Ronald Shimmin, M.D.
NPI 1225153315 · General Practice Physician · San Marcos, CA
Enrolled with Medicare as Practitioner - Preventive Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ronald Shimmin, M.D. is a General Practice Physician provider in San Marcos, CA (NPI 1225153315).
Provider details
- NPI number
- 1225153315
- Entity type
- Individual
- Primary specialty
- General Practice PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A37055 (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
- 2007-03-20
- Last updated
- 2015-03-16
Frequently asked questions
- What is Ronald Shimmin's NPI number?
- Ronald Shimmin's National Provider Identifier (NPI) is 1225153315, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ronald Shimmin's specialty?
- Ronald Shimmin is listed in the NPPES registry with a primary specialty of General Practice Physician (Allopathic & Osteopathic Physicians).
- Where is Ronald Shimmin located?
- Ronald Shimmin's practice location on file with NPPES is 1146 San Marino Dr, San Marcos, CA 92078-4649.
- What is Ronald Shimmin's phone number?
- The practice phone number listed in the NPPES registry for Ronald Shimmin is (760) 471-2033.
- Does Ronald Shimmin accept Medicare?
- Ronald Shimmin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ronald Shimmin's NPI active?
- Yes — Ronald Shimmin's NPI (1225153315) is active in the NPPES registry as of the last update on 2015-03-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.