2025 ICD-10-CM Diagnosis Code I51.3

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Intracardiac thrombosis, not elsewhere classified

  • I51.3 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 I51.3 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I51.3 – other international versions of ICD-10 I51.3 may differ.

Applicable To

  • Apical thrombosis (old)
  • Atrial thrombosis (old)
  • Auricular thrombosis (old)
  • Mural thrombosis (old)
  • Ventricular thrombosis (old)

Type 1 Excludes

  • intracardiac thrombosis as current complication following acute myocardial infarction (I23.6)

The following code(s) above I51.3 contain annotation back-references

 that may be applicable to I51.3:

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

Approximate Synonyms

  • Left ventricular mural thrombus
  • Mural thrombus of heart following old myocardial infarction
  • Mural thrombus of heart left atrium
  • Mural thrombus of heart post old mi
  • Mural thrombus of left atrium
  • Mural thrombus of left ventricle
  • Mural thrombus of right atrium
  • Mural thrombus of right ventricle
  • Right atrial mural thrombus
  • Right ventricular mural thrombus

ICD-10-CM I51.3 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 302 Atherosclerosis with mcc
  • 303 Atherosclerosis without mcc

Convert I51.3 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 I51.3:

Diagnosis Index entries containing back-references to I51.3:

  • Clot (blood) – see also Embolism
    • heart – see also Infarct, myocardium
      • not resulting in infarction I51.3
  • Embolism (multiple) (paradoxical) I74.9
    • cardiac – see also Infarct, myocardium
      • not resulting in infarction I51.3
    • heart (fatty) – see also Infarct, myocardium
      • not resulting in infarction I51.3
  • Ischemia, ischemicI99.8
    • myocardium, myocardial (chronic or with a stated duration of over 4 weeks) I25.9
      • acute, without myocardial infarction I51.3
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) I82.90
    • atrium, auricular – see also Infarct, myocardium
      • not resulting in infarction I51.3
      • old I51.3
    • cardiac – see also Infarct, myocardium
      • not resulting in infarction I51.3
      • old I51.3
    • endocardial – see also Infarct, myocardium
      • not resulting in infarction I51.3
    • heart (chamber) – see also Infarct, myocardium
      • not resulting in infarction I51.3
      • old I51.3
    • intramural – see also Infarct, myocardium
      • not resulting in infarction I51.3
      • old I51.3
    • mural – see also Infarct, myocardium
      • not resulting in infarction I51.3
      • old I51.3
    • ventricle – see also Infarct, myocardium
      • old I51.3
    • intracardiac NEC I51.3 (apical) (atrial) (auricular) (ventricular) (old)
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