Sandra Koyama, MD
NPI 1548331507 · Internal Medicine Physician · Baldwin Park, CA
Sandra Koyama, MD is a Internal Medicine Physician provider in Baldwin Park, CA (NPI 1548331507).
Provider details
- NPI number
- 1548331507
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G65748 (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
- 2006-11-13
- Last updated
- 2021-12-02
Frequently asked questions
- What is Sandra Koyama's NPI number?
- Sandra Koyama's National Provider Identifier (NPI) is 1548331507, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sandra Koyama's specialty?
- Sandra Koyama is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sandra Koyama located?
- Sandra Koyama's practice location on file with NPPES is 1011 Baldwin Park Blvd, Baldwin Park, CA 91706-5806.
- What is Sandra Koyama's phone number?
- The practice phone number listed in the NPPES registry for Sandra Koyama is (626) 851-1011.
- Is Sandra Koyama's NPI active?
- Yes — Sandra Koyama's NPI (1548331507) 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.