Ashish Atreja, MD in Stanford, CA - Medicare Gastroenterology

Ashish Atreja, MD is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Stanford, California. He graduated from medical school in 1999 and has 27 years of diverse experience with area of expertise as Gastroenterology. He is a member of the group practice Regents Of The Univ Of Ca and his current practice location is 300 Pasteur Dr, Stanford, California. You can reach out to his office (for appointments etc.) via phone at (650) 723-4000.

Ashish Atreja is licensed to practice in California (license number C184563) 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 1831152883.

Contact Information

	Ashish Atreja, MD
	300 Pasteur Dr, Stanford, CA 94305-2200
	(650) 723-4000
	Not Available

Map and Direction

Physician's Profile

Full Name	Ashish Atreja
Gender	Male
Speciality	Gastroenterology
Experience	27 Years
Location	300 Pasteur Dr, Stanford, 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:

Ashish Atreja graduated from medical school in 1999

NPI Data:

NPI Number: 1831152883
Provider Enumeration Date: 04/10/2006
Last Update Date: 01/22/2026

Medicare PECOS Information:

PECOS PAC ID: 6901873793
Enrollment ID: I20241106003370

Medical Identifiers

Medical identifiers for Ashish Atreja such as npi, medicare ID, medicare PIN, medicaid, etc.

Identifier	Type	State	Issuer
1831152883	NPI	-	NPPES

Medical Taxonomies and Licenses

Taxonomy	Type	License (State)	Status
207R00000X	Internal Medicine	35082919 (Ohio)	Secondary
207RG0100X	Internal Medicine - Gastroenterology	265164 (New York)	Secondary
207RG0100X	Internal Medicine - Gastroenterology	C184563 (California)	Primary
207R00000X	Internal Medicine	C184563 (California)	Secondary

Medical Facilities Affiliation

Facility Name	Location	Facility Type
University Of California Davis Medical Center	Sacramento, CA	Hospital

Group Practice Association

Group Practice Name	Group PECOS PAC ID	No. of Members
Regents Of The Univ Of Ca	3375456619	1468

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. Ashish Atreja allows following entities to bill medicare on his behalf.

Entity Name	Regents Of The Univ Of Ca
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1013906973 PECOS PAC ID: 3375456619 Enrollment ID: O20031111000892

Entity Name	Regents Of The University Of California
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1952998973 PECOS PAC ID: 8022922475 Enrollment ID: O20031118001149

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. Ashish Atreja 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
Ashish Atreja, MD 300 Pasteur Dr, Stanford, CA 94305-2200 Ph: (650) 723-4000	Ashish Atreja, MD 300 Pasteur Dr, Stanford, CA 94305-2200 Ph: (650) 723-4000

Reviews and Comments

Internal Medicine Doctors in Stanford, CA

Prista Charuworn, MD Gastroenterology Medicare: Not Enrolled in Medicare Practice Location: 300 Pasteur Dr, Alway Build M211, Mc 5187, Stanford, CA 94305 Phone: 650-723-6661
Yu Kuang Lai, MD Gastroenterology Medicare: Accepting Medicare Assignments Practice Location: 300 Pasteur Dr, Stanford, CA 94305 Phone: 650-723-4000
Andrea Lorenze, M.D. Gastroenterology Medicare: Accepting Medicare Assignments Practice Location: 300 Pasteur Drive, Lane 154, Stanford, CA 94305 Phone: 650-723-6661 Fax: 650-498-6205
Audra Horomanski, MD Gastroenterology Medicare: Accepting Medicare Assignments Practice Location: 300 Pasteur Dr, Stanford, CA 94305 Phone: 650-723-4000 Fax: 650-498-6205
Meghan Brady Marmor, MD Gastroenterology Medicare: Accepting Medicare Assignments Practice Location: 300 Pasteur Dr, Stanford, CA 94305 Phone: 650-723-4000
Lauren Michelle Ulsh, MD Gastroenterology Medicare: Accepting Medicare Assignments Practice Location: 300 Pasteur Dr, Stanford, CA 94305 Phone: 650-723-4000
Savannah Karmen-tuohy, MD Gastroenterology Medicare: Medicare Enrolled Practice Location: 300 Pasteur Dr, Stanford, CA 94305 Phone: 650-723-4000

Ashish Atreja, MD - Medicare Gastroenterology in Stanford, CA