Acute myocarditis, unspecified
- I40.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2025 edition of ICD-10-CM I40.9 became effective on October 1, 2024.
- This is the American ICD-10-CM version of I40.9 – other international versions of ICD-10 I40.9 may differ.
The following code(s) above I40.9 contain annotation back-references
that may be applicable to I40.9:
Approximate Synonyms
- Acute myocarditis
ICD-10-CM I40.9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):
- 314 Other circulatory system diagnoses with mcc
- 315 Other circulatory system diagnoses with cc
- 316 Other circulatory system diagnoses without cc/mcc
- 974 Hiv with major related condition with mcc
- 975 Hiv with major related condition with cc
- 976 Hiv with major related condition without cc/mcc
Convert I40.9 to ICD-9-CMCode 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
- 2024 (effective 10/1/2023): No change
- 2025 (effective 10/1/2024): No change
Diagnosis Index entries containing back-references to I40.9:
- Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) I51.4
- active I40.9
- acute or subacute (interstitial) I40.9
- nonrheumatic, active I40.9
- parenchymatous I40.9
- Rupture, ruptured
- cardiac (auricle) (ventricle) (wall) I23.3
- infectional I40.9
- cardiac (auricle) (ventricle) (wall) I23.3