A18.03 Tuberculosis of other bones

The ICD-10-CM code for Tuberculosis of other bones is A18.03 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

1: Certain infectious and parasitic diseases (A00-B99)

Section

A15-A19: Tuberculosis (A15-A19)

Category A18

38 codes (32 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to A18.03:

• Dactylitis › tuberculous
• Caries › orbit (tuberculous)
• Caries › tuberculous
• Mastoiditis (coalescent) (hemorrhagic) (suppurative) › tuberculous
• Caries › nose (tuberculous)
• Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) › bone
• Caries › bone NEC
• Caries › limb NEC (tuberculous)

Inclusion Terms

• Tuberculous mastoiditis
• Tuberculous osteomyelitis

U.S. Hospital Utilization

• An estimated 55 U.S. inpatient stays in 2021 included A18.03 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

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

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)