2026 ICD-10-CM Diagnosis Code O23Infections of genitourinary tract in pregnancy

ICD-10-CM Codes›O00-O9A›O20-O29›O23

ICD-10-CM O23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O23 is a non-billable ICD-10-CM category code for infections of genitourinary tract in pregnancy, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O23.00, O23.01, O23.02, and O23.03.

Code Identity

ICD-10-CM Code
O23
Billable Status
No — Non-Billable Category
Code Describes
Infections of genitourinary tract in pregnancy
Chapter
O20-O29
Other maternal disorders predominantly related to pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO20-O29Other maternal disorders predominantly related to pregnancy
CategoryO23Infections of genitourinary tract in pregnancy
This CodeO23Infections of genitourinary tract in pregnancy

Specific Coding for Infections of genitourinary tract in pregnancyOverview

Non-specific codes like O23 require more characters. Use one of these billable codes instead:

  • O23.0 for Infections of kidney in pregnancy

  • Use O23.00 for Infections of kidney in pregnancy, unspecified trimester

  • Use O23.01 for Infections of kidney in pregnancy, first trimester

  • Use O23.02 for Infections of kidney in pregnancy, second trimester

  • Use O23.03 for Infections of kidney in pregnancy, third trimester

  • O23.1 for Infections of bladder in pregnancy

  • Use O23.10 for Infections of bladder in pregnancy, unspecified trimester

  • Use O23.11 for Infections of bladder in pregnancy, first trimester

  • Use O23.12 for Infections of bladder in pregnancy, second trimester

  • Use O23.13 for Infections of bladder in pregnancy, third trimester

  • O23.2 for Infections of urethra in pregnancy

  • Use O23.20 for Infections of urethra in pregnancy, unspecified trimester

  • Use O23.21 for Infections of urethra in pregnancy, first trimester

  • Use O23.22 for Infections of urethra in pregnancy, second trimester

  • Use O23.23 for Infections of urethra in pregnancy, third trimester

  • O23.3 for Infections of other parts of urinary tract in pregnancy

  • Use O23.30 for Infections of other parts of urinary tract in pregnancy, unspecified trimester

  • Use O23.31 for Infections of other parts of urinary tract in pregnancy, first trimester

  • Use O23.32 for Infections of other parts of urinary tract in pregnancy, second trimester

  • Use O23.33 for Infections of other parts of urinary tract in pregnancy, third trimester

  • O23.4 for Unspecified infection of urinary tract in pregnancy

  • Use O23.40 for Unspecified infection of urinary tract in pregnancy, unspecified trimester

  • Use O23.41 for Unspecified infection of urinary tract in pregnancy, first trimester

  • Use O23.42 for Unspecified infection of urinary tract in pregnancy, second trimester

  • Use O23.43 for Unspecified infection of urinary tract in pregnancy, third trimester

  • O23.5 for Infections of the genital tract in pregnancy

  • O23.51 for Infection of cervix in pregnancy

  • O23.52 for Salpingo-oophoritis in pregnancy

  • O23.59 for Infection of other part of genital tract in pregnancy

  • O23.9 for Unspecified genitourinary tract infection in pregnancy

  • Use O23.90 for Unspecified genitourinary tract infection in pregnancy, unspecified trimester

  • Use O23.91 for Unspecified genitourinary tract infection in pregnancy, first trimester

  • Use O23.92 for Unspecified genitourinary tract infection in pregnancy, second trimester

  • Use O23.93 for Unspecified genitourinary tract infection in pregnancy, third trimester

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Use Additional Code

  • code to identify organism B95 B96

Type 2 Excludes

  • gonococcal infections complicating pregnancy, childbirth and the puerperium O98.2
  • infections with a predominantly sexual mode of transmission NOS complicating pregnancy, childbirth and the puerperium O98.3
  • syphilis complicating pregnancy, childbirth and the puerperium O98.1
  • tuberculosis of genitourinary system complicating pregnancy, childbirth and the puerperium O98.0
  • venereal disease NOS complicating pregnancy, childbirth and the puerperium O98.3

Patient EducationClinical

Infections and Pregnancy

During pregnancy, some common infections such as the common cold or a skin infection do not usually cause serious problems. Some infections, such as the flu, can be more severe when you're pregnant. But other infections can be harmful to you, your fetus, or both.

The full article covers:

  • How can infections affect your pregnancy?
  • What infections can be harmful during pregnancy?
  • What are the symptoms of an infection during pregnancy?
  • What are the treatments for infections during pregnancy?
  • Can infections during pregnancy be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O23Overview

Is O23 (Infections of genitourinary tract in pregnancy) a billable code?

No. This is a category header that groups the codes for infections of genitourinary tract in pregnancy, and headers cannot be submitted on claims. Claims for infections of genitourinary tract in pregnancy need a more specific code from this category, such as O23.00, O23.01, and O23.02.