Quick answers
- Which hospitals does Don J. Nishiguchi work at?
- Medicare's official clinician data lists Don J. Nishiguchi at 1 hospital: Henry Mayo Newhall Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Don J. Nishiguchi see patients?
- Medicare's clinician data lists 1 practice location in Valencia, CA. Call before your visit to confirm the address.
- What is Don J. Nishiguchi's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Don J. Nishiguchi accept Medicare assignment?
- Yes. Medicare's clinician data says Don J. Nishiguchi 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 Don J. Nishiguchi?
- (661) 200-1720, as listed in official Medicare / NPI Registry data.
- What is Don J. Nishiguchi's NPI number?
- 1043368277. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Don J. Nishiguchi works
Medicare's Facility Affiliation Data lists Don J. Nishiguchi at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Henry Mayo Newhall HospitalValencia, CA · Acute Care Hospital · CCN 050624
Practice locations
Addresses where Don J. Nishiguchi is enrolled with Medicare (CMS data updated 2026-10-02).
- 27871 Smyth Dr, Suite 102Valencia, CA 91355 (661) 200‑1720
Group practices
Medicare enrollment lists Don J. Nishiguchi as a member of these groups (CMS data updated 2026-10-02).
- SCCT Medical Group PC12 clinicians in the group
- Henry Mayo Newhall Clinics LLC10 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Valencia
Clinicians with the same Medicare primary specialty in Valencia, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Ohio State University College Of Medicine |
| Graduation year | 1980 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1043368277 |
| 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