John Simmons, MD
NPI 1932287000 · Hematology & Oncology Physician · Walnut Creek, CA
John Simmons, MD is a Hematology & Oncology Physician provider in Walnut Creek, CA (NPI 1932287000).
Provider details
- NPI number
- 1932287000
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G18699 (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
- 2006-11-02
- Last updated
- 2007-07-08
Frequently asked questions
- What is John Simmons's NPI number?
- John Simmons's National Provider Identifier (NPI) is 1932287000, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Simmons's specialty?
- John Simmons is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is John Simmons located?
- John Simmons's practice location on file with NPPES is 1425 S Main St, Walnut Creek, CA 94596-5318.
- What is John Simmons's phone number?
- The practice phone number listed in the NPPES registry for John Simmons is (925) 295-4000.
- Is John Simmons's NPI active?
- Yes — John Simmons's NPI (1932287000) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.