If you understand the ICD-10-CM coding guidelines involving causal relationships and the word “with” in the Alphabetic Index of the ICD-10-CM coding manual, coding for hypertension and heart disease in ICD-10-CM should not be difficult.
Question: Patient has congestive heart failure due to hypertension. Assign the ICD-10-CM code(s).
Hypertension and Heart Disease
Hypertension is another term for high blood pressure and means the pressure inside the blood vessels is too high. The heart must work harder to pump against this pressure, and eventually, it leads to the thickening of the heart muscle, according to medlineplus.gov. Over time, this thickening can result in a lack of oxygen and weaken the heart and even heart failure.
According to the 2022 ICD-10-CM Coding Guidelines, the coder may assume a causal relationship between hypertension and heart involvement, because the two conditions are linked by the term “with” in the Alphabetic Index. Even if the documentation does not specifically state that the two conditions are related, we can and should code them as related…
Unless the documentation specifically states the conditions are not related.
For hypertension and conditions not specifically linked by relational terms such as “with,” “associated with” or “due to” in the classification, provider documentation must link the conditions in order to code them as related.
Locate and Verify
When looking up Hypertension in the Alphabetic Index, see Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)/with/heart failure (congestive) I11.0. In the Tabular, we can verify the correct code as:
I11.0, Hypertensive heart disease with heart failure
Note: There are only two codes listed under category I11, Hypertensive heart disease:
- I11.0, Hypertensive heart disease with heart failure
- I11.9, Hypertensive heart disease without heart failure
Another term listed under I11.0, Hypertensive heart disease with heart failure, is Hypertensive heart failure.
There is a note under I11.0 that states “Use additional code to identify type of heart failure (I50.-).”
When we go to I50.- in the Tabular, we see that the codes listed under category I50, Heart failure, are:
- I50.1, Left ventricular failure, unspecified
- I50.20‑I50.23 I50.2, Systolic (congestive) heart failure
- I50.30‑I50.33 I50.3, Diastolic (congestive) heart failure
- I50.40‑I50.43 I50.4, Combined systolic (congestive) and diastolic (congestive) heart failure
- I50.810‑I50.89 I50.8, Other heart failure
- I50.9, Heart failure, unspecified
The documentation in this coding scenario indicates the patient has congestive heart failure. There is no mention of the specific type of heart failure, such as systolic, diastolic, combined, etc.
When we go to I50.- in the Tabular, we can see that the appropriate code for congestive heart failure is:
I50.9, Heart failure, unspecified
Other terms listed under I50.9, Heart failure, unspecified, include:
- Cardiac, heart or myocardial failure NOS
- Congestive heart disease
- Congestive heart failure NOS
According to the “Code First” note at I50, heart failure due to hypertension (I11.0) should be sequenced before I50.9 for congestive heart failure.
Be sure to see the information above I10 that indicates for Hypertensive Diseases (I10-I16), we are to assign an additional code to identify tobacco use, dependence, exposure to, history of, or occupational exposure to tobacco. However, we cannot code for it here because it wasn’t documented.
There are also Includes, Excludes1, and Excludes2 notes that need to be reviewed and assigned, as applicable.
Note: This post has been reviewed and updated to reflect the FY 2022 ICD-10-CM coding guidelines. These guidelines will remain the same for FY 2023 and take effect on October 1, 2022.
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