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ICD-10-CM O23.512: Infections of cervix in pregnancy, second trimester

O23.512 is the billable ICD-10-CM code for infections of cervix in pregnancy, second trimester, in category O23 (Infections of genitourinary tract in pregnancy) of the Other maternal disorders predominantly related to pregnancy section. As a principal diagnosis it groups to MS-DRG 817 Other Antepartum Diagnoses with O.R. Procedures with MCC, MS-DRG 818 Other Antepartum Diagnoses with O.R. Procedures with CC, MS-DRG 819 Other Antepartum Diagnoses with O.R. Procedures without CC/MCC (MDC 14 MDC 14: Pregnancy, Childbirth and the Puerperium). As a secondary diagnosis it is a CC, excluded with 263 principal diagnoses.

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
O23.512
billable FY2027 ICD-10-CM code
Category
O23 Infections of genitourinary tract in pregnancy
Chapter
15: Pregnancy, childbirth and the puerperium (O00-O9A)
CC/MCC (MS-DRG v44)
CC
CMS-HCC V28
Not mapped
POA reporting
Required

Tabular list notes for O23.512

The tabular list has no notes on O23.512 itself; the notes below apply from its parent headings.

Inherited from O23 (Infections of genitourinary tract in pregnancy)

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.-)

MS-DRG grouping when O23.512 is the principal diagnosis

MS-DRG v44 groups for O23.512 as principal diagnosis
MDCMS-DRGs
14 MDC 14: Pregnancy, Childbirth and the Puerperium817818819831832833

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for O23.512 shows the full grouping logic.

CC/MCC status and inpatient edits

As a secondary diagnosis, O23.512 is a CC under MS-DRG v44, unless the principal diagnosis is one of the 263 codes in its exclusion list. Check O23.512 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.
  • Medicare Code Editor: age conflict: maternity diagnosis (age 9 to 64).

CMS-HCC V28 risk adjustment

O23.512 does not map to a payment HCC in the PY2027 CMS-HCC V28 model, so on its own it does not change a Medicare Advantage risk score.

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Frequently asked questions

What does ICD-10-CM O23.512 mean?

O23.512 means infections of cervix in pregnancy, second trimester. It is one of 25 billable codes under O23, infections of genitourinary tract in pregnancy.

Which MS-DRG does O23.512 group to?

As the principal diagnosis, O23.512 groups to MS-DRG 817 Other Antepartum Diagnoses with O.R. Procedures with MCC, MS-DRG 818 Other Antepartum Diagnoses with O.R. Procedures with CC, MS-DRG 819 Other Antepartum Diagnoses with O.R. Procedures without CC/MCC (MDC 14 MDC 14: Pregnancy, Childbirth and the Puerperium) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Is O23.512 a CC or MCC?

O23.512 is a CC under MS-DRG v44; 263 principal diagnoses exclude it.

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.

Disclaimer

The descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and the ICD-10-CM Official Guidelines. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.