2025 ICD-10-CM Diagnosis Code I40.8

by

Other acute myocarditis

  • I40.8 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 I40.8 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I40.8 – other international versions of ICD-10 I40.8 may differ.

The following code(s) above I40.8 contain annotation back-references

 that may be applicable to I40.8:

  • I00-I99  Diseases of the circulatory system
  • I40  Acute myocarditis

Approximate Synonyms

  • Toxic myocarditis

ICD-10-CM I40.8 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 I40.8 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 I40.8:

  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) I51.4
    • acute or subacute (interstitial) I40.9
      • specified NEC I40.8
    • toxic I40.8
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