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ICD-10-CM category O23: Infections of genitourinary tract in pregnancy

Category O23 is a heading in chapter 15 (Pregnancy, childbirth and the puerperium (O00-O9A)), section Other maternal disorders predominantly related to pregnancy (O20-O29). It is not billable; report one of the 36 complete codes below.

Notes that apply to every O23 code

Excludes2 (not part of this condition, may be coded together)
  • 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
  • code to identify organism (B95.-, B96.-)

Billable codes in O23

Billable FY2027 ICD-10-CM codes in category O23
CodeDescription
O23.00Infections of kidney in pregnancy, unspecified trimester
O23.01Infections of kidney in pregnancy, first trimester
O23.02Infections of kidney in pregnancy, second trimester
O23.03Infections of kidney in pregnancy, third trimester
O23.10Infections of bladder in pregnancy, unspecified trimester
O23.11Infections of bladder in pregnancy, first trimester
O23.12Infections of bladder in pregnancy, second trimester
O23.13Infections of bladder in pregnancy, third trimester
O23.20Infections of urethra in pregnancy, unspecified trimester
O23.21Infections of urethra in pregnancy, first trimester
O23.22Infections of urethra in pregnancy, second trimester
O23.23Infections of urethra in pregnancy, third trimester
O23.30Infections of other parts of urinary tract in pregnancy, unspecified trimester
O23.31Infections of other parts of urinary tract in pregnancy, first trimester
O23.32Infections of other parts of urinary tract in pregnancy, second trimester
O23.33Infections of other parts of urinary tract in pregnancy, third trimester
O23.40Unspecified infection of urinary tract in pregnancy, unspecified trimester
O23.41Unspecified infection of urinary tract in pregnancy, first trimester
O23.42Unspecified infection of urinary tract in pregnancy, second trimester
O23.43Unspecified infection of urinary tract in pregnancy, third trimester
O23.511Infections of cervix in pregnancy, first trimester
O23.512Infections of cervix in pregnancy, second trimester
O23.513Infections of cervix in pregnancy, third trimester
O23.519Infections of cervix in pregnancy, unspecified trimester
O23.521Salpingo-oophoritis in pregnancy, first trimester
O23.522Salpingo-oophoritis in pregnancy, second trimester
O23.523Salpingo-oophoritis in pregnancy, third trimester
O23.529Salpingo-oophoritis in pregnancy, unspecified trimester
O23.591Infection of other part of genital tract in pregnancy, first trimester
O23.592Infection of other part of genital tract in pregnancy, second trimester
O23.593Infection of other part of genital tract in pregnancy, third trimester
O23.599Infection of other part of genital tract in pregnancy, unspecified trimester
O23.90Unspecified genitourinary tract infection in pregnancy, unspecified trimester
O23.91Unspecified genitourinary tract infection in pregnancy, first trimester
O23.92Unspecified genitourinary tract infection in pregnancy, second trimester
O23.93Unspecified genitourinary tract infection in pregnancy, third trimester

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Codes from the FY2027 ICD-10-CM files (all chapters). Report the code that matches the documentation and the Official Guidelines; this list is not coding advice.