Dr Sean S To, MD - Medicare Internal Medicine in Chino, CA

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Dr Sean S To, MD is a medicare enrolled "Internal Medicine" physician in Chino, California. He went to R Franklin University Of Med & Sci/chicago Medical School and graduated in 1998 and has 26 years of diverse experience with area of expertise as Internal Medicine. His current practice location is 5562 Philadelphia St Ste 201, Chino, California. You can reach out to his office (for appointments etc.) via phone at (909) 988-1000.

Dr Sean S To is licensed to practice in California (license number A75204) 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 1922163310.

Contact Information

Dr Sean S To, MD
5562 Philadelphia St Ste 201,
Chino, CA 91710-2482
(909) 988-1000
(909) 988-1001

Map and Direction




Physician's Profile

Full NameDr Sean S To
GenderMale
SpecialityInternal Medicine
Experience26 Years
Location5562 Philadelphia St Ste 201, Chino, California
Accepts Medicare AssignmentsYes. 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 Sean S To attended and graduated from R Franklin University Of Med & Sci/chicago Medical School in 1998
  NPI Data:
  • NPI Number: 1922163310
  • Provider Enumeration Date: 12/26/2006
  • Last Update Date: 08/08/2020
  Medicare PECOS Information:
  • PECOS PAC ID: 1850313578
  • Enrollment ID: I20051222000171

Medical Identifiers

Medical identifiers for Dr Sean S To such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1922163310NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine A75204 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
San Antonio Regional HospitalUpland, CAHospital
Pomona Valley Hospital Medical CenterPomona, CAHospital

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 Sean S To allows following entities to bill medicare on his behalf.
Entity NameSean S To Md Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1841809597
PECOS PAC ID: 2860414588
Enrollment ID: O20051222000120
Entity NameGrove Internal Medicine Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1811224298
PECOS PAC ID: 0143364083
Enrollment ID: O20100216000732

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 Sean S To 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 AddressPractice Location Address
Dr Sean S To, MD
1317 S Diamond Bar Blvd Unit 4462,
Diamond Bar, CA 91765-5620

Ph: (909) 988-0000		Dr Sean S To, MD
5562 Philadelphia St Ste 201,
Chino, CA 91710-2482

Ph: (909) 988-1000

Reviews and Comments


Internal Medicine Doctors in Chino, CA

Dr. Tuan Hoang, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 14901 Central Ave, Chino, CA 91710
Phone: 909-597-1821    
Dr. Karin C Li, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 13768 Roswell Ave Ste 215, Chino, CA 91710
Phone: 909-325-2215    Fax: 888-491-0615
Dr. Avani Manilal Patel, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 5475 Walnut Ave, Chino, CA 91710
Phone: 909-591-6446    Fax: 909-591-1309
Dr. Jonathan Doo Sung Cho, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 14901 Central Ave, Chino, CA 91710
Phone: 909-597-1821    
Dr. Gary T. Lai, M.D.
Internal Medicine
Medicare: May Accept Medicare Assignments
Practice Location: 14335 Pipeline Ave, Chino, CA 91710
Phone: 909-548-3888    Fax: 909-548-3999
Dr. Robert Alphus Clinton, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 14901 Central Ave, Chino, CA 91710
Phone: 909-597-1821    
Dr. Ali M. Etemadian, D.O.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 5343 Riverside Dr, Chino, CA 91710
Phone: 909-591-6227    Fax: 909-591-6319

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.