What is John Diaz's NPI number?

John Diaz's National Provider Identifier (NPI) is 1235929688, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is John Diaz's specialty?

John Diaz is listed in the NPPES registry with a primary specialty of Contractor (Other Service Providers).

Where is John Diaz located?

John Diaz's practice location on file with NPPES is 1190 Burnett Ave Ste a, Concord, CA 94520-5612.

What is John Diaz's phone number?

The practice phone number listed in the NPPES registry for John Diaz is (925) 462-5600.

Is John Diaz's NPI active?

Yes — John Diaz's NPI (1235929688) is active in the NPPES registry as of the last update on 2025-05-08.

IndividualActive

John Diaz

NPI 1235929688 · Contractor · Concord, CA

John Diaz is a Contractor provider in Concord, CA (NPI 1235929688).

Provider details

NPI number: 1235929688
Entity type: Individual
Primary specialty: ContractorOther Service Providers
Sex: Male
Sole proprietor: No

Specialties & taxonomies

ContractorPrimary171W00000X
Other Service Providers

Profile Score

Basic profile(48/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
1 yr in NPPES registry
Profile completeness38% of score
83% 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

1190 Burnett Ave Ste a

Concord, CA 94520-5612

Phone: (925) 462-5600

Street-level locationGet directions

More CA providers

Mailing address