James Sakamoto, MD
NPI 1578641270 · Obstetrics & Gynecology Physician · Vallejo, CA
James Sakamoto, MD is a Obstetrics & Gynecology Physician provider in Vallejo, CA (NPI 1578641270).
Provider details
- NPI number
- 1578641270
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G32924 (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
- 2007-07-16
Frequently asked questions
- What is James Sakamoto's NPI number?
- James Sakamoto's National Provider Identifier (NPI) is 1578641270, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Sakamoto's specialty?
- James Sakamoto is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is James Sakamoto located?
- James Sakamoto's practice location on file with NPPES is 975 Sereno Dr, Vallejo, CA 94589-2441.
- What is James Sakamoto's phone number?
- The practice phone number listed in the NPPES registry for James Sakamoto is (707) 651-1000.
- Is James Sakamoto's NPI active?
- Yes — James Sakamoto's NPI (1578641270) is active in the NPPES registry as of the last update on 2007-07-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.