I23.6 vs I51.3
I23.6 and I51.3 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on I23.6
thrombosis of atrium, auricular appendage, and ventricle not specified as current complication following acute myocardial infarction (I51.3)
I23.6
Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
Billable
- Chapter 9
- Diseases of the circulatory system
- Section
- I20-I25
Indexed under
- Thrombosis, thrombotic › atrium, auricular › following acute myocardial infarction (bland) (multiple) (progressive) (silent) (vessel)
- Thrombosis, thrombotic › ventricle › following acute myocardial infarction (bland) (multiple) (progressive) (silent) (vessel)
- Complication › following › acute myocardial infarction NEC › atrial › thrombosis (s) (from) (of)
- Complication › following › acute myocardial infarction NEC › thrombosis › atrium (s) (from) (of)
- Complication › following › acute myocardial infarction NEC › thrombosis › auricular appendage (s) (from) (of)
I51.3
Intracardiac thrombosis, not elsewhere classified
BillableUnspecified
- Chapter 9
- Diseases of the circulatory system
- Section
- I30-I5A
Use when the record says
- Apical thrombosis (old)
- Atrial thrombosis (old)
- Auricular thrombosis (old)
- Mural thrombosis (old)
- Ventricular thrombosis (old)
Indexed under
- Thrombosis, thrombotic › intracardiac NEC (bland) (multiple) (progressive) (silent) (vessel)
- Clot › heart › not resulting in infarction (blood)
- Embolism › cardiac › not resulting in infarction (multiple) (paradoxical)
- Embolism › heart › not resulting in infarction (multiple) (paradoxical)
- Ischemia, ischemic › myocardium, myocardial › acute, without myocardial infarction
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027