Apex domains cannot have CNAME records.
Question and response
Question
dig medicarehospicebenefit.com. NS
Answer
medicarehospicebenefit.com. 5 NS ns-1099.awsdns-09.org.
medicarehospicebenefit.com. 5 NS ns-686.awsdns-21.net.
medicarehospicebenefit.com. 5 NS ns-248.awsdns-31.com.
medicarehospicebenefit.com. 5 NS ns-870.awsdns-44.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0