OrganizationActive
John D Mast MD Inc
NPI 1780662528 · Surgery Physician · Tracy, CA
John D Mast MD Inc is a Surgery Physician organization in Tracy, CA (NPI 1780662528).
Provider details
- NPI number
- 1780662528
- Entity type
- Organization
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- John Mast, MD(209) 833-3320
- License
- G34146 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
473 W Eaton Ave
Tracy, CA 95376
Phone: (209) 833-3320
Fax: (209) 835-5929
Street-level locationGet directions
Mailing address
Po Box 986
Woodbridge, CA 95258-0986
Registry dates
- Enumerated
- 2006-01-03
- Last updated
- 2010-01-06
Frequently asked questions
- What is John D Mast MD Inc's NPI number?
- John D Mast MD Inc's National Provider Identifier (NPI) is 1780662528, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John D Mast MD Inc?
- John D Mast MD Inc is classified in the NPPES registry as Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is John D Mast MD Inc located?
- John D Mast MD Inc's practice location on file with NPPES is 473 W Eaton Ave, Tracy, CA 95376.
- What is John D Mast MD Inc's phone number?
- The practice phone number listed in the NPPES registry for John D Mast MD Inc is (209) 833-3320.
- Who is the authorized official for John D Mast MD Inc?
- The authorized official listed on John D Mast MD Inc's NPPES record is John Mast, MD. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John D Mast MD Inc's NPI active?
- Yes — John D Mast MD Inc's NPI (1780662528) is active in the NPPES registry as of the last update on 2010-01-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.