I40.8 – Other acute myocarditis

ICD-10-CM 2027 diagnosis code · Other forms of heart disease

Billable code

ICD-10-CM code I40.8
Code
I40.8 (claims format: I408)
Description
Other acute myocarditis
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
9. Diseases of the circulatory system (I00-I99)
Block
I30-I5A Other forms of heart disease
Parent codes
I40

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I40 – Acute myocarditis

Includes:
  • subacute myocarditis
Excludes1 (not coded here):
  • acute rheumatic myocarditis (I01.2)

Index terms for I40.8

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in I40

Frequently asked questions

What is ICD-10 code I40.8?

I40.8 is the ICD-10-CM code for other acute myocarditis, in the block I30-I5A (Other forms of heart disease).

Is I40.8 a billable code?

Yes. I40.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does I40.8 belong to?

It belongs to category I40 – Acute myocarditis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.