Mark Allison, M.D.
NPI 1164471223 · Internal Medicine Physician · Riverside, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Allison, M.D. is a Internal Medicine Physician provider in Riverside, CA (NPI 1164471223).
Provider details
- NPI number
- 1164471223
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- C50568 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
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
Mailing address
Registry dates
- Enumerated
- 2006-05-08
- Last updated
- 2014-10-07
Frequently asked questions
- What is Mark Allison's NPI number?
- Mark Allison's National Provider Identifier (NPI) is 1164471223, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Allison's specialty?
- Mark Allison is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Allison located?
- Mark Allison's practice location on file with NPPES is 4100 Central Ave, Riverside, CA 92506-2933.
- What is Mark Allison's phone number?
- The practice phone number listed in the NPPES registry for Mark Allison is (951) 788-8332.
- Does Mark Allison accept Medicare?
- Mark Allison is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Allison's NPI active?
- Yes — Mark Allison's NPI (1164471223) is active in the NPPES registry as of the last update on 2014-10-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.