ICD-10-CM 2027
ICD-10 code for Pneumococcal endocarditis
Acute and subacute infective endocarditis
From the official ICD-10-CM alphabetic index entry “Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › pneumococcal (acute) (any valve) (subacute)”. Page updated September 29, 2026.
About coding Pneumococcal endocarditis
The ICD-10-CM code for Pneumococcal endocarditis is I33.0 (Acute and subacute infective endocarditis).
Within I33 (acute and subacute endocarditis), I33.0 is specifically for acute and subacute infective endocarditis. Related codes cover unspecified (I33.9).
Use an additional code (B95-B97) to identify infectious agent.
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
Common questions about Pneumococcal endocarditis ICD-10 codes
What is the ICD-10 code for Pneumococcal endocarditis?
- I33.0 — Acute and subacute infective endocarditis.
Is I33.0 billable?
- Yes. I33.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I33.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I33.0 as a principal diagnosis.
Is I33.0 a CC or MCC?
- I33.0 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.