William Charles O'Callahan Jr., MD
William Charles O'Callahan Jr., MD is an Emergency Medicine in Holden, Massachusetts. Graduated from University of Massachusetts Medical School in 1990, 36 years ago. Practices with Urgent Care Specialists PC, an 11-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Massachusetts.
- Years since qualifying
- 36
- Trained at
- University of Massachusetts Medical School
- Licensed in
- MA
- In the registry since
- 2006
What do these letters mean?
- MD — Doctor of Medicine
- A physician who completed allopathic medical school.
Practice location Address checks out
5 Shrewsbury St Ste DHolden, MA 01520-1960
Phone: (508) 829-3800
Fax: (508) 829-3802
Show map & directions
Directions in Google Maps · Apple Maps · OpenStreetMap
Pin is approximate — placed at the ZIP-code centre, not the exact door.
Additional practice locations (3)
- 688 Bliss Road, Longmeadow, MA 01106-1534 — (413) 567-0011
- 2040 Boston Road, Wilbraham, MA 01095-1380 — (413) 599-3800
- 2040 Boston Rd Ste 5, Wilbraham, MA 01095-1380 — (413) 599-3800
Specialties & licences
| Emergency Medicine Physician (primary) | Taxonomy 207P00000X · Licence 79001 (MA) |
|---|
Record details
| NPI number | 1114964186 |
|---|---|
| Entity type | Individual (Type 1) |
| Gender | Male |
| Credentials | MD |
| Sole proprietor | No |
| NPI enumerated | May 31, 2006 |
| Last updated in NPPES | January 21, 2025 |
| Certification date | January 21, 2025 |
Medicare enrollment
| Medicare specialty | EMERGENCY MEDICINE |
|---|---|
| Medical school | UNIVERSITY OF MASSACHUSETTS MEDICAL SCHOOL |
| Graduated | 1990 (36 years in practice) |
| Group practice | Urgent Care Specialists Pc — 11 clinicians |
| Accepts Medicare assignment | Yes — accepts the Medicare-approved amount |
Other providers in Holden
-
Dr. Allison Nourielle Darvish, DO
10 Lexington Cir, Holden, MA 01520-1404 · (774) 239-8503
-
Dr. Richard Julien Freniere, DO
5 Shrewsbury St Ste D, Holden, MA 01520 · (508) 829-3800
-
Dr. Donald P Jackel, DO
5 Shrewsbury St Ste D, Holden, MA 01520 · (508) 829-3800
-
Rock H. Jean-Guillaume, DO
5 Shrewsbury St Ste D, Holden, MA 01520 · (508) 829-3800
-
Dr. Peter W Rugg, MD
5 Shrewsbury St Ste D, Holden, MA 01520 · (508) 829-3800
-
Urgent Care Specialists PC
5 Shrewsbury St Ste D, Holden, MA 01520-1960 · (508) 829-3800
-
Urgent Care Specialists PC
5 Shrewsbury St Ste D, Holden, MA 01520-1960 · (508) 829-3800