Dr. Brian Terence Callahan Jr., M.D.
Dr. Brian Terence Callahan Jr. is a Surgery Physician provider (Surgery) practicing in Concord, MA, registered in the NPPES registry with NPI 1174558217 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1174558217 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Brian Terence Callahan Jr. |
| Credential | M.D. |
| Sex | Male |
| Practice address | 131 ORNAC, Concord, MA, 01742 |
| Phone | 9782873547 |
| Enumeration date | 2006-07-11 |
| Last updated in NPPES | 2014-02-20 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 208600000X | Surgery Physician | Primary | 60166 | MA |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: Brian Callahan, M.D. NPI: 1174558217 Taxonomy: 208600000X (Surgery Physician) Address: 131 ORNAC, Concord, MA, 01742
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1962408765 | Hytho Pantazelos | Individual | Plastic Surgery Physician | Concord, MA |
| 1588662407 | Stephen Schloss | Individual | Urology Physician | Concord, MA |
| 1396744777 | Emerson Urological Associates, Inc. | Organization | Urology Physician | Concord, MA |
| 1871587501 | Susan L. Cahill, MD, PC | Organization | Surgery Physician | Concord, MA |
| 1558355131 | Susan Cahill | Individual | Surgery Physician | Concord, MA |
| 1023004330 | Daniel Vogel | Individual | Otolaryngology Physician | Concord, MA |
| 1619965332 | Andrea Resciniti | Individual | Surgery Physician | Concord, MA |
| 1285615310 | Meena Mehta | Individual | Pulmonary Disease Physician | Concord, MA |
Verify this record
Cross-check NPI 1174558217 against the authoritative CMS record: view Dr. Brian Terence Callahan Jr. on the official NPPES registry .
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 or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2014-02-20.