2020 ICD-10-CM Diagnosis Code I33.0

Acute and subacute infective endocarditis

    2016 2017 2018 2019 2020 Billable/Specific Code
  • I33.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM I33.0 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of I33.0 - other international versions of ICD-10 I33.0 may differ.
Applicable To
  • Bacterial endocarditis (acute) (subacute)
  • Infective endocarditis (acute) (subacute) NOS
  • Endocarditis lenta (acute) (subacute)
  • Malignant endocarditis (acute) (subacute)
  • Purulent endocarditis (acute) (subacute)
  • Septic endocarditis (acute) (subacute)
  • Ulcerative endocarditis (acute) (subacute)
  • Vegetative endocarditis (acute) (subacute)
Use Additional
Use Additional Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • code (B95-B97
    ICD-10-CM Range B95-B97

    Bacterial and viral infectious agents

    Note
    • These categories are provided for use as supplementary or additional codes to identify the infectious agent(s) in diseases classified elsewhere.
    • B95 Streptococcus, Staphylococcus, and Enter...
    • B96 Other bacterial agents as the cause of d...
    • B97 Viral agents as the cause of diseases cl...
    ) to identify infectious agent
The following code(s) above I33.0 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to I33.0:
  • I00-I99
    2020 ICD-10-CM Range I00-I99

    Diseases of the circulatory system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    • systemic connective tissue disorders (M30-M36)
    • transient cerebral ischemic attacks and related syndromes (G45.-)
    Diseases of the circulatory system
  • I33
    ICD-10-CM Diagnosis Code I33

    Acute and subacute endocarditis

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • acute rheumatic endocarditis (I01.1)
    • endocarditis NOS (I38)
    Acute and subacute endocarditis
Approximate Synonyms
  • Acute or subacute mycotic aneurysm
  • Bacterial endocarditis
  • Bacterial endocarditis (infection of heart valve)
  • Fungal endocarditis
  • Histoplasma capsulatum with endocarditis
  • Histoplasmosis endocarditis
  • Infection and inflammatory reaction due to cardiac valve prosthesis
  • Infection of prosthetic valve
  • Mycotic aneurysm due to bacterial endocarditis
  • Mycotic endocarditis
ICD-10-CM I33.0 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 288 Acute and subacute endocarditis with mcc
  • 289 Acute and subacute endocarditis with cc
  • 290 Acute and subacute endocarditis without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems
  • 974 Hiv with major related condition with mcc
  • 975 Hiv with major related condition with cc
  • 976 Hiv with major related condition without cc/mcc

Convert I33.0 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to I33.0:
  • Code First: I76
    , M02
    ICD-10-CM Diagnosis Code I76

    Septic arterial embolism

      2016 2017 2018 2019 2020 Billable/Specific Code
    Code First
    • underlying infection, such as:
    • infective endocarditis (I33.0)
    • lung abscess (J85.-)
    Type 2 Excludes
    Use Additional
    • code to identify the site of the embolism (I74.-)
    ICD-10-CM Diagnosis Code M02

    Postinfective and reactive arthropathies

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code First
    • underlying disease, such as:
    • congenital syphilis [Clutton's joints] (A50.5)
    • enteritis due to Yersinia enterocolitica (A04.6)
    • infective endocarditis (I33.0)
    • viral hepatitis (B15-B19)
    Type 1 Excludes
    • Behçet's disease (M35.2)
    • direct infections of joint in infectious and parasitic diseases classified elsewhere (M01.-)
    • postmeningococcal arthritis (A39.84)
    • mumps arthritis (B26.85)
    • rubella arthritis (B06.82)
    • syphilis arthritis (late) (A52.77)
    • rheumatic fever (I00)
    • tabetic arthropathy [Charcôt's] (A52.16)

Diagnosis Index entries containing back-references to I33.0:
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) I72.9
    ICD-10-CM Diagnosis Code I72.9

    Aneurysm of unspecified site

      2016 2017 2018 2019 2020 Billable/Specific Code
    • brain I67.1
      ICD-10-CM Diagnosis Code I67.1

      Cerebral aneurysm, nonruptured

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Cerebral aneurysm NOS
      • Cerebral arteriovenous fistula, acquired
      • Internal carotid artery aneurysm, intracranial portion
      • Internal carotid artery aneurysm, NOS
      Type 1 Excludes
      • congenital cerebral aneurysm, nonruptured (Q28.-)
      • ruptured cerebral aneurysm (I60.7)
      • mycotic I33.0
    • infective I72.9
      ICD-10-CM Diagnosis Code I72.9

      Aneurysm of unspecified site

        2016 2017 2018 2019 2020 Billable/Specific Code
      • endocardial I33.0 (any valve)
    • mycotic I72.9
      ICD-10-CM Diagnosis Code I72.9

      Aneurysm of unspecified site

        2016 2017 2018 2019 2020 Billable/Specific Code
      • endocardial I33.0 (any valve)
    • endocardial, infective I33.0 (any valve)
  • Arthropathy M12.9
    - see also Arthritis
    ICD-10-CM Diagnosis Code M12.9

    Arthropathy, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    • in (due to)
      • infective endocarditis I33.0
    • reactive M02.9
      ICD-10-CM Diagnosis Code M02.9

      Reactive arthropathy, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code Manifestation Code
      • in (due to)
        • infective endocarditis I33.0
  • Disorder (of) - see also Disease
    • glomerular (in) N05.9
      ICD-10-CM Diagnosis Code N05.9

      Unspecified nephritic syndrome with unspecified morphologic changes

        2016 2017 2018 2019 2020 Billable/Specific Code
      • subacute bacterial endocarditis I33.0
  • Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) I38
    ICD-10-CM Diagnosis Code I38

    Endocarditis, valve unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Includes
    • endocarditis (chronic) NOS
    • valvular incompetence NOS
    • valvular insufficiency NOS
    • valvular regurgitation NOS
    • valvular stenosis NOS
    • valvulitis (chronic) NOS
    Type 1 Excludes
    • congenital insufficiency of cardiac valve NOS (Q24.8)
    • congenital stenosis of cardiac valve NOS (Q24.8)
    • endocardial fibroelastosis (I42.4)
    • endocarditis specified as rheumatic (I09.1)
    • acute or subacute I33.9
      ICD-10-CM Diagnosis Code I33.9

      Acute and subacute endocarditis, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Acute endocarditis NOS
      • Acute myoendocarditis NOS
      • Acute periendocarditis NOS
      • Subacute endocarditis NOS
      • Subacute myoendocarditis NOS
      • Subacute periendocarditis NOS
      • infective I33.0
    • due to
      • Serratia marcescens I33.0
    • mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea) I05.9
      ICD-10-CM Diagnosis Code I05.9

      Rheumatic mitral valve disease, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Rheumatic mitral (valve) disorder (chronic) NOS
      • active or acute I01.1
        ICD-10-CM Diagnosis Code I01.1

        Acute rheumatic endocarditis

          2016 2017 2018 2019 2020 Billable/Specific Code
        Applicable To
        • Any condition in I00 with endocarditis or valvulitis
        • Acute rheumatic valvulitis
        • bacterial I33.0
    • bacterial I33.0 (acute) (any valve) (subacute)
    • constrictive I33.0
    • infectious or infective I33.0 (acute) (any valve) (subacute)
    • lenta I33.0 (acute) (any valve) (subacute)
    • malignant I33.0 (acute) (any valve) (subacute)
    • mycotic I33.0 (acute) (any valve) (subacute)
    • pneumococcal I33.0 (acute) (any valve) (subacute)
    • purulent I33.0 (acute) (any valve) (subacute)
    • septic I33.0 (acute) (any valve) (subacute)
    • streptococcal I33.0 (acute) (any valve) (subacute)
    • suppurative I33.0 (acute) (any valve) (subacute)
    • ulcerative I33.0 (acute) (any valve) (subacute)
    • vegetative I33.0 (acute) (any valve) (subacute)
  • Glomerulonephritis N05.9
    - see also Nephritis
    ICD-10-CM Diagnosis Code N05.9

    Unspecified nephritic syndrome with unspecified morphologic changes

      2016 2017 2018 2019 2020 Billable/Specific Code
    • in (due to)
      • subacute bacterial endocarditis I33.0
  • Infection, infected, infective (opportunistic) B99.9
    ICD-10-CM Diagnosis Code B99.9

    Unspecified infectious disease

      2016 2017 2018 2019 2020 Billable/Specific Code
    • endocardium I33.0
  • Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) N05.9
    ICD-10-CM Diagnosis Code N05.9

    Unspecified nephritic syndrome with unspecified morphologic changes

      2016 2017 2018 2019 2020 Billable/Specific Code
    • due to
      • subacute bacterial endocarditis I33.0
  • Node(s) - see also Nodule
    • Osler's I33.0
  • Osler's nodes I33.0
  • SBE I33.0 (subacute bacterial endocarditis)
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
    • valve, heart I33.0
  • Vegetation, vegetative
    • endocarditis I33.0 (acute) (any valve) (subacute)
    • heart I33.0 (mycotic) (valve)

ICD-10-CM Codes Adjacent To I33.0
I31 Other diseases of pericardium
I31.0 Chronic adhesive pericarditis
I31.1 Chronic constrictive pericarditis
I31.2 Hemopericardium, not elsewhere classified
I31.3 Pericardial effusion (noninflammatory)
I31.4 Cardiac tamponade
I31.8 Other specified diseases of pericardium
I31.9 Disease of pericardium, unspecified
I32 Pericarditis in diseases classified elsewhere
I33 Acute and subacute endocarditis
I33.0 Acute and subacute infective endocarditis
I33.9 Acute and subacute endocarditis, unspecified
I34 Nonrheumatic mitral valve disorders
I34.0 Nonrheumatic mitral (valve) insufficiency
I34.1 Nonrheumatic mitral (valve) prolapse
I34.2 Nonrheumatic mitral (valve) stenosis
I34.8 Other nonrheumatic mitral valve disorders
I34.9 Nonrheumatic mitral valve disorder, unspecified
I35 Nonrheumatic aortic valve disorders
I35.0 Nonrheumatic aortic (valve) stenosis
I35.1 Nonrheumatic aortic (valve) insufficiency

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.