IndividualActive
Kelvin Mar-Tang, MD
NPI 1679651491 · Internal Medicine Physician · Napa, CA
Kelvin Mar-Tang, MD is a Internal Medicine Physician provider in Napa, CA (NPI 1679651491).
Provider details
- NPI number
- 1679651491
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A32064 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
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
3285 Claremont Way
Napa, CA 94558-3313
Phone: (707) 258-2500
Street-level locationGet directions
Mailing address
1800 Harrison St Fl 7
Oakland, CA 94612-3429
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2007-07-08
Frequently asked questions
- What is Kelvin Mar-Tang's NPI number?
- Kelvin Mar-Tang's National Provider Identifier (NPI) is 1679651491, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kelvin Mar-Tang's specialty?
- Kelvin Mar-Tang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kelvin Mar-Tang located?
- Kelvin Mar-Tang's practice location on file with NPPES is 3285 Claremont Way, Napa, CA 94558-3313.
- What is Kelvin Mar-Tang's phone number?
- The practice phone number listed in the NPPES registry for Kelvin Mar-Tang is (707) 258-2500.
- Is Kelvin Mar-Tang's NPI active?
- Yes — Kelvin Mar-Tang's NPI (1679651491) 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.