I41 Myocarditis in diseases classified elsewhere

Billable

Block: Other forms of heart disease (I30-I5A)

Excludes 1 (cannot be coded together)

  • myocarditis (in):
  • Chagas' disease (chronic) (B57.2)
  • acute (B57.0)
  • coxsackie (virus) infection (B33.22)
  • diphtheritic (A36.81)
  • gonococcal (A54.83)
  • influenzal (J09.X9, J10.82, J11.82)
  • meningococcal (A39.52)
  • mumps (B26.82)
  • rheumatoid arthritis (M05.31)
  • sarcoid (D86.85)
  • syphilis (A52.06)
  • toxoplasmosis (B58.81)
  • tuberculous (A18.84)

Code First

  • underlying disease, such as:
  • typhus (A75.0-A75.9)
This category is a complete, billable diagnosis code.

No additional specificity is required — submit I41 directly on claims and documentation without a subcode extension.

Last reviewed: September 2026