Refer to the ICD-10-CM Official Guidelines I.C.9.a.2 which states: The appropriate code from category ________ should be used as a secondary code with a code from category ________ to identify the stage of chronic kidney disease.

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According to the ICD-10-CM Official Guidelines I.C.9.a.2, the appropriate code from category N18 should be used as a secondary code with a code from category I12 to identify the stage of chronic kidney disease. Therefore, the best choice is D.