Dr John Frederick Shield, MD - Medicare Internal Medicine in Sonora, CA

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Dr John Frederick Shield, MD is a medicare enrolled "Internal Medicine" physician in Sonora, California. He graduated from medical school in 1980 and has 46 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Union Associated Physicians Clinic, Llc, Valley Professionals Community Health Center Inc, Valley Professionals Community Health Center Inc and his current practice location is 690 Guzzi Ln, Suite A, Sonora, California. You can reach out to his office (for appointments etc.) via phone at (209) 536-5070.

Dr John Frederick Shield is licensed to practice in California (license number G45205) 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 1033189634.

Contact Information

Dr John Frederick Shield, MD
690 Guzzi Ln, Suite A,
Sonora, CA 95370-5289
(209) 536-5070
Not Available

Map and Direction




Physician's Profile

Full NameDr John Frederick Shield
GenderMale
SpecialityInternal Medicine
Experience46 Years
Location690 Guzzi Ln, Sonora, 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 John Frederick Shield graduated from medical school in 1980
  NPI Data:
  • NPI Number: 1033189634
  • Provider Enumeration Date: 01/25/2006
  • Last Update Date: 06/24/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 7911078563
  • Enrollment ID: I20250915000386

Medical Identifiers

Medical identifiers for Dr John Frederick Shield such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1033189634NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine G45205 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Union Hospital IncTerre haute, INHospital
Adventist Health SonoraSonora, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Union Associated Physicians Clinic, Llc3375687437230
Valley Professionals Community Health Center Inc761806726571
Valley Professionals Community Health Center Inc761806726571

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 John Frederick Shield allows following entities to bill medicare on his behalf.
Entity NameValley Professionals Community Health Center Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1104006253
PECOS PAC ID: 7618067265
Enrollment ID: O20071219000487
Entity NameUnion Associated Physicians Clinic, LLC
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1891028379
PECOS PAC ID: 3375687437
Enrollment ID: O20100213000002

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 John Frederick Shield 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 John Frederick Shield, MD
690 Guzzi Ln Ste A,
Sonora, CA 95370-5292

Ph: (209) 536-5070		Dr John Frederick Shield, MD
690 Guzzi Ln, Suite A,
Sonora, CA 95370-5289

Ph: (209) 536-5070

Reviews and Comments


Internal Medicine Doctors in Sonora, CA

Dr. Kevin Gandhi, DO
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Practice Location: 1000 Greenley Rd, Sonora, CA 95370
Phone: 209-536-5000    
Jiandong Wei, MD
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Practice Location: 1000 Greenley Rd, Sonora, CA 95370
Phone: 209-536-5000    
Andreas Wolf, MD
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Practice Location: 900 Greenley Rd Ste 911, Sonora, CA 95370
Phone: 209-536-3249    
Dr. Kyi Kyi Thwin Win, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 690 Guzzi Lane, Ste D, Sonora, CA 95370
Phone: 909-337-0059    Fax: 909-337-3499
Dr. David Eugene Allen, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 690 Guzzi Lane, Suite D, Sonora, CA 95370
Phone: 209-533-0333    
Dr. Johnson Kar Tsun Wong, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 14568a Mono Way, Sonora, CA 95370
Phone: 209-768-1217    Fax: 209-533-2061
Reiker Joseph Schultz, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 690 Guzzi Ln Ste B, Sonora, CA 95370
Phone: 209-536-5060    Fax: 209-588-9743

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.