William Sun, - Medicare Internal Medicine in Fresno, CA

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William Sun, is a medicare enrolled "Internal Medicine" physician in Fresno, California. He graduated from medical school in 2018 and has 6 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Hospital Medicine Of California Inc and his current practice location is 155 N Fresno St, Fresno, California. You can reach out to his office (for appointments etc.) via phone at (559) 499-6500.

William Sun is licensed to practice in California (license number A174650) 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 1649777616.

Contact Information

William Sun,
155 N Fresno St,
Fresno, CA 93701-2302
(559) 499-6500
Not Available

Map and Direction




Physician's Profile

Full NameWilliam Sun
GenderMale
SpecialityInternal Medicine
Experience6 Years
Location155 N Fresno St, Fresno, 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:
  • William Sun graduated from medical school in 2018
  NPI Data:
  • NPI Number: 1649777616
  • Provider Enumeration Date: 04/06/2018
  • Last Update Date: 02/02/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 1355728841
  • Enrollment ID: I20220523002527

Medical Identifiers

Medical identifiers for William Sun such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1649777616NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine A174650 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Twin Cities Community HospitalTempleton, CAHospital
Santa Clara Valley Medical CenterSan jose, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Hospital Medicine Of California Inc468895290650

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. William Sun allows following entities to bill medicare on his behalf.
Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1659450955
PECOS PAC ID: 1254244973
Enrollment ID: O20040113000757
Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1699885079
PECOS PAC ID: 1254244973
Enrollment ID: O20040113000784
Entity NameSuperior Hospitalist Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1780047712
PECOS PAC ID: 1456650928
Enrollment ID: O20160504002343
Entity NameHospital Medicine Of California Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1770037236
PECOS PAC ID: 4688952906
Enrollment ID: O20161020001556

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. William Sun 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
William Sun,
155 N Fresno St,
Fresno, CA 93701-2302

Ph: () -		William Sun,
155 N Fresno St,
Fresno, CA 93701-2302

Ph: (559) 499-6500

Reviews and Comments


Internal Medicine Doctors in Fresno, CA

Maulik Shah, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 7300 N Fresno St, Fresno, CA 93720
Phone: 559-448-4555    
Dr. John R Nelson, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 7061 N Whitney, Suite 101, Fresno, CA 93720
Phone: 559-299-0224    Fax: 559-299-4201
Dexter T Estrada, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 7130 N Millbrook Ave Ste 100, Fresno, CA 93720
Phone: 559-326-1222    Fax: 559-326-1230
Dr. Sherry Lopez, D.O.
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 3209 W Shaw Ave, Suite 114, Fresno, CA 93711
Phone: 559-224-4977    Fax: 559-224-4980
Maria Flordeliz Arambulo, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2823 Fresno St, Fresno, CA 93721
Phone: 559-499-6484    Fax: 559-499-6501
Shreela Mishra,
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 7085 N Chestnut Ave Ste 101, Fresno, CA 93720
Phone: 559-323-9236    Fax: 559-323-0294
Dr. Mona Aziz Zia, M.D.
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 2615 E Clinton Ave, Fresno, CA 93703
Phone: 559-301-8545    

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.