Alan J. Calhoun, MD
Internal Medicine Physician · Amherst, MA
Alan J. Calhoun, MD is an internal medicine physician with a practice address in Amherst, Massachusetts, and NPI 1740259993, issued on Mar 17, 2006. Check the license (Massachusetts 42663, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Alan J. Calhoun
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 42663 MA
Self-reported in NPPES; status is on the state search - Practice location
- 150 Infirmary Way, Amherst, MA 01003
- Phone
- (413) 577-5000
- Enumerated
- Mar 17, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (413) 577-5440
- Entity
- Type 1 · individual
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Verify Alan J. Calhoun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 42663Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Alan J. Calhoun among 6,825 internal medicine physician records in Massachusetts
Alan J. Calhoun, MD is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileNo · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2026 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
13 internal medicine physician records list a practice address in Amherst
They are 13 of the 769 NPPES records with a practice address in Amherst, and 6,825 internal medicine physician records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 6,825 in Massachusetts → Every provider in Amherst → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michelle Duffelmeyer, MDAmherst, MA 010031669486395
- Charles Hinckley, MDAmherst, MA 010031841238649
- Constance Lentz, MDAmherst, MA 010031003883513
- Rachel Andres, M.D.Pelham, MA 010021710272943
- Alan Berkenwald, MDAmherst, MA 010021033188636
- Lesley Harrington, MDAmherst, MA 010021326002833
- Samah Jafari, M.D.Amherst, MA 010021972757946
- Donald Lundgren, M.D.Amherst, MA 010021205957354
Common questions
What is Alan J. Calhoun, MD's NPI number?
Alan J. Calhoun, MD's National Provider Identifier (NPI) is 1740259993, issued on Mar 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Alan J. Calhoun, MD located?
The NPPES record lists a practice address at 150 Infirmary Way, Amherst, MA, 01003. Phone: (413) 577-5000. Providers update this record themselves, so call before visiting.
How can I verify Alan J. Calhoun, MD's license?
NPPES lists Massachusetts license number 42663, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.