John Shield, MD
NPI 1033189634 · Internal Medicine Physician · Sonora, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Shield, MD is a Internal Medicine Physician provider in Sonora, CA (NPI 1033189634).
Provider details
- NPI number
- 1033189634
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G45205 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
4,061 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 1,220 | $16 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,036 | $96 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 456 | $65 |
| Test to Examine How Well the Lungs Exchange Gases94729 | 387 | $9 |
| Test to Measure Expiratory Airflow and Volume Changes Before and After Medication Administration94060 | 376 | $10 |
| Test to Determine Lung Volumes Using Sensors |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 114 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 583 | 136 |
| Losartan Potassium | 456 | 118 |
| Valsartan | 455 | 114 |
| Atorvastatin Calcium | 436 | 114 |
| Levothyroxine Sodium | 355 | 79 |
| Omeprazole | 321 | 81 |
| Rosuvastatin Calcium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-25
- Last updated
- 2024-06-24
- Certified
- 2024-06-24
Frequently asked questions
- What is John Shield's NPI number?
- John Shield's National Provider Identifier (NPI) is 1033189634, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Shield's specialty?
- John Shield is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Shield located?
- John Shield's practice location on file with NPPES is 690 Guzzi Ln, Sonora, CA 95370-5289.
- What is John Shield's phone number?
- The practice phone number listed in the NPPES registry for John Shield is (209) 536-5070.
- Does John Shield accept Medicare?
- John Shield is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Shield's NPI active?
- Yes — John Shield's NPI (1033189634) is active in the NPPES registry as of the last update on 2024-06-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.