Charlene Niizawa, M.D.
NPI 1558449314 · Occupational Medicine Physician · Union City, CA
Enrolled with Medicare as Practitioner - Physical Medicine and Rehabilitation · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charlene Niizawa, M.D. is a Occupational Medicine Physician provider in Union City, CA (NPI 1558449314).
Provider details
- NPI number
- 1558449314
- Entity type
- Individual
- Primary specialty
- Occupational Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- G77048 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2021-12-02
Frequently asked questions
- What is Charlene Niizawa's NPI number?
- Charlene Niizawa's National Provider Identifier (NPI) is 1558449314, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charlene Niizawa's specialty?
- Charlene Niizawa is listed in the NPPES registry with a primary specialty of Occupational Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Charlene Niizawa located?
- Charlene Niizawa's practice location on file with NPPES is 3553 Whipple Rd, Union City, CA 94587-1507.
- What is Charlene Niizawa's phone number?
- The practice phone number listed in the NPPES registry for Charlene Niizawa is (510) 454-1000.
- Does Charlene Niizawa accept Medicare?
- Charlene Niizawa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charlene Niizawa's NPI active?
- Yes — Charlene Niizawa's NPI (1558449314) is active in the NPPES registry as of the last update on 2021-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.