1. Home
  2. Directory
  3. California
  4. San Marcos
  5. General Practice
  6. NPI Profile

RONALD K SHIMMIN M.D.
NPI 1225153315
General Practice in San Marcos, CA

Active since March 20, 2007PECOS Enrolled
1146 SAN MARINO DR, SAN MARCOS, CA 92078(760) 471-2033(760) 471-2083 Get Directions Write a Review

NPPES record last updated: March 16, 2015. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Ronald K Shimmin M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

RONALD K SHIMMIN M.D. (NPI 1225153315) is an individual general practice provider in San Marcos, California, licensed in California (A37055) and active in the NPI registry since March 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1225153315
Entity TypeIndividualMale
Primary Taxonomy208D00000X
Provider Legal NameRONALD K SHIMMINCredential: M.D.
Location Address1146 SAN MARINO DRSan Marcos, CA 92078-4649
Mailing Address5080 Spectrum Dr, Suite 1200 WestAddison, TX 75001-4648 · (972) 364-8000
Phone(760) 471-2033
Fax(760) 471-2083
Sole ProprietorNo
Enumeration DateMarch 20, 2007
Last NPPES UpdateMarch 16, 2015
✔ NPI 1225153315 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyGeneral PracticeAllopathic & Osteopathic Physicians
Taxonomy Code208D00000X
License✔ Licensed in CA · A37055
Definition
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions. Source: National Uniform Claim Committee
Also ListedPreventive Medicine · Occupational MedicineTaxonomy 2083X0100X · License A37055 (CA)
1146 SAN MARINO DR, San Marcos, CA 92078
Open in Google Maps ↗

Other Identifiers 8

Medicare UPINCE921TCA
Medicare UPINCE921SCA
Medicare UPINCE921UCA
Medicare UPINCE921XCA
Medicare UPINCE921VCA
Medicare UPINCE921WCA
Medicare UPINCE921YCA
Medicare UPINCE921ZCA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ronald K Shimmin M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Ronald Shimmin reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Lake Medical Center, Inc.
0.1 mi
Neurology
1146 SAN MARINO DR
San Marcos, CA 92078
  • Reassigned Medicare billing, California enrollment
  • 5 clinicians in this Medicare group
NPI 1689863714 (760) 471-2033

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 9

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. JILL ELLEN ANNA MAUSER DC
Chiropractor
1146 SAN MARINO DR
SAN MARCOS, CA 92078
San Diego County (760) 471-2033
DR. STEVEN G FARMER DPM
Podiatrist (Primary Podiatric Medicine)
1146 SAN MARINO DR
SAN MARCOS, CA 92078
San Diego County (760) 420-8848
GABRIEL S. WEISS, MD APC
Clinic/Center (Primary Care)
1146 SAN MARINO DR
SAN MARCOS, CA 92078
San Diego County (760) 630-5613
DALE MICHAEL MAUSER DC
Chiropractor
1146 SAN MARINO DR
SAN MARCOS, CA 92078
San Diego County (760) 471-2033
MAUSER JEPPESEN MAUSER
Chiropractor
1146 SAN MARINO DR
SAN MARCOS, CA 92078
San Diego County (760) 471-1477
LAKE MEDICAL CENTER, INC.
Psychiatry & Neurology (Neurology)
1146 SAN MARINO DR
SAN MARCOS, CA 92078
San Diego County (760) 471-2033
DR. LANCE FIELDS JEPPESEN DC
Chiropractor
1146 SAN MARINO DR
SAN MARCOS, CA 92078
San Diego County (760) 471-2033
DR. TINGTING ROSE DACM
Acupuncturist
1146 SAN MARINO DR
SAN MARCOS, CA 92078
San Diego County (760) 896-1883

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ronald Shimmin's NPI number?

The NPI number for Ronald Shimmin is 1225153315. It was assigned to this individual provider in the NPPES registry on March 20, 2007.

Where is Ronald Shimmin located?

Ronald Shimmin practices at 1146 San Marino Dr, San Marcos, CA 92078. The listed phone number is (760) 471-2033.

What is Ronald Shimmin's specialty?

The primary specialty registered for this NPI is General Practice with taxonomy code 208D00000X.

Is Ronald Shimmin enrolled in Medicare?

Yes. Ronald Shimmin is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Ronald Shimmin's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ronald Shimmin reassigns Medicare benefits to Lake Medical Center, Inc. (San Marcos, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ronald Shimmin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ronald Shimmin was last updated on March 16, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.