John Larsen, M.D.
NPI 1578610739 · Sports Medicine (Neuromusculoskeletal Medicine) Physician · Oxnard, CA
John Larsen, M.D. is a Sports Medicine (Neuromusculoskeletal Medicine) Physician provider in Oxnard, CA (NPI 1578610739).
Provider details
- NPI number
- 1578610739
- Entity type
- Individual
- Primary specialty
- Sports Medicine (Neuromusculoskeletal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G61959 (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
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
- 2007-01-03
- Last updated
- 2007-07-08
Frequently asked questions
- What is John Larsen's NPI number?
- John Larsen's National Provider Identifier (NPI) is 1578610739, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Larsen's specialty?
- John Larsen is listed in the NPPES registry with a primary specialty of Sports Medicine (Neuromusculoskeletal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is John Larsen located?
- John Larsen's practice location on file with NPPES is 1700 Lombard St, Oxnard, CA 93030-8211.
- What is John Larsen's phone number?
- The practice phone number listed in the NPPES registry for John Larsen is (805) 988-6510.
- Is John Larsen's NPI active?
- Yes — John Larsen's NPI (1578610739) 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.