Change: CHF is now unspecified heart failure.
When you leaf through your ICD-10 coding manual looking for a heart failure diagnosis, you'll be happy to see a structure that's pretty similar to what you're used to in ICD-9.
The I50 (Heart failure) category is very similar to ICD-9's 428 (Heart failure) category. All the same diagnoses are here, in just a slightly different sequence.
I50.1 (Left ventricular failure) starts off the list of codes in this ICD-10 category. You'll find that congestive heart failure (CHF) has been added into the diagnoses reported by ICD-10 code I50.9 (Heart failure, unspecified) rather than having it's own stand-alone code as it does in ICD-9.
The remaining I50 subcategory codes include:
Each of these codes has fifth digit choices to indicate unspecified, acute, chronic, or acute on chronic heart failure, just as the corresponding ICD-9 codes do.
Note that "congestive" is a non-essential modifier in I50.2-I50.4. That means that congestive heart failure will not have to be coded additionally, when present.
