2026 ICD-10-CM Diagnosis Code Q51.818Other congenital malformations of uterus

ICD-10-CM Codes›Q00-Q99›Q50-Q56›Q51

ICD-10-CM Q51.818
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q51.818 is a billable ICD-10-CM diagnosis code for other congenital malformations of uterus. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 742 through 743, 760 through 761. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Genitourinary congenital anomalies.

Code Identity

ICD-10-CM Code
Q51.818
Billable Status
Yes — Valid for Submission
Code Describes
Other congenital malformations of uterus
Short Description
Other congenital malformations of uterus
Same as the full description in the CMS dataset.
Parent Code
Q51.81
Other congenital malformations of uterus

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ50-Q56Congenital malformations of genital organs
CategoryQ51Congenital malformations of uterus and cervix
This CodeQ51.818Other congenital malformations of uterus

Present on Admission (POA)Billing

Q51.818 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bicornuate uterus
  • Bicornuate uterus in pregnancy, childbirth and the puerperium
  • Cochleate uterus
  • Congenital abnormal shape of fallopian tube
  • Congenital abnormal shape of uterus
  • Congenital abnormality of uterus in pregnancy, childbirth and the puerperium
  • Congenital atresia of uterus
  • Congenital prolapsed uterus
  • Infantile uterus
  • Mullerian aplasia
  • Persistent fetal uterus
  • Pseudounicornuate uterus
  • Solid rudimentary uterus
  • T-shaped uterus
  • Uterus bicameratus vetularum
  • Uterus cordiformis

Tabular List NotesGuidance

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

Inclusion Terms

  • Müllerian anomaly of uterus NEC

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Anomaly, anomalous(congenital) (unspecified type)
      • Müllerian
        • uterus NEC
    • Anteversion
      • uterus, uterine (cervix) (postinfectional) (postpartal, old)
        • congenital
    • Atresia, atretic
      • uterus
    • Cyst(colloid) (mucous) (simple) (retention)
      • uterus (body) (corpus) (recurrent)
        • embryonic
    • Imperfect
      • closure (congenital)
        • uterus
    • Lateroversion
      • uterus, uterine (cervix) (postinfectional) (postpartal, old)
        • congenital
    • Malformation(congenital)
      • uterus
        • specified type NEC
    • Malposition
      • congenital
        • uterus
    • Malposition
      • uterus (acute) (acquired) (adherent) (asymptomatic) (postinfectional) (postpartal, old)
        • anteflexion or anteversion
          • congenital
    • Prolapse, prolapsed
      • uterus (with prolapse of vagina)
        • congenital
    • Retroversion, retroverted
      • uterus (acquired) (acute) (any degree) (asymptomatic) (cervix) (postinfectional) (postpartal, old)
        • congenital
    • Rudimentary(congenital)
      • uterus
    • Squamous
      • epithelium in
        • uterine mucosa (congenital)
    • Triple
      • uteri

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MAL003
Genitourinary congenital anomalies
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Bicornuate Uterus

    a congenital uterine anomaly in which the uterus is divided into two uterine horns with a significant cleft at the uterine fundus due to partial fusion of the mullerian ducts. bicornuate uterus is sometimes associated with a longitudinal vaginal septum and abnormal development of renal tracts.

Patient EducationClinical

Birth Defects

A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.

The full article covers:

  • What are birth defects?
  • What causes birth defects?
  • Who is at risk of having a baby with birth defects?
  • How are birth defects diagnosed?
  • What are the treatments for birth defects?
  • Can birth defects be prevented?

Read the full article at MedlinePlus

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

Convert Q51.818 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
752.39 Anomalies of uterus NEC
Approximate The match is approximate rather than exact.

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 Q51.818Overview

Is Q51.818 (Other congenital malformations of uterus) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other congenital malformations of uterus on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q51.818 group to?

When other congenital malformations of uterus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 743, 760, 761, with relative weights from 0.5696 to 1.8348 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q51.818 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for other congenital malformations of uterus on inpatient claims.

What is the ICD-9 equivalent of Q51.818?

Under the General Equivalence Mappings, other congenital malformations of uterus converts to ICD-9-CM 752.39 (anomalies of uterus NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.