I40.9Billable

Acute myocarditis, unspecified

Chapter
9. Diseases of the circulatory system
Category
I40
Effective date
October 1, 2026

Related codes in category I40

I40Acute myocarditisI40.0Infective myocarditisYesI40.1Isolated myocarditisYesI40.8Other acute myocarditisYes

Frequently asked questions

What is ICD-10 code I40.9?

I40.9 is an ICD-10-CM diagnosis code for Acute myocarditis, unspecified.

Is I40.9 a billable code?

Yes. I40.9 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is I40.9 in?

I40.9 falls under Chapter 9: Diseases of the circulatory system.

When did I40.9 become effective?

I40.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to I40.9?

I40.9 belongs to category I40, which includes 4 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.