I33

Non-billable

Acute and subacute endocarditis

I33 is the ICD-10-CM code for Acute and subacute endocarditis. It is a non-billable category code — use a more specific child code such as I33.0 for billing.

Status
Header (non-billable)
Chapter
I00-I99
Subcodes
2
Edition
FY2026

I00-I99 Diseases of the circulatory system

Excludes1 — not coded here

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

Frequently asked questions

What is ICD-10 code I33?
I33 is the ICD-10-CM code for "Acute and subacute endocarditis". It falls under I00-I99 Diseases of the circulatory system.
Is I33 a billable code?
No — I33 is a non-billable header code. Use a more specific child code (such as I33.0) for billing.
What are the subcodes of I33?
I33 has 2 more specific child codes, including I33.0, I33.9.
What is excluded from I33?
Excludes1 (not coded here): acute rheumatic endocarditis (I01.1); endocarditis NOS (I38).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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