ICD-10-CM 2027
ICD-10 code for aseptic of newborn myocarditis
From the official ICD-10-CM alphabetic index entry “Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › aseptic of newborn”. Page updated September 29, 2026.
About coding aseptic of newborn myocarditis
The ICD-10-CM code for aseptic of newborn myocarditis is B33.22 (Viral myocarditis).
Within B33.2 (viral carditis), B33.22 is specifically for viral myocarditis. Related codes cover unspecified (B33.20), endocarditis (B33.21), pericarditis (B33.23) and cardiomyopathy (B33.24).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 314 (Other Circulatory System Diagnoses with MCC, relative weight 2.0873), DRG 315 (Other Circulatory System Diagnoses with CC, relative weight 0.9508) and DRG 316 (Other Circulatory System Diagnoses without CC/MCC, relative weight 0.6677), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about aseptic of newborn myocarditis ICD-10 codes
What is the ICD-10 code for aseptic of newborn myocarditis?
- B33.22 — Viral myocarditis.
Is B33.22 billable?
- Yes. B33.22 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B33.22 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B33.22 as a principal diagnosis.
Is B33.22 a CC or MCC?
- B33.22 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.