Quick answers
- Which hospitals does Sean L. Johnston work at?
- Medicare's official clinician data lists Sean L. Johnston at 5 hospitals: Adventist Health Clearlake, Adventist Health Hanford, Adventist Health Reedley, Adventist Health Tulare and Adventist Health White Memorial. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sean L. Johnston see patients?
- Medicare's clinician data lists 13 practice locations, including Willits, CA, Quincy, CA and Chico, CA. Call before your visit to confirm the address.
- What is Sean L. Johnston's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Sean L. Johnston accept Medicare assignment?
- Medicare's clinician data says Sean L. Johnston may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Sean L. Johnston?
- (707) 459-6801, as listed in official Medicare / NPI Registry data.
- What is Sean L. Johnston's NPI number?
- 1477581866. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sean L. Johnston works
Medicare's Facility Affiliation Data lists Sean L. Johnston at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health ClearlakeClearlake, CA · Critical Access Hospital · CCN 051317
- Adventist Health HanfordHanford, CA · Acute Care Hospital · CCN 050121
- Adventist Health ReedleyReedley, CA · Acute Care Hospital · CCN 050192
- Adventist Health TulareTulare, CA · Acute Care Hospital · CCN 050784
- Adventist Health White MemorialLos Angeles, CA · Acute Care Hospital · CCN 050103
Practice locations
Addresses where Sean L. Johnston is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 13; the Medicare profile lists all.
- 1 Marcela DrWillits, CA 95490 (707) 459‑6801
- 1065 Bucks Lake RdQuincy, CA 95971 (530) 283‑2121
- 111 Raley BlvdChico, CA 95928
- 1141 Rose AveSelma, CA 93662 (559) 891‑1000
- 115 Mall DrHanford, CA 93230 (559) 582‑9000
Group practices
Medicare enrollment lists Sean L. Johnston as a member of these groups (CMS data updated 2026-10-02).
- Adventist Health Physicians Network628 clinicians in the group
- Adventist Health Clearlake Hospital Inc.87 clinicians in the group
- Willits Hospital Inc67 clinicians in the group
- Reedley Community Hospital62 clinicians in the group
- Hanford Community Hospital59 clinicians in the group
- Plumas District Hospital43 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Willits
Clinicians with the same Medicare primary specialty in Willits, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Mayo Medical School |
| Graduation year | 1998 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1477581866 |
| 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