Quick answers
- Does John M. Wiemann Iv accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Wiemann Iv 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.
- What is John M. Wiemann Iv's NPI number?
- 1730228768. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John M. Wiemann Iv works
Medicare's Facility Affiliation Data lists John M. Wiemann Iv 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.
- Hazel Hawkins Memorial HospitalHollister, CA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 051337
Practice locations
Addresses where John M. Wiemann Iv is enrolled with Medicare (CMS data updated October 2, 2026).
- 911 Sunset DrHollister, CA 95023
Group practices
Medicare enrollment lists John M. Wiemann Iv as a member of this group (CMS data updated October 2, 2026).
- Hazel Hawkins Memorial Hospital52 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Hollister
Clinicians with the same Medicare primary specialty in Hollister, CA — not a recommendation.
Other clinicians in Hazel Hawkins Memorial Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Diego School Of Medicine |
| Graduation year | 2006 (20 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1730228768 |
| 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
- 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