Physician Profile
Margaret Callahan, MD
Unclaimed ProfileAbout Dr. Callahan
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Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (860) 679-2100
- Email not available
Practice Locations
263 FARMINGTON AVE
Farmington, CT 06030
1275 York Ave
New York, NY 10065
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other oncologists in Farmington 3
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 8 related providers in 1 group
Class of 2007 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. Callahan specialize in?
Dr. Callahan is an oncologist in Farmington, CT. That is the designation recorded for this NPI in the federal registry, where it is listed as “Medical Oncology”.
NPI registry
Where is Dr. Callahan located?
Dr. Callahan is listed at 263 Farmington Ave, Farmington, CT 06030. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Callahan's phone number?
The number on file is (860) 679-2100. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Callahan's NPI number?
Dr. Callahan's National Provider Identifier is 1508098534. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Callahan go to medical school?
Dr. Callahan attended Other, graduating in 2007. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Callahan been practicing?
Dr. Callahan has 19 years experience. Calculated from a graduation year of 2007, reported in the CMS National Downloadable File.
CMS public data
Has Dr. Callahan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Callahan. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.