ICD-10-CM Codes
I00-I99
I30-I5A
I40-
2023 ICD-10-CM Diagnosis Code I40

2023 ICD-10-CM Diagnosis Code I40

Acute myocarditis

2016

2017

2018

2019

2020

2021

2022

2023

Non-Billable/Non-Specific Code

I40 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
The 2023 edition of ICD-10-CM I40 became effective on October 1, 2022.
This is the American ICD-10-CM version of I40 - other international versions of ICD-10 I40 may differ.

Type 1 Excludes

Type 1 Excludes Help

A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as I40. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

acute rheumatic myocarditis (
ICD-10-CM Diagnosis Code I01.2
Acute rheumatic myocarditis
Applicable To
- Any condition in I00 with myocarditis
I01.2
)

Includes

Includes Help

"Includes" further defines, or give examples of, the content of the code or category.

subacute myocarditis

The following code(s) above I40 contain annotation back-references

Annotation Back-References

In this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to I40:

I00-I99
2023 ICD-10-CM Range I00-I99
Diseases of the circulatory system
Type 2 Excludes
- 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.-)
Diseases of the circulatory system

Code History

2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
2017 (effective 10/1/2016): No change
2018 (effective 10/1/2017): No change
2019 (effective 10/1/2018): No change
2020 (effective 10/1/2019): No change
2021 (effective 10/1/2020): No change
2022 (effective 10/1/2021): No change
2023 (effective 10/1/2022): No change

Code annotations containing back-references to I40:

Code Also: M35.81

ICD-10-CM Diagnosis Code M35.81
Multisystem inflammatory syndrome
Applicable To
- MIS-A
- MIS-C
- Multisystem inflammatory syndrome in adults
- Multisystem inflammatory syndrome in children
- Pediatric inflammatory multisystem syndrome
- PIMS
Code First
- , if applicable, COVID-19 (U07.1)
Code Also
- any associated complications such as:
- acute hepatic failure (K72.0-)
- acute kidney failure (N17.-)
- acute myocarditis (I40.-)
- acute respiratory distress syndrome (J80)
- cardiac arrhythmia (I47-I49.-)
- pneumonia due to COVID-19 (J12.82)
- severe sepsis (R65.2-)
- viral cardiomyopathy (B33.24)
- viral pericarditis (B33.23)
Use Additional
- code, if applicable, for:
- exposure to COVID-19 or SARS-CoV-2 infection (Z20.822)
- personal history of COVID-19 (Z86.16)
- post COVID-19 condition (U09.9)
Code First: I5A

ICD-10-CM Diagnosis Code I5A
Non-ischemic myocardial injury (non-traumatic)
Applicable To
- Acute (non-ischemic) myocardial injury
- Chronic (non-ischemic) myocardial injury
- Unspecified (non-ischemic) myocardial injury
Code First
- the underlying cause, if known and applicable, such as:
- acute kidney failure (N17.-)
- acute myocarditis (I40.-)
- cardiomyopathy (I42.-)
- chronic kidney disease (CKD) (N18.-)
- heart failure (I50.-)
- hypertensive urgency (I16.0)
- nonrheumatic aortic valve disorders (I35.-)
- paroxysmal tachycardia (I47.-)
- pulmonary embolism (I26.-)
- pulmonary hypertension (I27.0, I27.2-)
- sepsis (A41.-)
- takotsubo syndrome (I51.81)
Type 1 Excludes
- acute myocardial infarction (I21.-)
- injury of heart (S26.-)
Type 2 Excludes
- other acute ischemic heart diseases (I24.-)
Type 1 Excludes: I51.4

ICD-10-CM Diagnosis Code I51.4
Myocarditis, unspecified
Applicable To
- Chronic (interstitial) myocarditis
- Myocardial fibrosis
- Myocarditis NOS
Type 1 Excludes
- acute or subacute myocarditis (I40.-)

ICD-10-CM Codes Adjacent To I40

I36.8 Other nonrheumatic tricuspid valve disorders

I36.9 Nonrheumatic tricuspid valve disorder, unspecified

I37 Nonrheumatic pulmonary valve disorders

I37.0 Nonrheumatic pulmonary valve stenosis

I37.1 Nonrheumatic pulmonary valve insufficiency

I37.2 Nonrheumatic pulmonary valve stenosis with insufficiency

I37.8 Other nonrheumatic pulmonary valve disorders

I37.9 Nonrheumatic pulmonary valve disorder, unspecified

I38 Endocarditis, valve unspecified

I39 Endocarditis and heart valve disorders in diseases classified elsewhere

I40 Acute myocarditis

I40.0 Infective myocarditis

I40.1 Isolated myocarditis

I40.8 Other acute myocarditis

I40.9 Acute myocarditis, unspecified

I41 Myocarditis in diseases classified elsewhere

I42 Cardiomyopathy

I42.0 Dilated cardiomyopathy

I42.1 Obstructive hypertrophic cardiomyopathy

I42.2 Other hypertrophic cardiomyopathy

I42.3 Endomyocardial (eosinophilic) disease

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

2023 ICD-10-CM Diagnosis Code I40

Acute myocarditis

Acute rheumatic myocarditis

Diseases of the circulatory system

Multisystem inflammatory syndrome

Non-ischemic myocardial injury (non-traumatic)

Myocarditis, unspecified