Alexander N. Greiner, MD

From the records

Specialty

Allergist

Records

Medicare records: allergy/immunology (October 2026).

Medicare

Accepts the Medicare-approved amount as payment in full (Medicare assignment), according to CMS’s file. This applies to Original Medicare; Medicare Advantage plans have their own networks. What assignment means

Telehealth

Medicare’s file shows recent telehealth visits. It doesn’t mean every visit can be by video.

Medical school

State University of Ny Upstate Medical University, graduated 1998 (Medicare records)

Registry record

Last updated March 2016

NPI

1609801299 (national provider registry)

A listing isn’t a check of a license or board certification, and it doesn’t tell you whether a doctor is taking new patients or accepts your insurance. Call the practice. How we list doctors · Checking your insurance

Is this your listing?

If you’re this doctor or work at their practice, claim the listing to add details such as languages, a website and a booking link. It’s free, and it never changes where a doctor appears in our lists.