Q43.8 Other specified congenital malformations of intestine

The ICD-10-CM code for Other specified congenital malformations of intestine is Q43.8 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

Q38-Q45: Other congenital malformations of the digestive system (Q38-Q45)

Category Q43

11 codes (10 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q43.8:

• Megaloduodenum
• Microcolon (congenital)
• MVID (microvillus inclusion disease)
• Microvillus inclusion disease (MVD) (MVID)
• Dolichocolon
• MVD (microvillus inclusion disease)
• Megaloappendix
• Anomaly, anomalous (congenital) (unspecified type) › appendix

Inclusion Terms

• Congenital blind loop syndrome
• Congenital diverticulitis, colon
• Congenital diverticulum, intestine
• Dolichocolon
• Megaloappendix
• Megaloduodenum
• Microcolon
• Transposition of appendix
• Transposition of colon
• Transposition of intestine

U.S. Hospital Utilization

• An estimated 23,510 U.S. inpatient stays in 2023 included Q43.8 among the documented diagnoses.
• 510 stays listed it as the principal diagnosis.

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)