Specific code 2014 ICD-9-CM Diagnosis Code 421.0
Acute and subacute bacterial endocarditis
  • Billable Code
  • 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.
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
Clinical Information
  • Infection occuring when bacteria in the bloodstream (bacteremia) adhere to abnormal heart valves or other damaged heart tissue; characterized by growths, known as vegetations, on the valves or other areas of the heart which can break off, travel to other parts of the body, and cause serious complications; a common causative bacteria is staphylococcus, but any organism entering the bloodstream from any site of prior infection can result in the infection.
  • Subacute inflammation of the endocardium. Streptococcus viridans is the usual etiologic agent of sbe. The distinction between "acute" and "subacute" endocarditis has traditionally been made based on the pathogenic organism and clinical presentation.
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 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.