I33.0 Acute and subacute infective endocarditis

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

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 code

• code (B95-B97) to identify infectious agent

Applies from I33 Acute and subacute endocarditis

Excludes1 (never code together)

• acute rheumatic endocarditis (I01.1)
• endocarditis NOS (I38)

MS-DRG index

Defines the logic of DRG(s) 288-290 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 421.0 Acute and subacute bacterial endocarditis (approximate)

Code annotations containing back-references to I33.0

Back-references to I33.0

• Code First: I76 Septic arterial embolism ("infective endocarditis (I33.0)")
• Code First: M02 Postinfective and reactive arthropathies ("infective endocarditis (I33.0)")

Diagnosis Index entries for I33.0

• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › endocardial, infective (any valve)
• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › infective › endocardial (any valve)
• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › mycotic › endocardial (any valve)
• Arthropathy › in (due to) › infective endocarditis
• Arthropathy › reactive › in (due to) › infective endocarditis
• Disorder (of) › glomerular (in) › subacute bacterial endocarditis
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › acute or subacute › infective
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › bacterial (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › constrictive
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › due to › Serratia marcescens
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › infectious or infective (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › lenta (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › malignant (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea) › active or acute › bacterial
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › mycotic (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › pneumococcal (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › purulent (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › septic (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › streptococcal (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › suppurative (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › ulcerative (acute) (any valve) (subacute)
• Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › vegetative (acute) (any valve) (subacute)
• Glomerulonephritis › in (due to) › subacute bacterial endocarditis
• Infection, infected, infective (opportunistic) › endocardium
• Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) › due to › subacute bacterial endocarditis
• Node (s) › Osler's
• Osler's nodes
• SBE (subacute bacterial endocarditis)
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › valve, heart
• Vegetation, vegetative › endocarditis (acute) (any valve) (subacute)
• Vegetation, vegetative › heart (mycotic) (valve)

Nearby codes

• I33 Acute and subacute endocarditis
• I33.0 Acute and subacute infective endocarditis (this code)
• I33.9 Acute and subacute endocarditis, unspecified