Apex domains cannot have CNAME records.
Question and response
Question
dig nypractices.com. NS
Answer
nypractices.com. 1 NS ns2.nypractices.com.
nypractices.com. 1 NS ns1.nypractices.com.
Authority
The response has no authority records.
Additional
ns1.nypractices.com. 1 A 69.30.244.138
ns2.nypractices.com. 1 A 69.30.244.140
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0