Mark Larsen, M.D.
NPI 1992894141 · Diagnostic Radiology Physician · Orinda, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Larsen, M.D. is a Diagnostic Radiology Physician provider in Orinda, CA (NPI 1992894141).
Provider details
- NPI number
- 1992894141
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G51274 (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
- 2006-10-12
- Last updated
- 2012-09-10
Frequently asked questions
- What is Mark Larsen's NPI number?
- Mark Larsen's National Provider Identifier (NPI) is 1992894141, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Larsen's specialty?
- Mark Larsen is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Larsen located?
- Mark Larsen's practice location on file with NPPES is 65 Loma Vista Dr, Orinda, CA 94563-2236.
- What is Mark Larsen's phone number?
- The practice phone number listed in the NPPES registry for Mark Larsen is (925) 258-4300.
- Does Mark Larsen accept Medicare?
- Mark Larsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Larsen's NPI active?
- Yes — Mark Larsen's NPI (1992894141) is active in the NPPES registry as of the last update on 2012-09-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.