Dr. John Frederick Shield, MD
Dr. John Frederick Shield is a Internal Medicine Physician provider (Internal Medicine) practicing in Sonora, CA, registered in the NPPES registry with NPI 1033189634 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1033189634 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. John Frederick Shield |
| Credential | MD |
| Sex | Male |
| Practice address | 690 GUZZI LN, SUITE A, Sonora, CA, 95370 |
| Phone | 2095365070 |
| Enumeration date | 2006-01-25 |
| Last updated in NPPES | 2024-06-24 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | Primary | G45205 | CA |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: John Shield, MD NPI: 1033189634 Taxonomy: 207R00000X (Internal Medicine Physician) Address: 690 GUZZI LN, SUITE A, Sonora, CA, 95370
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1407842339 | Adult Medicine Specialists, Inc | Organization | Internal Medicine Physician | Sonora, CA |
| 1659362614 | Sonora Community Hospital | Organization | Internal Medicine Physician | Sonora, CA |
| 1588641351 | Nickolas Dobler | Individual | Physician Assistant | Sonora, CA |
| 1720042732 | Daniel Phillips | Individual | Internal Medicine Physician | Sonora, CA |
| 1871698241 | Carolee Ross | Individual | Adult Health Nurse Practitioner | Sonora, CA |
| 1720172455 | Claire Mills | Individual | Women's Health Nurse Practitioner | Sonora, CA |
| 1215255062 | Jacey Rodriguez-Serva | Individual | Family Nurse Practitioner | Sonora, CA |
Verify this record
Cross-check NPI 1033189634 against the authoritative CMS record: view Dr. John Frederick Shield on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2024-06-24.