2025 ICD-10-CM Diagnosis Code I40

by

Acute myocarditis

  • I40 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2025 edition of ICD-10-CM I40 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I40 – other international versions of ICD-10 I40 may differ.

Type 1 Excludes

  • acute rheumatic myocarditis (I01.2)

Includes

  • subacute myocarditis

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

 that may be applicable to I40:

  • I00-I99  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
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Code annotations containing back-references to I40:

  • Code Also: M35.81
  • Code First: I5A
  • Type 1 Excludes: I51.4
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