2026 ICD-10-CM Diagnosis Code Q50.4Embryonic cyst of fallopian tube

ICD-10-CM Codes›Q00-Q99›Q50-Q56›Q50

ICD-10-CM Q50.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q50.4 is a billable ICD-10-CM diagnosis code for embryonic cyst of fallopian tube. 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
Q50.4
Billable Status
Yes — Valid for Submission
Code Describes
Embryonic cyst of fallopian tube
Short Description
Embryonic cyst of fallopian tube
Same as the full description in the CMS dataset.
Parent Code
Q50
Congenital malformations of ovaries, fallopian tubes and broad ligaments

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ50-Q56Congenital malformations of genital organs
CategoryQ50Congenital malformations of ovaries, fallopian tubes and broad ligaments
This CodeQ50.4Embryonic cyst of fallopian tube

Present on Admission (POA)Billing

Q50.4 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.

  • Congenital anomaly of broad ligament
  • Congenital anomaly of left fallopian tube
  • Congenital anomaly of right fallopian tube
  • Congenital hydrosalpinx
  • Cyst of broad ligament
  • Cyst of fallopian tube
  • Cyst of left fallopian tube
  • Cyst of paramesonephric duct
  • Cyst of right fallopian tube
  • Embryonic cyst of broad ligament
  • Embryonic cyst of fallopian tube
  • Embryonic cyst of fallopian tube and broad ligament
  • Embryonic cyst of left fallopian tube
  • Embryonic cyst of right fallopian tube
  • Embryonic fimbrial cyst
  • Hydrosalpinx
  • Mullerian remnant
  • Paratubal cyst arising in mesonephric duct

Tabular List NotesGuidance

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

Inclusion Terms

  • Fimbrial cyst

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.

    • Cyst(colloid) (mucous) (simple) (retention)
      • congenital NEC
        • fallopian tube
    • Cyst(colloid) (mucous) (simple) (retention)
      • congenital NEC
        • oviduct
    • Cyst(colloid) (mucous) (simple) (retention)
      • embryonic
        • fallopian tube
    • Cyst(colloid) (mucous) (simple) (retention)
      • fallopian tube
        • congenital
    • Cyst(colloid) (mucous) (simple) (retention)
      • fimbrial (twisted)
    • Cyst(colloid) (mucous) (simple) (retention)
      • Müllerian duct
    • Cyst(colloid) (mucous) (simple) (retention)
      • Müllerian duct
        • fallopian tube
    • Cyst(colloid) (mucous) (simple) (retention)
      • Müllerian duct
        • female
    • Cyst(colloid) (mucous) (simple) (retention)
      • paramesonephric duct
    • Cyst(colloid) (mucous) (simple) (retention)
      • paramesonephric duct
        • female
    • Fimbrial cyst

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

  • Hydrosalpinx

    fluid accumulation and dilatation of the fallopian tube due to tubal blockage.

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 Q50.4 to ICD-9-CMHistory

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

ICD-9-CM
752.11 Embryonic cyst of adnexa
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 Q50.4Overview

Is Q50.4 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report embryonic cyst of fallopian tube on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q50.4 group to?

When embryonic cyst of fallopian tube 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 Q50.4 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 embryonic cyst of fallopian tube on inpatient claims.

What is the ICD-9 equivalent of Q50.4?

Under the General Equivalence Mappings, embryonic cyst of fallopian tube converts to ICD-9-CM 752.11 (embryonic cyst of adnexa). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.