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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ALAN J. CALHOUN MD
NPI 1740259993
Internal Medicine in Amherst, MA

Active since March 17, 2006
150 INFIRMARY WAY, AMHERST, MA 01003(413) 577-5000(413) 577-5440 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Alan J. Calhoun Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALAN J. CALHOUN MD (NPI 1740259993) is an individual internal medicine provider in Amherst, Massachusetts, licensed in Massachusetts (42663) and active in the NPI registry since March 2006.

NPPES Registry Identity

NPI1740259993
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameALAN J. CALHOUNCredential: MD
Location Address150 INFIRMARY WAYAmherst, MA 01003-9288
Mailing Address150 Infirmary WayAmherst, MA 01003-9288 · (413) 577-5000 · Fax (413) 577-5440
Phone(413) 577-5000
Fax(413) 577-5440
Sole ProprietorNo
Enumeration DateMarch 17, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1740259993 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MA · 42663
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
150 INFIRMARY WAY, Amherst, MA 01003
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Other Identifiers 8

Other042663MA · Tufts
Other699995MA · Harvard Pilgrim
OtherI01019MA · Bcbsma
Other1130362MA · Aetna
Other187691MA · Healthsource
Other24832MA · Health New England
Other426631MA · Connecticare
Other1027468001MA · Cigna

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CONSTANCE B. LENTZ MD
Internal Medicine
150 INFIRMARY WAY
AMHERST, MA 01003
Hampshire County (413) 577-5000
DR. LISA MARIE LAZARZ-CIESLA MD
Family Medicine
150 INFIRMARY WAY
AMHERST, MA 01003
Hampshire County (413) 577-5000
MRS. MARLO LAGRANT
Physical Therapist
150 INFIRMARY WAY
AMHERST, MA 01003
Hampshire County (413) 577-5000
UMASS HEALTH SERVICES AMHERST
Clinic/Center (Urgent Care)
150 INFIRMARY WAY
AMHERST, MA 01003
Hampshire County (413) 577-5000
GREGORY W. LITTLE MD
Pediatrics
150 INFIRMARY WAY
AMHERST, MA 01003
Hampshire County (413) 577-5000
DR. PATRICIA A BARROWS PH.D.
Psychologist
150 INFIRMARY WAY
AMHERST, MA 01003
Hampshire County (413) 577-5000
CLAIRE L. DWYER PT
Physical Therapist
150 INFIRMARY WAY
AMHERST, MA 01003
Hampshire County (413) 577-5000
KAREN ANN KALMAKIS NP
Nurse Practitioner
150 INFIRMARY WAY, UNIVERSITY HEALTH SERVICES
AMHERST, MA 01003
Hampshire County (413) 577-5000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Alan Calhoun's NPI number?

The NPI number for Alan Calhoun is 1740259993. It was assigned to this individual provider in the NPPES registry on March 17, 2006.

Where is Alan Calhoun located?

Alan Calhoun practices at 150 Infirmary Way, Amherst, MA 01003. The listed phone number is (413) 577-5000.

What is Alan Calhoun's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Alan Calhoun was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 36 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.