2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Infections of genitourinary tract in pregnancy
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O23: its own notes plus those printed at block O20-O29 and Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On O23 itself
  • 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)
From Block O20-O29 Other maternal disorders predominantly related to pregnancy applies to 260 codes
  • maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
  • maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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

Add a second code, after this one, to fully describe the condition.

On O23 itself
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Notes

General instructions on how these codes are used.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name O23, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming O23: they are not reported together with it, unless the two conditions are unrelated.

  • Block N70-N77 Inflammatory diseases of female pelvic organs
    pregnancy, childbirth and the puerperium (O23.-, O75.3, O85, O86.-)

Excludes2 2

These codes carry an Excludes2 note naming O23: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block N30-N39 Other diseases of the urinary system
    pregnancy, childbirth and the puerperium (O23.-, O75.3, O86.2-)
  • O99.8 Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium
    genitourinary infections in pregnancy (O23.-)

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O23Overview

What is the ICD-10 code for infections of genitourinary tract in pregnancy?

O23 is the ICD-10-CM category for infections of genitourinary tract in pregnancy, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Does O23 need an additional code?

When the condition applies, yes. The Use Additional Code note reads: code to identify organism (B95.-, B96.-). The additional code is reported after O23.