B33.22 Viral myocarditis
The ICD-10-CM code for Viral myocarditis is B33.22 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- B25-B34: Other viral diseases (B25-B34)
- Category B33
- 12 codes (10 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to B33.22:
- Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › aseptic of newborn
- Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › epidemic of newborn (Coxsackie)
- Coxsackie (virus) (infection) › myocarditis
- Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › Coxsackie (virus)
- Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › virus, viral
- Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › virus, viral › of newborn (Coxsackie)
U.S. Hospital Utilization
- An estimated 445 U.S. inpatient stays in 2023 included B33.22 among the documented diagnoses.
- 145 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
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