Loading...

    Explore
    • Policy Monitoring
    • Live Policy Feed
    • Billing Codes
    • NPI Medicare & Medicaid
    • Healthcare Providers
    • Health Insurance Payers
    • States
    • Service Lines
    • Taxonomy Codes
    Lookup tools
    • Billing Code Lookup
    • CPT Modifier Lookup
    • Provider Taxonomy Code Lookup
    • Healthcare Provider & Facility Lookup
    • Health Insurance Payer Lookup
    • Payer Contact Directory

    Policy & Benchmark Tools

    • Prior Authorization Lookup
    • Coverage Criteria Lookup
    • Timely Filing Lookup
    • Billing Code Reimbursement Rates
    • Payer Comparison Dashboard
    • Facility Comparison Dashboard
    • All tools

    Company

    • About OpenPayer
    • Data Sources
    • Trek Health
    OpenPayerby Trek Health
    LinkedInYouTube

    © 2026 Trek Health. All rights reserved.

    OpenPayer is built and maintained by Trek Health.

    v1.0.28
    OpenPayerBilling CodesOther forms of heart diseaseICD-10-CM i33-acute-and-subacute-endocarditis
    Ask Trek AI about this page

    ICD-10-CM Code For Acute And Subacute Endocarditis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group I33 includes diagnoses for acute and subacute infectious endocarditis, covering infections of heart valves and the endocardial lining that may be native or prosthetic. These ICD-10-CM diagnosis codes are used to document clinical scenarios such as confirmed infective involvement of cardiac valves, presence of systemic complications like embolic events or heart failure, and prosthetic device infection. Accurate coding within the ICD-10-CM I33 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

    Customize your policy alerts

    Sign up for ICD-10-CM Code For Acute And Subacute Endocarditis: Group Overview policy alerts

    Get alerted when relevant policies change without checking for updates manually.

    Monitor payer policy activity

    Receive email alerts as soon as relevant payer policies are published or updated.

    ICD-10-CM I33: Acute And Subacute Endocarditis Overview

    This group includes diagnoses for acute and subacute infections of the heart valves and endocardial surface. These conditions affect the cardiovascular system and often involve microbial infection with potential for systemic emboli and heart failure. Accurate coding matters for clinical records and reimbursement because it captures disease severity and guides claim adjudication.

    Table of contents

    Progress1 / 6

    Explore openpayer tools

    • Billing CodesCPT, HCPCS, DRG & more
    • Reimbursement RatesCommercial vs. Medicare rate reports
    • ProvidersHospitals & facilities
    • PayersPlans & market footprint
    • Taxonomy CodesNUCC specialty codes
    • ModifiersCPT modifiers & usage
    • Prior AuthorizationPA policies by payer & drug
    • Timely FilingFiling deadlines by payer
    • Coverage CriteriaMedical necessity by payer
    • Payer ContactsClaims, PA & appeals contacts
    View all tools

    When to Use

    Use a code from this group when clinical documentation indicates infective involvement of cardiac valves or the endocardial surface consistent with acute or subacute endocarditis. Apply the specific code that reflects native versus prosthetic valve involvement and any documented complications or manifestations.

    ICD-10-CM Codes

    2 rows

    ICD-10-CM CodeDescription
    I33.0Acute and subacute infective endocarditis
    I33.9Acute and subacute endocarditis, unspecified

    DRG Codes

    8 rows

    DRG CodeDescription
    288Acute and Subacute Endocarditis with MCC
    289Acute and Subacute Endocarditis with CC
    290Acute and Subacute Endocarditis without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems
    974HIV with Major Related Condition with MCC
    975HIV with Major Related Condition with CC
    976HIV with Major Related Condition without CC/MCC

    Typical Clinical Scenarios

    • An adult patient presents to the emergency department with several days of high fevers, new-onset heart murmur, malaise, and signs of systemic embolization (e.g., focal neurologic deficit). Blood cultures are positive for streptococci and echocardiography shows vegetation on a native mitral valve, prompting admission for IV antibiotics and close monitoring; an acute infective endocarditis diagnosis from this group is assigned for the active infection. Typical codes: I33.0
    • An elderly patient with a recent history of treated bacteremia arrives with progressive heart failure symptoms over weeks, documented vegetation on echocardiogram, and subacute constitutional symptoms but no current positive blood cultures; the clinical picture represents subacute infective involvement requiring prolonged medical management and possible surgical evaluation, so a subacute or unspecified diagnosis from this group is used. Typical codes: I33.9
    • A patient hospitalized for ischemic stroke is found on workup to have infective valvular vegetations and active bacteremia identified as the source of embolic stroke; the infective process is managed concurrently with stroke care, and an acute infective endocarditis code from this group is assigned as a principal or secondary diagnosis reflecting the active cardiac infection contributing to the complication. Typical codes: I33.0

    Related Codes

    I30-ACUTE-PERICARDITIS

    ICD-10-CM Code For Acute Pericarditis: Group Overview

    I31-OTHER-DISEASES-OF-PERICARDIUM

    ICD-10-CM Code For Other Diseases Of Pericardium: Group Overview

    I32-PERICARDITIS-IN-DISEASES-CLASSIFIED-ELSEWHERE

    ICD-10-CM Code For Pericarditis In Diseases Classified Elsewhere: Group Overview

    I34-NONRHEUMATIC-MITRAL-VALVE-DISORDERS

    ICD-10-CM Code For Nonrheumatic Mitral Valve Disorders: Group Overview

    I35-NONRHEUMATIC-AORTIC-VALVE-DISORDERS

    ICD-10-CM Code For Nonrheumatic Aortic Valve Disorders: Group Overview

    I36-NONRHEUMATIC-TRICUSPID-VALVE-DISORDERS

    ICD-10-CM Code For Nonrheumatic Tricuspid Valve Disorders: Group Overview

    I37-NONRHEUMATIC-PULMONARY-VALVE-DISORDERS

    ICD-10-CM Code For Nonrheumatic Pulmonary Valve Disorders: Group Overview

    I38-ENDOCARDITIS-VALVE-UNSPECIFIED

    ICD-10-CM Code For Endocarditis Valve Unspecified: Group Overview

    I39-ENDOCARDITIS-AND-HEART-VALVE-DISORDERS

    ICD-10-CM Code For Endocarditis And Heart Valve Disorders In Diseases Classified Elsewhere: Group Overview

    I40-ACUTE-MYOCARDITIS

    ICD-10-CM Code For Acute Myocarditis: Group Overview

    Showing 1–10 of 23

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
    Published by

    Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

    Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.