Dr Karthikeyan Viswanathan, DO in Los Altos, CA

Dr Karthikeyan Viswanathan, DO is a medicare enrolled "Internal Medicine" physician in Los Altos, California. He graduated from medical school in 2014 and has 11 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Redwoods Rural Health Center Inc, Redwoods Rural Health Center Inc and his current practice location is 4546 El Camino Real Ste B7, Los Altos, California. You can reach out to his office (for appointments etc.) via phone at (866) 362-4246.

Dr Karthikeyan Viswanathan is licensed to practice in California (license number 20A19044) and he also participates in the medicare program. He may accept medicare assignments (which means he may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance) and his NPI Number is 1396128336.

Contact Information

	Dr Karthikeyan Viswanathan, DO
	4546 El Camino Real Ste B7, Los Altos, CA 94022-1069
	(866) 362-4246
	(650) 260-6030

Map and Direction

Physician's Profile

Full Name	Dr Karthikeyan Viswanathan
Gender	Male
Speciality	Internal Medicine
Experience	11 Years
Location	4546 El Camino Real Ste B7, Los Altos, California
Accepts Medicare Assignments	May be. He may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance.

Medical Education and Training:

Dr Karthikeyan Viswanathan graduated from medical school in 2014

NPI Data:

NPI Number: 1396128336
Provider Enumeration Date: 07/08/2015
Last Update Date: 08/21/2025

Medicare PECOS Information:

PECOS PAC ID: 6103251442
Enrollment ID: I20230123001402

Medical Identifiers

Medical identifiers for Dr Karthikeyan Viswanathan such as npi, medicare ID, medicare PIN, medicaid, etc.

Identifier	Type	State	Issuer
1396128336	NPI	-	NPPES

Medical Taxonomies and Licenses

Taxonomy	Type	License (State)	Status
207R00000X	Internal Medicine	20A19044 (California)	Primary

Medical Facilities Affiliation

Facility Name	Location	Facility Type
Jerold Phelps Community Hospital	Garberville, CA	Hospital

Group Practice Association

Group Practice Name	Group PECOS PAC ID	No. of Members
Redwoods Rural Health Center Inc	6709867583	10
Redwoods Rural Health Center Inc	6709867583	10

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 Karthikeyan Viswanathan allows following entities to bill medicare on his behalf.

Entity Name	United Indian Health Services, Inc.
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1497751572 PECOS PAC ID: 9830085075 Enrollment ID: O20040225000459

Entity Name	Southern Humboldt Community Healthcare District
Entity Type	Part B Supplier - Clinic/group Practice
Entity Identifiers	NPI Number: 1003819376 PECOS PAC ID: 8820982879 Enrollment ID: O20100106000632

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 Karthikeyan Viswanathan 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 Karthikeyan Viswanathan, DO 4546 El Camino Real Ste B7, Los Altos, CA 94022-1069 Ph: (866) 362-4246	Dr Karthikeyan Viswanathan, DO 4546 El Camino Real Ste B7, Los Altos, CA 94022-1069 Ph: (866) 362-4246

Reviews and Comments

Internal Medicine Doctors in Los Altos, CA

Dr. Simon Anthony Humphries, MD Internal Medicine Medicare: May Accept Medicare Assignments Practice Location: 811 Altos Oaks Dr, Suite 2, Los Altos, CA 94024 Phone: 650-917-6920 Fax: 650-917-6925
Paul Tang, M.D. Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 370 Distel Circle, Los Altos, CA 94022 Phone: 650-254-5200
Gina Serraiocco, MD Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 370 Distel Cir, Los Altos, CA 94022 Phone: 650-254-5200
Charles Tuchinda, M.D. Internal Medicine Medicare: Not Enrolled in Medicare Practice Location: 1965 Laver Ct, Los Altos, CA 94024 Phone: 617-930-6428
Lailey Naomi Oliva, MD Internal Medicine Medicare: Accepting Medicare Assignments Practice Location: 370 Distel Cir, Los Altos, CA 94022 Phone: 650-254-5200
Ronda Macchello, MD Internal Medicine Medicare: Not Enrolled in Medicare Practice Location: 370 Disel Cir, Los Altos, CA 95022 Phone: 650-254-5200
Amy Muzaffar, MD Internal Medicine Medicare: Medicare Enrolled Practice Location: 370 Distel Cir, Los Altos, CA 94022 Phone: 650-254-5200

Dr Karthikeyan Viswanathan, DO - Medicare Internal Medicine in Los Altos, CA