Final answer:
The patient's SNF stay will be covered under Medicare A.
Step-by-step explanation:
The circumstances described in the question qualify the patient's SNF stay to be covered under Medicare A.
Medicare has two parts, and Part A specifically pays for hospital charges for individuals eligible for Social Security benefits. In this case, the patient is 70 years old and has been at home for 10 days after spending 7 days in the hospital. Medicare A is funded by payroll deductions and matching contributions from the patient's employer.
This means that the patient's SNF stay will be covered by Medicare A, which is the correct answer from the options provided.