Q79.8 Other congenital malformations of musculoskeletal system

The ICD-10-CM code for Other congenital malformations of musculoskeletal system is Q79.8 (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 Q79

17 codes (14 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q79.8:

• Thoracogastroschisis (congenital)
• Myelo-osteo-musculodysplasia hereditaria
• Amyoplasia congenita
• Touraine's syndrome
• Acromicria, acromikria
• Poland syndrome
• Absence (of) (organ or part) (complete or partial) › muscle (congenital) (pectoral)
• Absence (of) (organ or part) (complete or partial) › tendon (congenital)

Inclusion Terms

• Absence of muscle
• Absence of tendon
• Accessory muscle
• Amyotrophia congenita
• Congenital constricting bands
• Congenital shortening of tendon
• Poland syndrome

U.S. Hospital Utilization

• An estimated 1,040 U.S. inpatient stays in 2023 included Q79.8 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)