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NEWPORT CENTER MEDICAL GROUP
NPI 1467478008
Internal Medicine - Endocrinology, Diabetes & Metabolism in Newport Beach, CA

Active since July 15, 2006
400 NEWPORT CENTER DR, SUITE 504, NEWPORT BEACH, CA 92660(949) 720-4920(949) 720-4928 Get Directions Write a Review

NPPES record last updated: August 25, 2015. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Newport Center Medical Group NPPES

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

NEWPORT CENTER MEDICAL GROUP (NPI 1467478008) is a healthcare organization registered as an endocrinology, diabetes & metabolism in Newport Beach, California and active in the NPI registry since July 2006. The organization lists Ronald Mark Tilsen, Managing Partner, as its authorized official.

NPPES Registry Identity

NPI1467478008
Entity TypeOrganization
Primary Taxonomy207RE0101X
Legal Business NameNEWPORT CENTER MEDICAL GROUP
Location Address400 NEWPORT CENTER DR, SUITE 504Newport Beach, CA 92660-7601
Mailing Address400 Newport Center Dr, Suite 504Newport Beach, CA 92660-7601 · (949) 720-4920 · Fax (949) 720-4928
Phone(949) 720-4920
Fax(949) 720-4928
Organization SubpartNo
Authorized OfficialRonald Mark TilsenManaging Partner · (949) 720-4920
Enumeration DateJuly 15, 2006
Last NPPES UpdateAugust 25, 2015
✔ NPI 1467478008 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
400 NEWPORT CENTER DR, Newport Beach, CA 92660
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Other Identifiers 1

Medicare ID-Type UnspecifiedW11857CA

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 MULTIPLE 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)

Newport Center Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

9

Medicare enrollment records show 9 clinicians reassign Medicare billing to Newport Center Medical Group, which bills Medicare for the services they deliver. Of these, 6 practice at this address and 7 within 10 miles. They are listed nearest first.

Clinicians, nearest first (9)

Anna Ottaka, M.D.
Internal Medicine
NPI 1154613685
400 NEWPORT CENTER DR STE 608
Newport Beach, CA 92660
(949) 720-4920
✔ PECOSSame address
Susan Cederstrom, M.D.
Internal Medicine
NPI 1578529012
400 NEWPORT CENTER DR SUITE 608
Newport Beach, CA 92660
(949) 644-3565
✔ PECOSSame address
William Fukuda, M.D.
Internal Medicine
NPI 1396701850
400 NEWPORT CENTER DR SUITE 608
Newport Beach, CA 92660
(949) 644-3551
✔ PECOS✔ Accepts MedicareSame address
Bradley Kays, M.D.
Internal Medicine
NPI 1417914334
400 NEWPORT CENTER DR SUITE 608
Newport Beach, CA 92660
(949) 644-3566
✔ PECOS✔ Accepts MedicareSame address
Amy Teresi, M.D.
Endocrinology
NPI 1265498703
400 NEWPORT CENTER DR SUITE 608
Newport Beach, CA 92660
(949) 644-3568
✔ PECOS✔ Accepts MedicareSame address
Ronald Tilsen, M.D.
Internal Medicine
NPI 1801852280
400 NEWPORT CENTER DR SUITE 608
Newport Beach, CA 92660
(949) 644-3559
✔ PECOSSame address
Sevitlana Safaei, MD
Internal Medicine
NPI 1013065812
520 SUPERIOR AVE STE 205
Newport Beach, CA 92663
(949) 650-2462
✔ PECOS✔ Accepts Medicare3.3 mi
Stephen Nguyen, MD
Internal Medicine
NPI 1619976644
29798 HAUN RD STE 206
Sun City, CA 92586
(951) 672-4900
✔ PECOS✔ Accepts Medicare41 mi
Syed Naqvi, MD
Family Practice
NPI 1659567733
1107 WEST POPLAR AVE.
Porterville, CA 93257
(559) 781-7242
✔ PECOS✔ Accepts Medicare181 mi

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 Newport Center Medical Group's NPI number?

The NPI number for Newport Center Medical Group is 1467478008. It was assigned to this organization in the NPPES registry on July 15, 2006.

Where is Newport Center Medical Group located?

Newport Center Medical Group is located at 400 Newport Center Dr Suite 504, Newport Beach, CA 92660. The listed phone number is (949) 720-4920.

What is Newport Center Medical Group's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Newport Center Medical Group enrolled in Medicare?

Yes. Newport Center Medical Group is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Newport Center Medical Group?

According to the CMS Revalidation Reassignment List (October 2026 release), 9 clinicians in 3 Medicare specialties reassign their Medicare billing to Newport Center Medical 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. The largest specialties are Internal Medicine (7), Endocrinology (1) and Family Practice (1). Of these, 6 practice at this address and 7 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Newport Center Medical Group was last updated on August 25, 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.