Specific code 2012 ICD-9-CM Diagnosis Code 421.0
Acute and subacute bacterial endocarditis
  • Short description: Ac/subac bact endocard.
  • ICD-9-CM 421.0 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 421.0 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2012 version of ICD-9-CM 421.0.
  • More recent version(s) of ICD-9-CM 421.0: 2013 2014.
Disease Synonyms
  • Acute or subacute mycotic aneurysm
  • Bacterial endocarditis
  • Bacterial endocarditis (infection of heart valve)
  • Endocarditis, bacterial
  • Fungal endocarditis
  • Mycotic aneurysm
  • Mycotic aneurysm due to bacterial endocarditis
  • Mycotic aneurysm, due to bacterial endocarditis
  • Mycotic endocarditis
Applies To
  • Endocarditis (acute) (chronic) (subacute):
    • bacterial
    • infective NOS
    • lenta
    • malignant
    • purulent
    • septic
    • ulcerative
    • vegetative
  • Infective aneurysm
  • Subacute bacterial endocarditis [SBE]
Use Additional
  • Use additional code, if desired, to identify infectious organism [e.g., Streptococcus 041.0, Staphylococcus 041.1]
Convert to ICD-10-CM: 421.0 converts approximately to:
  • 2014 ICD-10-CM I33.0 Acute and subacute infective endocarditis
ICD-9-CM Volume 2 Index entries containing back-references to 421.0:
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (ruptured) (saccular) (varicose) 442.9
    • brain 437.3
      • arteriosclerotic 437.3
        • ruptured (see also Hemorrhage, subarachnoid) 430
      • arteriovenous 747.81
        • acquired 437.3
          • ruptured (see also Hemorrhage, subarachnoid) 430
        • ruptured (see also Hemorrhage, subarachnoid) 430
      • berry (congenital) (ruptured) (see also Hemorrhage, subarachnoid) 430
      • congenital 747.81
        • ruptured (see also Hemorrhage, subarachnoid) 430
      • meninges 437.3
        • ruptured (see also Hemorrhage, subarachnoid) 430
      • miliary (congenital) (ruptured) (see also Hemorrhage, subarachnoid) 430
      • mycotic 421.0
        • ruptured (see also Hemorrhage, subarachnoid) 430
      • nonruptured 437.3
      • ruptured (see also Hemorrhage, subarachnoid) 430
      • syphilitic (hemorrhage) 094.87
      • traumatic - see Injury, intracranial
    • endocardial, infective (any valve) 421.0
    • infective (any valve) 421.0
    • mycotic, any site 421.0
      • without endocarditis - see Aneurysm, by site
      • ruptured, brain (see also Hemorrhage, subarachnoid) 430
  • Endocarditis (chronic) (indeterminate) (interstitial) (marantic) (nonbacterial thrombotic) (residual) (sclerotic) (sclerous) (senile) (valvular) 424.90
    • aortic (heart) (nonrheumatic) (valve) 424.1
      • with
        • mitral (valve) disease 396.9
          • active or acute 391.1
            • with chorea (acute) (rheumatic) (Sydenham's) 392.0
            • bacterial 421.0
        • rheumatic fever (conditions classifiable to 390)
          • active - see Endocarditis, acute, rheumatic
          • inactive or quiescent (with chorea) 395.9
            • with mitral disease 396.9
      • acute or subacute 421.9
      • arteriosclerotic 424.1
      • congenital 746.89
      • hypertensive 424.1
      • rheumatic (chronic) (inactive) 395.9
        • with mitral (valve) disease 396.9
          • active or acute 391.1
            • with chorea (acute) (rheumatic) (Sydenham's) 392.0
        • active or acute 391.1
          • with chorea (acute) (rheumatic) (Sydenham's) 392.0
      • specified cause, except rheumatic 424.1
      • syphilitic 093.22
    • bacterial (acute) (any valve) (chronic) (subacute) 421.0
    • constrictive 421.0
    • infectious or infective (acute) (any valve) (chronic) (subacute) 421.0
    • lenta (acute) (any valve) (chronic) (subacute) 421.0
    • Loeffler's (parietal fibroplastic) 421.0
    • malignant (acute) (any valve) (chronic) (subacute) 421.0
    • mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea) 394.9
      • with
        • aortic (valve) disease 396.9
          • active or acute 391.1
            • with chorea (acute) (rheumatic) (Sydenham's) 392.0
        • rheumatic fever (conditions classifiable to 390)
          • active - see Endocarditis, acute, rheumatic
          • inactive or quiescent (with chorea) 394.9
            • with aortic valve disease 396.9
      • active or acute 391.1
        • with chorea (acute) (rheumatic) (Sydenham's) 392.0
        • bacterial 421.0
      • arteriosclerotic 424.0
      • congenital 746.89
      • hypertensive 424.0
      • nonrheumatic 424.0
      • syphilitic 093.21
    • mycotic (acute) (any valve) (chronic) (subacute) 421.0
    • pneumococcic (acute) (any valve) (chronic) (subacute) 421.0
    • purulent (acute) (any valve) (chronic) (subacute) 421.0
    • septic (acute) (any valve) (chronic) (subacute) 421.0
    • streptococcal (acute) (any valve) (chronic) (subacute) 421.0
    • suppurative (any valve) (acute) (chronic) (subacute) 421.0
    • ulcerative (acute) (any valve) (chronic) (subacute) 421.0
    • vegetative (acute) (any valve) (chronic) (subacute) 421.0
  • Infection, infected, infective (opportunistic) 136.9
    • endocardium (see also Endocarditis) 421.0
  • Löffler's
    • endocarditis 421.0
  • Node(s) - see also Nodules
    • Osler's 421.0
  • Osler's
    • nodes 421.0
  • SBE (subacute bacterial endocarditis) 421.0
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerative 707.9
    • endocarditis (any valve) (acute) (chronic) (subacute) 421.0
    • valve, heart 421.0
  • Vegetation, vegetative
    • endocarditis (acute) (any valve) (chronic) (subacute) 421.0
    • heart (mycotic) (valve) 421.0
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 421.0 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 2012 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.