We actually have two questions going on here...
1. What are the requirements to code hypertensive heart disease with chronic kidney disease?
2. What are the requirements in coding diabetes with chronic kidney disease in an inpatient setting.
For question number 1, this is one of the few situations in which coders are supposed to code a relationship even if it is not specifically indicated as cause and effect in the medical record. Due to the nature of the process of hypertension and kidney disease, they are always to be assumed as related unless otherwise specified. So in other words, if the record states that a patient has hypertension and ESRD, the correct code assignment would be:
403.91
585.6
However, to code from the 404 category, the record would need to state that hypertensive heart disease (not just hypertension) along with chronic kidney disease. However, the cause and effect would still not need to be indicated in the medical record to use codes from this category. Just to clarify, hypertension and chronic kidney disease are always considered to be related.
The second question deals with diabetes and renal disease. In this case cause and effect needs to be documented. However, once it has been documented for an admission, you don't need to have it reiterated every day in order to code it as such. Many doctors don't rewrite every diagnosis on each day during an inpatient setting. Unless he would make a revision to the previous diagnosis (such as renal disease is found to be due to X), you have the prior documentation to allow you to code for the relationship between diabetes and renal manifestations.
Hope this helps!
diagnosis codes, diagnosis coding