2025 ICD-10-CM Diagnosis Code I51.7

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Cardiomegaly

  • I51.7 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 I51.7 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I51.7 – other international versions of ICD-10 I51.7 may differ.

Applicable To

  • Cardiac dilatation
  • Cardiac hypertrophy
  • Ventricular dilatation

The following code(s) above I51.7 contain annotation back-references

 that may be applicable to I51.7:

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

Approximate Synonyms

  • Atrial enlargement
  • Atrial enlargement, left
  • Atrial enlargement, right
  • Bilateral enlargement of atria
  • Cardiomegaly (enlarged heart)
  • Hypertrophy or dilatation of right ventricle
  • Left atrial enlargement
  • Left ventricular dilatation
  • Left ventricular hypertrophy
  • Right atrial enlargement
  • Right ventricular enlargement
  • Ventricular enlargement, right

Clinical Information

  • Abnormal enlargement of the heart.
  • Enlargement of the heart due to chamber hypertrophy, an increase in wall thickness without an increase in the number of cells (myocytes, cardiac). It is the result of increase in myocyte size, mitochondrial and myofibrillar mass, as well as changes in extracellular matrix.
  • Enlargement of the heart, usually indicated by a cardiothoracic ratio above 0.50. Heart enlargement may involve the right, the left, or both heart ventricles or heart atria. Cardiomegaly is a nonspecific symptom seen in patients with chronic systolic heart failure (heart failure) or several forms of cardiomyopathies.
  • Hypertrophy or enlargement of the heart.

ICD-10-CM I51.7 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 302 Atherosclerosis with mcc
  • 303 Atherosclerosis without mcc

Convert I51.7 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 I51.7:

  • Type 2 Excludes: I42
  • Includes: I11

Diagnosis Index entries containing back-references to I51.7:

  • Athlete’s
    • heart I51.7
  • Cardiomegaly – see also Hypertrophy, cardiac
    • idiopathic I51.7
  • Hypertrophy, hypertrophic
    • cardiac (chronic) (idiopathic) I51.7
  • Preponderance, left or right ventricular I51.7
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