ICD-10-CM 2027
ICD-10 code for Preponderance
From the official ICD-10-CM alphabetic index entry “Preponderance, left or right ventricular”. Page updated September 29, 2026.
About coding Preponderance
The ICD-10-CM code for Preponderance is I51.7 (Cardiomegaly).
Within I51 (complications and ill-defined descriptions of heart disease), I51.7 is specifically for Cardiomegaly. Related codes cover cardiac septal defect, acquired (I51.0), rupture of chordae tendineae, not elsewhere classified (I51.1), rupture of papillary muscle, not elsewhere classified (I51.2), intracardiac thrombosis, not elsewhere classified (I51.3), myocarditis, unspecified (I51.4), myocardial degeneration (I51.5), other ill-defined heart diseases (I51.8) and heart disease, unspecified (I51.9).
Don't report I51.7 together with the conditions in its Excludes1 note: cardiomegaly due to hypertension (I11.-) and cardiomegaly due to hypertension and chronic kidney disease (I13.-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for I51.7)
Common questions about Preponderance ICD-10 codes
What is the ICD-10 code for Preponderance?
- I51.7 — Cardiomegaly.
Is I51.7 billable?
- Yes. I51.7 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I51.7 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I51.7 as a principal diagnosis.
Is I51.7 a CC or MCC?
- No. I51.7 is neither a CC nor an MCC under MS-DRG v44.0.