I23.4 vs I51.1
I23.4 and I51.1 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 I23.4
rupture of chordae tendineae not specified as current complication following acute myocardial infarction (I51.1)
I23.4
Rupture of chordae tendineae as current complication following acute myocardial infarction
Billable
- Chapter 9
- Diseases of the circulatory system
- Section
- I20-I25
Indexed under
- Laceration › chordae tendinae NEC › following acute myocardial infarction
- Rupture, ruptured › chordae tendineae NEC › following acute myocardial infarction
- Complication › following › acute myocardial infarction NEC › chordae tendinae rupture (s) (from) (of)
- Complication › following › acute myocardial infarction NEC › rupture › chordae tendineae (s) (from) (of)
I51.1
Rupture of chordae tendineae, not elsewhere classified
BillableUnspecified
- Chapter 9
- Diseases of the circulatory system
- Section
- I30-I5A
Indexed under
- Laceration › chordae tendinae NEC
- Rupture, ruptured › chordae tendineae NEC
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