Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. John Frederick Shield, MD

Individual provider Internal Medicine Physician · NPI 1033189634

Dr. John Frederick Shield, MD is an Internal Medicine in Sonora, California. Qualified in 1980, 46 years ago. Practices with Union Associated Physicians Clinic, LLC, a 231-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
46
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

690 Guzzi Ln Ste A
Sonora, CA 95370-5289
Phone: (209) 536-5070
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence G45205 (CA)

Record details

NPI number1033189634
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 25, 2006
Last updated in NPPESJune 24, 2024
Certification dateJune 24, 2024
Mailing address690 Guzzi Ln Ste A, Sonora, CA 95370-5292

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1980 (46 years in practice)
Group practice Union Associated Physicians Clinic, Llc — 231 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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