2025 ICD-10-CM Diagnosis Code I25.9

Chronic ischemic heart disease, unspecified

• I25.9 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 I25.9 became effective on October 1, 2024.
• This is the American ICD-10-CM version of I25.9 – other international versions of ICD-10 I25.9 may differ.

Applicable To

• Ischemic heart disease (chronic) NOS

The following code(s) above I25.9 contain annotation back-references

 that may be applicable to I25.9:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I25  Chronic ischemic heart disease

Approximate Synonyms

• Chronic ischemic heart disease

ICD-10-CM I25.9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

• 302 Atherosclerosis with mcc
• 303 Atherosclerosis without mcc

Convert I25.9 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

Code annotations containing back-references to I25.9:

• Type 1 Excludes: I24.9

Diagnosis Index entries containing back-references to I25.9:

• DeformityQ89.9
  • artery (congenital) (peripheral) Q27.9
    • coronary (acquired) I25.9
  • coronary artery (acquired) I25.9
• Disease, diseased – see also Syndrome
  • heart (organic) I51.9
    • ischemic (chronic or with a stated duration of over 4 weeks) I25.9
• Ischemia, ischemicI99.8
  • heart (chronic or with a stated duration of over 4 weeks) I25.9
  • myocardium, myocardial (chronic or with a stated duration of over 4 weeks) I25.9
  • supply (coronary) I25.9 – see also Angina