422.90 ACUTE MYOCARDITIS NOS


Code Information

Diagnosis Code: 422.90

Short Description: Acute myocarditis NOS

Long Description: Acute myocarditis, unspecified

Code Classification:

  • Diseases of the circulatory system (390–459)
    • Other forms of heart disease (420-429)
      • 422 Acute myocarditis
        • 422.90 Acute myocarditis NOS

Code Version: 2015 ICD-9-CM


References to Index of Diseases and Injuries

The code 422.90 has the following ICD-9-CM references to the Index of Diseases and Injuries
  • Infection, infected, infective (opportunistic) 136.9
    • myocardium NEC 422.90
  • Myocarditis (fibroid) (interstitial) (old) (progressive) (senile) (with arteriosclerosis) 429.0
    • active (nonrheumatic) 422.90
      • rheumatic 391.2
        • with chorea (acute) (rheumatic) (Sydenham's) 392.0
    • acute or subacute (interstitial) 422.90
      • due to Streptococcus (beta-hemolytic) 391.2
      • idiopathic 422.91
      • rheumatic 391.2
        • with chorea (acute) (rheumatic) (Sydenham's) 392.0
      • specified type NEC 422.99
    • nonrheumatic, active 422.90
    • parenchymatous 422.90
  • Rupture, ruptured 553.9
    • heart (auricle) (ventricle) (see also Infarct, myocardium) 410.9
      • infectional 422.90

Crosswalk Information

The code 422.90 converts into the following ICD-10 code(s):
ICD-9 Code ICD-10 Code ICD-10 Description
422.90 Right Arrow I40.9 Acute myocarditis, unspecified
This ICD-9 to ICD-10 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-9 Code ICD-9 Description
422.0 Acute myocarditis in diseases classified elsewhere
422.91 Idiopathic myocarditis
422.92 Septic myocarditis
422.93 Toxic myocarditis
422.99 Other acute myocarditis


This page was last updated on: 10/1/2014