Roger Spencer, MD
NPI 1861423121 · Maternal & Fetal Medicine Physician · San Jose, CA
Roger Spencer, MD is a Maternal & Fetal Medicine Physician provider in San Jose, CA (NPI 1861423121).
Provider details
- NPI number
- 1861423121
- Entity type
- Individual
- Primary specialty
- Maternal & Fetal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G23444 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
- 2006-07-05
- Last updated
- 2012-02-27
Frequently asked questions
- What is Roger Spencer's NPI number?
- Roger Spencer's National Provider Identifier (NPI) is 1861423121, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Roger Spencer's specialty?
- Roger Spencer is listed in the NPPES registry with a primary specialty of Maternal & Fetal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Roger Spencer located?
- Roger Spencer's practice location on file with NPPES is 751 S Bascom Ave, San Jose, CA 95128-2604.
- What is Roger Spencer's phone number?
- The practice phone number listed in the NPPES registry for Roger Spencer is (408) 885-5550.
- Is Roger Spencer's NPI active?
- Yes — Roger Spencer's NPI (1861423121) is active in the NPPES registry as of the last update on 2012-02-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.