According to ICD-10-CM guidelines, which category should be used as a secondary code with a code from the category for chronic kidney disease?

The correct choice is based on the specific guidelines for coding chronic kidney disease (CKD) in ICD-10-CM. Chronic kidney disease is categorized under N18, which includes different stages of CKD. According to the coding guidelines, when CKD is present along with hypertension, it often requires a combination of codes to fully capture the patient's condition.

In this instance, the appropriate secondary code for CKD when it is related to hypertension is found in the I12 category, which addresses hypertension with CKD. The combination of N18 and I12 indicates not only the presence of chronic kidney disease but also identifies any related hypertensive issues.

This coding approach ensures that both the underlying conditions are documented, which is essential for proper treatment planning and for accurate reimbursement. All other options do not align with this specific necessity of linking CKD with its complicating factors under the ICD-10-CM guidelines.