Michael Gregory Williams, MD in Southfield, MI

Michael Gregory Williams, MD is a medicare enrolled "General Practice" physician in Southfield, Michigan. He went to University Of Michigan Medical School and graduated in 1984 and has 42 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Theoria Medical and his current practice location is 20411 W 12 Mile Rd Ste 102, Southfield, Michigan. You can reach out to his office (for appointments etc.) via phone at (248) 905-3194.

Michael Gregory Williams is licensed to practice in Michigan (license number 4301049187) 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 1578561304.

Contact Information

	Michael Gregory Williams, MD
	20411 W 12 Mile Rd Ste 102, Southfield, MI 48076-6404
	(248) 905-3194
	(248) 905-3548

Map and Direction

Physician's Profile

Full Name	Michael Gregory Williams
Gender	Male
Speciality	Emergency Medicine
Experience	42 Years
Location	20411 W 12 Mile Rd Ste 102, Southfield, Michigan
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:

Michael Gregory Williams attended and graduated from University Of Michigan Medical School in 1984

NPI Data:

NPI Number: 1578561304
Provider Enumeration Date: 07/14/2005
Last Update Date: 01/18/2026

Medicare PECOS Information:

PECOS PAC ID: 3274429303
Enrollment ID: I20040225001026

Medical Identifiers

Medical identifiers for Michael Gregory Williams such as npi, medicare ID, medicare PIN, medicaid, etc.

Identifier	Type	State	Issuer
1578561304	NPI	-	NPPES
P00943709	Other	MI	RAILROAD MEDICARE IND PIN
1578561304	Medicaid	MI
0108118302	Other	MI	BCBS IND

Medical Taxonomies and Licenses

Taxonomy	Type	License (State)	Status
207P00000X	Emergency Medicine	MW049187 (Michigan)	Secondary
208D00000X	General Practice	4301049187 (Michigan)	Primary

Medical Facilities Affiliation

Facility Name	Location	Facility Type
Pilgrim Manor	Grand rapids, MI	Nursing home

Group Practice Association

Group Practice Name	Group PECOS PAC ID	No. of Members
Theoria Medical	5395098339	414

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. Michael Gregory Williams allows following entities to bill medicare on his behalf.

Entity Name	Theoria Medical
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1609362375 PECOS PAC ID: 5395098339 Enrollment ID: O20181004002127

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. Michael Gregory Williams 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
Michael Gregory Williams, MD 20411 W 12 Mile Rd Ste 102, Southfield, MI 48076-6404 Ph: (248) 905-3194	Michael Gregory Williams, MD 20411 W 12 Mile Rd Ste 102, Southfield, MI 48076-6404 Ph: (248) 905-3194

Reviews and Comments

General Practice Doctors in Southfield, MI

Mr. Vicha Janviriya, MD General Practice Medicare: Not Enrolled in Medicare Practice Location: 20905 Greenfield Rd, Suite 603m, Southfield, MI 48075 Phone: 248-268-4464 Fax: 248-268-4465
Dr. Elizer Garcia, M.D. General Practice Medicare: Not Enrolled in Medicare Practice Location: 23999 Northwestern Hwy Ste 114, Southfield, MI 48075 Phone: 248-278-8937
Ardeshir E Said, MD General Practice Medicare: Medicare Enrolled Practice Location: 21700 Northwestern Hwy, Suite 801, Southfield, MI 48075 Phone: 248-440-0920 Fax: 248-440-0929
Derrick Williamson, DO General Practice Medicare: Accepting Medicare Assignments Practice Location: 20755 Greenfield Rd Ste 100, Southfield, MI 48075 Phone: 947-282-5009 Fax: 248-809-2319
Dr. Rebecca Kathleene Motley, M.D. General Practice Medicare: Accepting Medicare Assignments Practice Location: 20245 W 12 Mile Rd Ste 120, Southfield, MI 48076 Phone: 248-552-1327 Fax: 248-552-1183
Ms. Esther Arhin-, General Practice Medicare: Not Enrolled in Medicare Practice Location: 28475 Greenfield Rd, Suite 119, Southfield, MI 48076 Phone: 248-327-7966
Daphine Ann Brown, M.D. General Practice Medicare: Medicare Enrolled Practice Location: 20905 Greenfield Rd, Suite 306, Southfield, MI 48075 Phone: 248-569-9641 Fax: 248-569-9643

Michael Gregory Williams, MD - Medicare Emergency Medicine in Southfield, MI