All ICD10 Codes

I40

Non-Billable
ChapterI00–I99
Rankcategory
Official Description

Acute myocarditis

Use a more specific code (4 billable)
I40.0Infective myocarditisI40.1Isolated myocarditisI40.8Other acute myocarditisI40.9Acute myocarditis, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).

CH9 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Instructional Notes

Includes
  • subacute myocarditis
Excludes1(Not coded here. Use a different code.)
  • acute rheumatic myocarditis (I01.2)

Clinical Hierarchy

BillableHas subcodes
CH9Diseases of the circulatory system (I00-I99)
I30-I5AOther forms of heart disease (I30-I5A)
I40Acute myocarditisNot billable
I40.0Infective myocarditisBillable
I40.1Isolated myocarditisBillable
I40.8Other acute myocarditisBillable
I40.9Acute myocarditis, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I40:

chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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