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GREG A. BROWN, M.D.
NPI 1891839155
Internal Medicine in San Clemente, CA

Active since February 19, 2007
655 CAMINO DE LOS MARES, SUITE 124, SAN CLEMENTE, CA 92673(949) 661-9657(949) 661-1352 Get Directions Write a Review

NPPES record last updated: November 7, 2008. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Greg A. Brown, M.d. NPPES

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

GREG A. BROWN, M.D. (NPI 1891839155) is a healthcare organization registered as an internal medicine in San Clemente, California and active in the NPI registry since February 2007. The organization lists Greg A Brown, Owner, as its authorized official.

NPPES Registry Identity

NPI1891839155
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameDANA NIGUEL INTERNAL MEDICINE GROUP
Location Address655 CAMINO DE LOS MARES, SUITE 124San Clemente, CA 92673-2809
Mailing Address655 Camino De Los Mares, Suite 124San Clemente, CA 92673-2809 · (949) 661-9657 · Fax (949) 661-1352
Phone(949) 661-9657
Fax(949) 661-1352
Organization SubpartNo
Authorized OfficialGreg A BrownOwner · (949) 495-4305
Enumeration DateFebruary 19, 2007
Last NPPES UpdateNovember 7, 2008
✔ NPI 1891839155 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A40335
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
655 CAMINO DE LOS MARES, San Clemente, CA 92673
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Other Names 1

Doing Business AsGreg A. Brown, M.d.

Other Identifiers 2

Medicare UPINA85437CA
Medicare ID-Type UnspecifiedW10524CA

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Greg A. Brown, M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Greg A. Brown, M.D., which bills Medicare for the services this clinician delivers.

Clinician (1)

Greg Brown, M.D.
Internal Medicine
NPI 1720135346
655 CAMINO DE LOS MARES SUITE 124
San Clemente, CA 92673
(949) 661-9657
✔ PECOS✔ Accepts MedicareSame address

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

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 Dana Niguel Internal Medicine Group's NPI number?

The NPI number for Dana Niguel Internal Medicine Group is 1891839155. It was assigned to this organization in the NPPES registry on February 19, 2007. The provider is doing business as Greg A. Brown, M.D..

Where is Dana Niguel Internal Medicine Group located?

Dana Niguel Internal Medicine Group is located at 655 Camino De Los Mares Suite 124, San Clemente, CA 92673. The listed phone number is (949) 661-9657.

What is Dana Niguel Internal Medicine Group's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Dana Niguel Internal Medicine Group enrolled in Medicare?

Yes. Dana Niguel Internal Medicine Group is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Dana Niguel Internal Medicine Group?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Dana Niguel Internal Medicine Group. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Dana Niguel Internal Medicine Group was last updated on November 7, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.