Mercedes Tomioka, MD in Irvine, CA - Medicare Internal Medicine

Mercedes Tomioka, MD is a medicare enrolled "Internal Medicine - Geriatric Medicine" physician in Irvine, California. She graduated from medical school in 1996 and has 29 years of diverse experience with area of expertise as Internal Medicine. She is a member of the group practice Hoag Clinic and her current practice location is 16300 Sand Canyon Ave Ste 311, Irvine, California. You can reach out to her office (for appointments etc.) via phone at (949) 791-3101.

Mercedes Tomioka is licensed to practice in California (license number A79604) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1275639262.

Contact Information

	Mercedes Tomioka, MD
	16300 Sand Canyon Ave Ste 311, Irvine, CA 92618-3703
	(949) 791-3101
	Not Available

Map and Direction

Physician's Profile

Full Name	Mercedes Tomioka
Gender	Female
Speciality	Internal Medicine
Experience	29 Years
Location	16300 Sand Canyon Ave Ste 311, Irvine, California
Accepts Medicare Assignments	Yes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.

Medical Education and Training:

Mercedes Tomioka graduated from medical school in 1996

NPI Data:

NPI Number: 1275639262
Provider Enumeration Date: 09/16/2006
Last Update Date: 12/07/2025

Medicare PECOS Information:

PECOS PAC ID: 8123920964
Enrollment ID: I20040122001000

Medical Identifiers

Medical identifiers for Mercedes Tomioka such as npi, medicare ID, medicare PIN, medicaid, etc.

Identifier	Type	State	Issuer
1275639262	NPI	-	NPPES

Medical Taxonomies and Licenses

Taxonomy	Type	License (State)	Status
207RG0300X	Internal Medicine - Geriatric Medicine	A79604 (California)	Primary

Medical Facilities Affiliation

Facility Name	Location	Facility Type
Companion Home Health	Orange, CA	Home health agency
Hoag Memorial Hospital Presbyterian	Newport beach, CA	Hospital

Group Practice Association

Group Practice Name	Group PECOS PAC ID	No. of Members
Hoag Clinic	3274872064	347

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. Mercedes Tomioka allows following entities to bill medicare on her behalf.

Entity Name	Providence Medical Foundation
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1285890624 PECOS PAC ID: 8921993205 Enrollment ID: O20040216001346

Entity Name	Hoag Clinic
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1942799523 PECOS PAC ID: 3274872064 Enrollment ID: O20190221001936

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. Mercedes Tomioka 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
Mercedes Tomioka, MD 16300 Sand Canyon Ave Ste 311, Irvine, CA 92618-3703 Ph: () -	Mercedes Tomioka, MD 16300 Sand Canyon Ave Ste 311, Irvine, CA 92618-3703 Ph: (949) 791-3101

Reviews and Comments

Internal Medicine Doctors in Irvine, CA

Akbar Nassiry, M.D., M.P.H. Geriatric Medicine Medicare: Accepting Medicare Assignments Practice Location: 4000 Barranca Parkway, Ste. 250, Irvine, CA 92604 Phone: 949-577-0047 Fax: 909-635-6085
Omid Vesal, M.D. Geriatric Medicine Medicare: Accepting Medicare Assignments Practice Location: 2500 Alton Parkway, Suite 101, Irvine, CA 92606 Phone: 949-222-2722 Fax: 949-222-9969
Dr. Maria Teresa Corpin Agner, MD Geriatric Medicine Medicare: Not Enrolled in Medicare Practice Location: 11 Technology Dr, Irvine, CA 92618 Phone: 855-206-6764 Fax: 949-923-3575
Dr. Susan Davoodifar, M.D. Geriatric Medicine Medicare: Not Enrolled in Medicare Practice Location: 4199 Campus Dr, Suite 550, Irvine, CA 92612 Phone: 949-509-6503 Fax: 949-326-0103
Randa Serag, M.D. Geriatric Medicine Medicare: Accepting Medicare Assignments Practice Location: 4708 Barranca Pkwy, Irvine, CA 92604 Phone: 949-791-3101 Fax: 949-791-3112
Tara E Seery, Geriatric Medicine Medicare: Accepting Medicare Assignments Practice Location: 16105 Sand Canyon Ave Ste 230, Irvine, CA 92618 Phone: 949-764-5347 Fax: 949-557-0221
Nadir Yusaf Qazi, DO Geriatric Medicine Medicare: Medicare Enrolled Practice Location: 113 Waterworks Way Ste 105, Irvine, CA 92618 Phone: 949-336-7293

Mercedes Tomioka, MD - Medicare Internal Medicine in Irvine, CA