CMS Contacts Database

 CONTACTS database seems to be lots of organizations (not persons at CMS).  For example you can get the Ombudsman for Aging Services in North Dakota.

https://www.cms.gov/contacts

Something called Coverage/InfoExchange as of May 2022 still lists an Excel "CMD" medical director directory with emails.

https://www.cms.gov/Medicare/Coverage/InfoExchange

CMS publishes an NCD REPORT TO CONGRESS.  As of May 2022, the most recent was CY2020.  Half of it is boilerplate rules.

https://www.cms.gov/Medicare/Coverage/InfoExchange/Reports