and related treatments.
Questions About This Page
How many codes are in the O00-O9A range?
The O00-O9A range contains 3,023 ICD-10-CM diagnosis codes in FY 2026. 2,437 of them are billable, and the rest are category headers that organize the chapter.
What conditions does O00-O9A cover?
The range covers pregnancy, childbirth and the puerperium. The sections listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
