William A Sia, NP-C - Medicare Nurse Practitioner in Upland, CA

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William A Sia, NP-C is a medicare enrolled "Nurse Practitioner - Family" in Upland, California. His current practice location is 1382 E Foothill Blvd, Upland, California. You can reach out to his office (for appointments etc.) via phone at (909) 982-6500.

William A Sia is licensed to practice in California (license number F03180293) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1679063945.

Contact Information

William A Sia, NP-C
1382 E Foothill Blvd,
Upland, CA 91786-4014
(909) 982-6500
(909) 920-0406

Map and Direction




Provider's Profile

Full NameWilliam A Sia
GenderMale
SpecialityNurse Practitioner - Family
Location1382 E Foothill Blvd, Upland, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1679063945
  • Provider Enumeration Date: 05/13/2018
  • Last Update Date: 09/12/2019
  Medicare PECOS Information:
  • PECOS PAC ID: 8022354539
  • Enrollment ID: I20190103002723

Medical Identifiers

Medical identifiers for William A Sia such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1679063945NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
363LF0000XNurse Practitioner - Family F03180293 (California)Primary

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 A Sia allows following entities to bill medicare on his behalf.
Entity NameClinica Medica Dr Juan Escobar Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1942444286
PECOS PAC ID: 8527119189
Enrollment ID: O20090623000161
Entity NameHollywood Presbyterian Emergency Medical Associates, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1972826931
PECOS PAC ID: 7618006263
Enrollment ID: O20100520000454
Entity NameBeverly Community Clinic
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1144791500
PECOS PAC ID: 7810301926
Enrollment ID: O20210202000693

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 A Sia 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 A Sia, NP-C
1365 Wickham Ct,
San Dimas, CA 91773-3862

Ph: (626) 261-3175		William A Sia, NP-C
1382 E Foothill Blvd,
Upland, CA 91786-4014

Ph: (909) 982-6500

Reviews and Comments


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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.