I33.9

Billable

Acute and subacute endocarditis, unspecified

I33.9 is the ICD-10-CM code for Acute and subacute endocarditis, unspecified. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
I00-I99
Parent
I33
Edition
FY2026

I00-I99 Diseases of the circulatory system

Includes

  • Acute endocarditis NOS
  • Acute myoendocarditis NOS
  • Acute periendocarditis NOS
  • Subacute endocarditis NOS
  • Subacute myoendocarditis NOS
  • Subacute periendocarditis NOS

Frequently asked questions

What is ICD-10 code I33.9?
I33.9 is the ICD-10-CM code for "Acute and subacute endocarditis, unspecified". It falls under I00-I99 Diseases of the circulatory system.
Is I33.9 a billable code?
Yes — I33.9 is a billable, specific ICD-10-CM code valid for reimbursement.

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

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