Independent US Healthcare Provider Directory & Public Medical Database
Active NPI 1740259993 Individual Practitioner Male Practitioner

Dr. Alan J. Calhoun , MD

Internal Medicine • Amherst, MA

Professional Overview & Biography Verified Profile Summary

Dr. Alan Calhoun, MD is a registered healthcare professional specializing in Internal Medicine in Amherst, MA. Practice services are available at 150 INFIRMARY WAY under active NPI credentials.

Practice Location & Contact Primary Location

Practice Address

150 Infirmary Way

Amherst, MA 010039288

Telephone 4135775000
Fax 4135775440
Associated Practice Facility / Clinic
🏢 Umass Health Services Amherst Facility NPI 1487688677

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Amherst, MA

Active Practitioner
Practitioner Clinical Experience
Active
City Avg: 33.8 Yrs
State Avg: 29.3 Yrs
Regional Practice Density
14 Specialists

Practicing in Amherst, MA (7127 Statewide)

Telehealth Adoption Rate
28.6% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
67.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License MA 42663

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.

Additional State Medicaid & Healthcare Payer Identifiers

Commercial Insurance / Payer ID Tufts
042663 (MA)
Commercial Insurance / Payer ID Harvard Pilgrim
699995 (MA)
Commercial Insurance / Payer ID Bcbsma
I01019 (MA)
Commercial Insurance / Payer ID Aetna
1130362 (MA)
Commercial Insurance / Payer ID Healthsource
187691 (MA)
Commercial Insurance / Payer ID Health New England
24832 (MA)
Commercial Insurance / Payer ID Connecticare
426631 (MA)
Commercial Insurance / Payer ID Cigna
1027468001 (MA)

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

40 Associated Practitioners
Dr. Constance Lentz , MD

Internal Medicine

NPI 1003883513

Doctor of Medicine (M.D.)

NPI 1003966268

Doctor of Medicine (M.D.)

Marlo Lagrant

Physical Therapist

NPI 1013067396
NPI 1053388587

Doctor of Medicine (M.D.)

NPI 1063732923

Doctor of Philosophy (Ph.D.)

Claire Dwyer , PT

Physical Therapist

NPI 1083049761

Physical Therapist

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events
NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

📍
Updated Practice Location July 08, 2007

Registered at 150 INFIRMARY WAY, AMHERST, MA 010039288 (Tel: 4135775000)

📍
Updated Business Mailing Address July 08, 2007

Registered at 150 INFIRMARY WAY, AMHERST, MA 010039288 (Tel: 4135775000)

👤
Provider Name / Credentials Updated July 08, 2007

Recorded as ALAN CALHOUN, MD

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Internal Medicine (License #42663 in MA)

🟢
Initial NPI Registration & Enumeration March 17, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1740259993
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: March 17, 2006
Last Update: July 13, 2026
Sole Proprietor: No

Mailing Address

150 Infirmary Way

Amherst, MA 010039288

Phone: 4135775000

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.