2025 ICD-10-CM Diagnosis Code I51.3

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:

• Type 1 Excludes: I23.6

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)