What Is the Correct Sequencing for Severe Sepsis in the ICD-10-CM

What is the correct sequencing for severe sepsis in the ICD-10-CM?

A) Severe sepsis can be coded as the primary code and then the systemic infection is coded because it is the underlying infection.
B) Severe sepsis is coded as the secondary code and never as the primary code.
C) Severe sepsis is coded as the primary code and does not require additional codes.
D) Severe sepsis is coded as the primary code because there are subcategories of it. The secondary code is the subcategory designated only after it has been confirmed by further testing.