Quick answers
- Does Jason R. Jeffery accept Medicare assignment?
- Yes. Medicare's clinician data says Jason R. Jeffery accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Jason R. Jeffery see?
- In 2024, CMS data shows 556 Original Medicare patients and 3,359 services for Jason R. Jeffery. This counts Original Medicare only and measures volume, not quality.
- What is Jason R. Jeffery's NPI number?
- 1427293836. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Jason R. Jeffery, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 556 |
|---|---|
| Services billed to Medicare | 3,359 |
| Different services or procedures | 23 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,524 services
- 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's (G2211)1,009 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)246 services
- Telephone medical discussion with physician, 11-20 minutes (99442)155 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)111 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure61%
- Arthritis49%
- Anxiety21%
- Diabetes19%
- Ischemic heart disease19%
Hospitals where Jason R. Jeffery works
Medicare's Facility Affiliation Data lists Jason R. Jeffery at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Adventist Health SonoraSonora, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050335
- Doctors Medical CenterModesto, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050464
- Mark Twain Medical CenterSan Andreas, CA · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 051332
- Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441
Practice locations
Addresses where Jason R. Jeffery is enrolled with Medicare (CMS data updated October 2, 2026).
- 1000 Greenley RdSonora, CA 95370 (209) 536‑5000
- 690 Guzzi Ln, Suite BSonora, CA 95370 (209) 536‑5757
- 690 Guzzi Ln, Suite CanddSonora, CA 95370 (209) 536‑3820
Group practices
Medicare enrollment lists Jason R. Jeffery as a member of this group (CMS data updated October 2, 2026).
- Sonora Community Hospital133 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Sonora
Clinicians with the same Medicare primary specialty in Sonora, CA — not a recommendation.
Other clinicians in Sonora Community Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loma Linda University School Of Medicine |
| Graduation year | 2007 (19 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1427293836 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians