Q74.1 Congenital malformation of knee

The ICD-10-CM code for Congenital malformation of knee is Q74.1 (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 Q74

7 codes (6 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q74.1:

• Bifid (congenital) › patella
• Anomaly, anomalous (congenital) (unspecified type) › patella
• Absence (of) (organ or part) (complete or partial) › patella, congenital
• Agenesis › patella
• Elongated, elongation (congenital) › ligamentum patellae
• Genu › congenital
• Anomaly, anomalous (congenital) (unspecified type) › knee
• Biparta, bipartite › patella

Inclusion Terms

• Congenital absence of patella
• Congenital dislocation of patella
• Congenital genu valgum
• Congenital genu varum
• Rudimentary patella

U.S. Hospital Utilization

• An estimated 515 U.S. inpatient stays in 2023 included Q74.1 among the documented diagnoses.
• 90 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)