Mark Ellis, MD
NPI 1144317462 · Infectious Disease Physician · Fairfield, CA
Mark Ellis, MD is a Infectious Disease Physician provider in Fairfield, CA (NPI 1144317462).
Provider details
- NPI number
- 1144317462
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A26035 (CA)
Specialties & taxonomies
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
- 2006-10-06
- Last updated
- 2025-09-11
Frequently asked questions
- What is Mark Ellis's NPI number?
- Mark Ellis's National Provider Identifier (NPI) is 1144317462, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Ellis's specialty?
- Mark Ellis is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Ellis located?
- Mark Ellis's practice location on file with NPPES is 1234 Empire St, Fairfield, CA 94533-5711.
- What is Mark Ellis's phone number?
- The practice phone number listed in the NPPES registry for Mark Ellis is (707) 426-3911.
- Is Mark Ellis's NPI active?
- Yes — Mark Ellis's NPI (1144317462) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.