Q50.4 Embryonic cyst of fallopian tube

The ICD-10-CM code for Embryonic cyst of fallopian tube is Q50.4 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

17: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)

Section

Q50-Q56: Congenital malformations of genital organs (Q50-Q56)

Category Q50

13 codes (10 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q50.4:

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

Inclusion Terms

• Fimbrial cyst

U.S. Hospital Utilization

• An estimated 100 U.S. inpatient stays in 2022 included Q50.4 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

POA indicator for congenital conditions/anomalies and Q00-Q99 exception

Congenital conditions and anomalies Assign “Y” for congenital conditions and anomalies except for categories Q00- Q99, Congenital anomalies, which are on the exempt list. Congenital conditions are always considered present on admission.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)