Q73.8 Other reduction defects of unspecified limb(s)

The ICD-10-CM code for Other reduction defects of unspecified limb(s) is Q73.8 (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 Q73

4 codes (3 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q73.8:

• Ectromelia
• Hemimelia
• Hemiectromelia
• Hypoplasia, hypoplastic › limb
• Deformity › reduction (extremity) (limb), congenital
• Aplasia › limb (congenital)
• Defect, defective › reduction › limb
• Defect, defective › reduction › limb › specified type NEC

Inclusion Terms

• Longitudinal reduction deformity of unspecified limb(s)
• Ectromelia of limb NOS
• Hemimelia of limb NOS
• Reduction defect of limb NOS

U.S. Hospital Utilization

• An estimated 60 U.S. inpatient stays in 2022 included Q73.8 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)