2025 ICD-10-CM Diagnosis Code I51.9

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Heart disease, unspecified

  • I51.9 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 I51.9 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I51.9 – other international versions of ICD-10 I51.9 may differ.

The following code(s) above I51.9 contain annotation back-references

 that may be applicable to I51.9:

  • I00-I99  Diseases of the circulatory system
  • I51  Complications and ill-defined descriptions of heart disease

Approximate Synonyms

  • Cardiac disease postpartum
  • Chronic left ventricular systolic dysfunction
  • Chronic systolic dysfunction of left ventricle
  • Diastolic dysfunction
  • Diastolic dysfunction (heart condition)
  • Diastolic dysfunction, left ventricle
  • Heart disease during pregnancy
  • Heart disease in childbirth
  • Heart disease in pregnancy
  • Left ventricular diastolic dysfunction
  • Left ventricular systolic dysfunction
  • Postpartum (after childbirth) heart disease
  • Right ventricular systolic dysfunction
  • Right ventricular systolic dysfunction without heart failure
  • Systolic dysfunction, left ventricle

Clinical Information

  • Any deviation from the normal structure or function of the cardiac system that is manifested by a characteristic set of symptoms and signs.
  • If you’re like most people, you think that heart disease is a problem for other folks. But heart disease is the number one killer in the United States It is also a major cause of disability. There are many different forms of heart disease. The most common cause of heart disease is narrowing or blockage of the coronary arteries, the blood vessels that supply blood to the heart itself. This is called coronary artery disease and happens slowly over time. It’s the major reason people have heart attacks. Other kinds of heart problems may happen to the valves in the heart, or the heart may not pump well and cause heart failure. Some people are born with heart disease. You can help reduce your risk of heart disease by taking steps to control factors that put you at greater risk:
    • control your blood pressure
    • lower your cholesterol
    • don’t smoke
    • get enough exercise
  • Impairment of health or a condition of abnormal functioning of the heart.
  • Pathological conditions involving the heart including its structural and functional abnormalities.

ICD-10-CM I51.9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 302 Atherosclerosis with mcc
  • 303 Atherosclerosis without mcc

Convert I51.9 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 I51.9:

Diagnosis Index entries containing back-references to I51.9:

  • Cardiopathy I51.9 – see also Disease, heart
  • Complication(s) (from) (of)
    • heart I51.9
  • Disease, diseased – see also Syndrome
    • heart (organic) I51.9
      • cryptogenic I51.9
  • Dysfunction
    • ventricular I51.9
  • Lesion(s) (nontraumatic)
    • cardiac I51.9 – see also Disease, heart
  • Morbus – see also Disease
    • cordis I51.9 – see also Disease, heart
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