Quick answers
- Which hospitals does Gregory A. Niderost work at?
- Medicare's official clinician data lists Gregory A. Niderost at 1 hospital: Adventist Health Howard Memorial. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory A. Niderost see patients?
- Medicare's clinician data lists 2 practice locations, including Willits, CA. Call before your visit to confirm the address.
- What is Gregory A. Niderost's specialty?
- Medicare lists Certified Registered Nurse Anesthetist (CRNA) as the primary specialty.
- Does Gregory A. Niderost accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory A. Niderost 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 Gregory A. Niderost?
- (707) 459-6801, as listed in official Medicare / NPI Registry data.
- What is Gregory A. Niderost's NPI number?
- 1255319679. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory A. Niderost works
Medicare's Facility Affiliation Data lists Gregory A. Niderost at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health Howard MemorialWillits, CA · Critical Access Hospital · CCN 051310
Practice locations
Addresses where Gregory A. Niderost is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Marcela DrWillits, CA 95490 (707) 459‑6801
- 3 Marcela Dr, Suite DWillits, CA 95490 (707) 459‑4220
Group practices
Medicare enrollment lists Gregory A. Niderost as a member of this group (CMS data updated 2026-10-02).
- Willits Hospital Inc67 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), California →
Other nurse anesthetists in Willits
Clinicians with the same Medicare primary specialty in Willits, CA — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| Graduation year | 1990 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1255319679 |
| 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