Q40.9 Congenital malformation of upper alimentary tract, unspecified

The ICD-10-CM code for Congenital malformation of upper alimentary tract, unspecified is Q40.9 (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 Q40

7 codes (6 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q40.9:

• Malformation (congenital) › alimentary tract › upper
• Deformity › alimentary tract, congenital › upper
• Anomaly, anomalous (congenital) (unspecified type) › alimentary tract › upper
• Anomaly, anomalous (congenital) (unspecified type) › digestive organ (s) or tract › upper

Inclusion Terms

• Congenital anomaly of upper alimentary tract
• Congenital deformity of upper alimentary tract

U.S. Hospital Utilization

Q40.9 appeared in too few sampled U.S. inpatient stays in 2020 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient 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)

Cite This Page

Reference Q40.9 with the canonical source and edition:

Q40.9 — Congenital malformation of upper alimentary tract, unspecified. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/Q40.9

Canonical URL: https://icd10codingpro.com/codes/Q40.9