William Charles O'callahan Jr, MD in Holden, MA

William Charles O'callahan Jr, MD is a medicare enrolled "Emergency Medicine" physician in Holden, Massachusetts. He went to University Of Massachusetts Medical School and graduated in 1990 and has 36 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Urgent Care Specialists Pc and his current practice location is 5 Shrewsbury St Ste D, Holden, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (508) 829-3800.

William Charles O'callahan Jr is licensed to practice in Massachusetts (license number 79001) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1114964186.

Contact Information

	William Charles O'callahan Jr, MD
	5 Shrewsbury St Ste D, Holden, MA 01520-1960
	(508) 829-3800
	(508) 829-3802

Map and Direction

Physician's Profile

Full Name	William Charles O'callahan Jr
Gender	Male
Speciality	Emergency Medicine
Experience	36 Years
Location	5 Shrewsbury St Ste D, Holden, Massachusetts
Accepts Medicare Assignments	Yes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.

Medical Education and Training:

William Charles O'callahan Jr attended and graduated from University Of Massachusetts Medical School in 1990

NPI Data:

NPI Number: 1114964186
Provider Enumeration Date: 05/31/2006
Last Update Date: 01/21/2025

Medicare PECOS Information:

PECOS PAC ID: 3072692805
Enrollment ID: I20080506000317

Medical Identifiers

Medical identifiers for William Charles O'callahan Jr such as npi, medicare ID, medicare PIN, medicaid, etc.

Identifier	Type	State	Issuer
1114964186	NPI	-	NPPES

Medical Taxonomies and Licenses

Taxonomy	Type	License (State)	Status
207P00000X	Emergency Medicine	79001 (Massachusetts)	Primary

Medical Facilities Affiliation

Facility Name	Location	Facility Type
Umass Memorial Medical Center/university Campus	Worcester, MA	Hospital

Group Practice Association

Group Practice Name	Group PECOS PAC ID	No. of Members
Urgent Care Specialists Pc	7315198488	11

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. William Charles O'callahan Jr allows following entities to bill medicare on his behalf.

Entity Name	Urgent Care Specialists, P.c.
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1902157746 PECOS PAC ID: 7315198488 Enrollment ID: O20121119000614

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. William Charles O'callahan Jr is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing Address	Practice Location Address
William Charles O'callahan Jr, MD 5 Shrewsbury St Ste D, Holden, MA 01520-1960 Ph: (508) 829-3800	William Charles O'callahan Jr, MD 5 Shrewsbury St Ste D, Holden, MA 01520-1960 Ph: (508) 829-3800

Reviews and Comments

Emergency Medicine Doctors in Holden, MA

Dr. Richard Julien Freniere, DO Emergency Medicine Medicare: Not Enrolled in Medicare Practice Location: 5 Shrewsbury St Ste D, Holden, MA 01520 Phone: 508-829-3800 Fax: 508-829-3802
Dr. Donald P Jackel, DO Emergency Medicine Medicare: Medicare Enrolled Practice Location: 5 Shrewsbury St Ste D, Holden, MA 01520 Phone: 508-829-3800 Fax: 508-829-3802
Dr. Peter W Rugg, MD Emergency Medicine Medicare: Not Enrolled in Medicare Practice Location: 5 Shrewsbury St Ste D, Holden, MA 01520 Phone: 508-829-3800 Fax: 508-829-3802
Dr. Allison Nourielle Darvish, DO Emergency Medicine Medicare: Accepting Medicare Assignments Practice Location: 10 Lexington Cir, Holden, MA 01520 Phone: 774-239-8503
Rock H. Jean-guillaume, D.O. Emergency Medicine Medicare: Accepting Medicare Assignments Practice Location: 5 Shrewsbury St Ste D, Holden, MA 01520 Phone: 508-829-3800 Fax: 508-829-3802

William Charles O'callahan Jr, MD - Medicare Emergency Medicine in Holden, MA