Q79.1 Other congenital malformations of diaphragm

The ICD-10-CM code for Other congenital malformations of diaphragm is Q79.1 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

Q65-Q79: Congenital malformations and deformations of the musculoskeletal system (Q65-Q79)

Category Q79

17 codes (14 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q79.1:

• Agenesis › diaphragm (with hernia)
• Enlargement, enlarged › apertures of diaphragm (congenital)
• Eventration › diaphragm (congenital)
• Abnormal, abnormality, abnormalities › apertures, congenital, diaphragm
• Deformity › diaphragm (congenital)
• Absence (of) (organ or part) (complete or partial) › diaphragm (with hernia), congenital
• Anomaly, anomalous (congenital) (unspecified type) › diaphragm (apertures) NEC
• Elevated, elevation › diaphragm, congenital

Inclusion Terms

• Absence of diaphragm
• Congenital malformation of diaphragm NOS
• Eventration of diaphragm

U.S. Hospital Utilization

• An estimated 1,530 U.S. inpatient stays in 2023 included Q79.1 among the documented diagnoses.
• 135 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)

Cite This Page

Reference Q79.1 with the canonical source and edition:

Q79.1 — Other congenital malformations of diaphragm. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/Q79.1

Canonical URL: https://icd10codingpro.com/codes/Q79.1