Quick answers
- Which hospitals does Mark J. Loewen work at?
- Medicare's official clinician data lists Mark J. Loewen at 1 hospital: Sutter Tracy Community Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark J. Loewen see patients?
- Medicare's clinician data lists 2 practice locations, including Tracy, CA and French Camp, CA. Call before your visit to confirm the address.
- What is Mark J. Loewen's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Mark J. Loewen accept Medicare assignment?
- Yes. Medicare's clinician data says Mark J. Loewen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark J. Loewen?
- (209) 835-1500, as listed in official Medicare / NPI Registry data.
- What is Mark J. Loewen's NPI number?
- 1558625830. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark J. Loewen works
Medicare's Facility Affiliation Data lists Mark J. Loewen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Sutter Tracy Community HospitalTracy, CA · Acute Care Hospital · CCN 050313
Practice locations
Addresses where Mark J. Loewen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1420 N Tracy BlvdTracy, CA 95376 (209) 835‑1500
- 500 W Hospital RdFrench Camp, CA 95231 (209) 468‑6000
Group practices
Medicare enrollment lists Mark J. Loewen as a member of this group (CMS data updated 2026-10-02).
- Cep America - California1,292 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Tracy
Clinicians with the same Medicare primary specialty in Tracy, CA — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Western University Of Health Sciences College Of Dental Med |
| Graduation year | 2012 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1558625830 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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