John Maddox, MD
NPI 1790837508 · Dermatology Physician · Greenbrae, CA
John Maddox, MD is a Dermatology Physician provider in Greenbrae, CA (NPI 1790837508).
Provider details
- NPI number
- 1790837508
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G40606 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
- 2007-01-18
- Last updated
- 2015-07-01
Frequently asked questions
- What is John Maddox's NPI number?
- John Maddox's National Provider Identifier (NPI) is 1790837508, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Maddox's specialty?
- John Maddox is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is John Maddox located?
- John Maddox's practice location on file with NPPES is 1300 S Eliseo Dr Ste 207, Greenbrae, CA 94904-2015.
- What is John Maddox's phone number?
- The practice phone number listed in the NPPES registry for John Maddox is (415) 925-0550.
- Is John Maddox's NPI active?
- Yes — John Maddox's NPI (1790837508) is active in the NPPES registry as of the last update on 2015-07-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.