All ICD10 Codes
O23Not billable, use a more specific code below

Infections of genitourinary tract in pregnancy

In Other maternal disorders predominantly related to pregnancy (O20-O29), chapter 15: Pregnancy, Childbirth and the Puerperium

36 billable codes under O23: 27 are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

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Instructional notes

Excludes2: not included here, code separately if applicable

  • 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)

Use additional code: add a second code for this, listed after this one

  • code to identify organism (B95.-, B96.-)

Also applies, from Other maternal disorders predominantly related to pregnancy (O20-O29)

These notes sit on O20-O29 and apply to every code under it, including O23.

Excludes2: not included here, code separately if applicable

  • 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)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Coding of obstetric cases with O00-O9A codes: sequencing priority, trimester and fetus characters, principal diagnosis selection, delivery outcome, and pregnancy-related complications.

Read Section I.C.15 (page 63), 11 more topics

All codes under O23

O23 can't be used on a claim. Pick a billable code below; grey headings group them.

O23 MS-DRGs

As the principal diagnosis, all 36 billable codes under O23 group to MS-DRG 817, 818, 819, 831, 832, or 833 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to O23

Notes on these codes point to O23.

  • N30-N39 Excludes2: pregnancy, childbirth and the puerperium (O23.-, O75.3, O86.2-)
  • N70-N77 Excludes1: pregnancy, childbirth and the puerperium (O23.-, O75.3, O85, O86.-)
  • O99.8 Excludes2: genitourinary infections in pregnancy (O23.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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.

Read more about infections and pregnancy on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.