NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alan J. Calhoun, MD

Internal Medicine Physician in Amherst, MA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1740259993

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Alan J. Calhoun
Credential MD
Sex Male
Practice address 150 Infirmary Way, Amherst, MA, 01003
Phone (413) 577-5000
Fax (413) 577-5440
Enumeration date Mar 17, 2006
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 42663 (MA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
042663 Other MA TUFTS
699995 Other MA HARVARD PILGRIM
I01019 Other MA BCBSMA
1130362 Other MA AETNA
187691 Other MA HEALTHSOURCE
24832 Other MA HEALTH NEW ENGLAND
426631 Other MA CONNECTICARE
1027468001 Other MA CIGNA

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Alan Calhoun practice?
The practice location on file with NPPES is in Amherst, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Alan Calhoun?
The National Provider Identifier (NPI) for Alan Calhoun is 1740259993, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.