Dr Matthew Craig Williams, MD in Mill Valley, CA

Dr Matthew Craig Williams, MD is a medicare enrolled "Psychiatry & Neurology - Child & Adolescent Psychiatry" physician in Mill Valley, California. He went to Georgetown University School Of Medicine and graduated in 2021 and has 5 years of diverse experience with area of expertise as Psychiatry. He is a member of the group practice Bay Psychiatric Associates and his current practice location is 655 Redwood Hwy Frontage Rd Ste 261, Mill Valley, California. You can reach out to his office (for appointments etc.) via phone at (415) 381-1690.

Dr Matthew Craig Williams is licensed to practice in California (license number A186478) 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 1326626797.

Contact Information

	Dr Matthew Craig Williams, MD
	655 Redwood Hwy Frontage Rd Ste 261, Mill Valley, CA 94941-3011
	(415) 381-1690
	Not Available

Map and Direction

Physician's Profile

Full Name	Dr Matthew Craig Williams
Gender	Male
Speciality	Psychiatry
Experience	5 Years
Location	655 Redwood Hwy Frontage Rd Ste 261, Mill Valley, California
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:

Dr Matthew Craig Williams attended and graduated from Georgetown University School Of Medicine in 2021

NPI Data:

NPI Number: 1326626797
Provider Enumeration Date: 03/29/2021
Last Update Date: 06/09/2026

Medicare PECOS Information:

PECOS PAC ID: 6709259203
Enrollment ID: I20231109003422

Medical Identifiers

Medical identifiers for Dr Matthew Craig Williams such as npi, medicare ID, medicare PIN, medicaid, etc.

Identifier	Type	State	Issuer
1326626797	NPI	-	NPPES

Medical Taxonomies and Licenses

Taxonomy	Type	License (State)	Status
2084P0804X	Psychiatry & Neurology - Child & Adolescent Psychiatry	A186478 (California)	Primary
2084P0800X	Psychiatry & Neurology - Psychiatry	A186478 (California)	Secondary

Group Practice Association

Group Practice Name	Group PECOS PAC ID	No. of Members
Bay Psychiatric Associates	6204723331	59

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. Dr Matthew Craig Williams allows following entities to bill medicare on his behalf.

Entity Name	Bay Psychiatric Associates
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1427163229 PECOS PAC ID: 6204723331 Enrollment ID: O20040302001403

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. Dr Matthew Craig 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
Dr Matthew Craig Williams, MD 655 Redwood Hwy Frontage Rd Ste 261, Mill Valley, CA 94941-3011 Ph: (415) 381-1690	Dr Matthew Craig Williams, MD 655 Redwood Hwy Frontage Rd Ste 261, Mill Valley, CA 94941-3011 Ph: (415) 381-1690

Reviews and Comments

Psychiatry & Neurology Doctors in Mill Valley, CA

Dr. Daryn Michele Sperling, M.D. Psychiatry & Neurology Medicare: Not Enrolled in Medicare Practice Location: 34 Forrest St, Mill Valley, CA 94941 Phone: 415-924-1787
Richard Adam Goldwasser, MD Psychiatry & Neurology Medicare: Accepting Medicare Assignments Practice Location: 655 Redwood Highway, #261, Mill Valley, CA 94941 Phone: 415-381-1690 Fax: 415-381-1699
Dr. Brigitte Anneliese Apfel, M.D. Psychiatry & Neurology Medicare: Medicare Enrolled Practice Location: 311 Miller Ave, Suite M, Mill Valley, CA 94941 Phone: 415-968-5859 Fax: 415-413-0397
Dr. Sandra L Shefrin, M.D. Psychiatry & Neurology Medicare: Accepting Medicare Assignments Practice Location: 279 Miller Ave, Mill Valley, CA 94941 Phone: 415-380-1950 Fax: 415-388-5742
Dr. Adam Phillip Nelson, M.D. Psychiatry & Neurology Medicare: Not Enrolled in Medicare Practice Location: 45 Camino Alto, Suite 200, Mill Valley, CA 94941 Phone: 415-460-6710 Fax: 415-460-6710
Dr. Mark Swoiskin, M.D. Psychiatry & Neurology Medicare: Not Enrolled in Medicare Practice Location: 655 Redwood Hwy Ste 255, Mill Valley, CA 94941 Phone: 415-384-0612
Dr. Elliott Martin Stein, M.D. Psychiatry & Neurology Medicare: Accepting Medicare Assignments Practice Location: 535 Midvale Way, Mill Valley, CA 94941 Phone: 156-729-3524

Dr Matthew Craig Williams, MD - Medicare Psychiatry in Mill Valley, CA