I40
Non-billableAcute myocarditis
Acute myocarditis
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Includes
Conditions included under this code
- subacute myocarditis
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •systemic connective tissue disordersM30-M36
- •transient cerebral ischemic attacks and related syndromesG45
Child Codes (4)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(8)
Frequently Asked Questions
What is the ICD-10 code for acute myocarditis?
The ICD-10-CM code for acute myocarditis is I40. The full clinical description is "Acute myocarditis". I40 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code I40 mean?
ICD-10-CM code I40 represents “Acute myocarditis”. It is classified under Chapter 9: Diseases of the Circulatory System and is a non-billable header code. Use a more specific child code for billing purposes.
Is I40 a billable code?
No, I40 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 4 child codes under I40.
What chapter is I40 in?
I40 is in Chapter 9: Diseases of the Circulatory System (codes I00-I99).
What codes cannot be used with I40?
I40 has Excludes1 notes indicating codes that cannot be used together with it, including: acute rheumatic myocarditis (I01.2).
What are the subcategories under I40?
I40 has 4 child codes, including: I40.0 (Infective myocarditis), I40.1 (Isolated myocarditis), I40.8 (Other acute myocarditis), I40.9 (Acute myocarditis, unspecified).
What are the UMLS CUIs for I40?
I40 is linked to 2 UMLS Concept Unique Identifiers: C0155686, C3463914. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does I40 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like acute myocarditis affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of I40?
I40 maps to the ICD-11 code: BC42.Z (Myocarditis, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.