Specific code 2007 ICD-9-CM Diagnosis Code 420.90
Acute pericarditis unspecified
  • Short description: ACUTE PERICARDITIS NOS.
  • ICD-9-CM 420.90 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 420.90 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
  • You are viewing the 2007 version of ICD-9-CM 420.90.
  • More recent version(s) of ICD-9-CM 420.90: 2008 2009 2010 2011 2012 2013 2014 2015.
Convert to ICD-10-CM: 420.90 converts approximately to:
  • 2015/16 ICD-10-CM I30.9 Acute pericarditis, unspecified
Approximate Synonyms
  • Acute pericarditis
  • Acute pericarditis (inflammation of heart sac)
  • Pericarditis
  • Pericarditis (inflamed covering of heart)
  • Pericarditis, acute
Applies To
  • Pericarditis (acute):
    • NOS
    • infective NOS
    • sicca
ICD-9-CM Volume 2 Index entries containing back-references to 420.90:
  • Chylopericardium (acute) 420.90
  • Effusion
    • pericardium, pericardial (see also Pericarditis) 423.9
      • acute 420.90
  • Mediastinopericarditis (see also Pericarditis) 423.9
    • acute 420.90
  • Pericarditis (granular) (with decompensation) (with effusion) 423.9
    • acute (nonrheumatic) 420.90
      • with chorea (acute) (rheumatic) (Sydenham's) 392.0
      • bacterial 420.99
      • benign 420.91
      • hemorrhagic 420.90
      • idiopathic 420.91
      • infective 420.90
      • nonspecific 420.91
      • rheumatic 391.0
        • with chorea (acute) (rheumatic) (Sydenham's) 392.0
      • sicca 420.90
      • viral 420.91
    • cholesterol (chronic) 423.8
      • acute 420.90
    • infective (acute) 420.90
    • neoplastic (chronic) 423.8
      • acute 420.90
  • Pleuropericarditis (see also Pericarditis) 423.9
    • acute 420.90
  • Pneumopericarditis (see also Pericarditis) 423.9
    • acute 420.90
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 420.90 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2007 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.