Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ronald K Shimmin, M.D.

General Practice Physician in San Marcos, CA · enumerated 2007.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1225153315

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Registry record

Entity type Individual (Type 1)

Name Ronald K Shimmin

Credential M.D.

Sex Male

Practice address 1146 San Marino Dr, San Marcos, CA, 92078

Phone (760) 471-2033

Fax (760) 471-2083

Enumeration date Mar 20, 2007

Last updated in NPPES Mar 16, 2015

Taxonomy & licenses

2083X0100X Occupational Medicine Physician Allopathic & Osteopathic Physicians · License A37055 (CA) Secondary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License A37055 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Ronald Shimmin practice?

The practice location on file with NPPES is in San Marcos, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Ronald Shimmin?

The National Provider Identifier (NPI) for Ronald Shimmin is 1225153315, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-03-16.