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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. RONALD MARK TILSEN M.D.
NPI 1801852280
Internal Medicine in Newport Beach, CA

Active since April 25, 2006PECOS Enrolled
400 NEWPORT CENTER DR, SUITE 608, NEWPORT BEACH, CA 92660(949) 644-3559(949) 718-6729 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Ronald Mark Tilsen M.d. NPPES

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

DR. RONALD MARK TILSEN M.D. (NPI 1801852280) is an individual internal medicine provider in Newport Beach, California, licensed in California (G34508) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1801852280
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. RONALD MARK TILSENCredential: M.D.
Location Address400 NEWPORT CENTER DR, SUITE 608Newport Beach, CA 92660-7601
Mailing Address400 Newport Center Dr, Suite 608Newport Beach, CA 92660-7601 · (949) 644-3559 · Fax (949) 718-6729
Phone(949) 644-3559
Fax(949) 718-6729
Sole ProprietorNo
Enumeration DateApril 25, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1801852280 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 · G34508
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.
400 NEWPORT CENTER DR, Newport Beach, CA 92660
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ronald Mark Tilsen 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92660 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

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

KELLI JUNKER DDS
Dentist (General Practice)
400 NEWPORT CENTER DR, SUITE 708
NEWPORT BEACH, CA 92660
Orange County (949) 640-2970
DR. KYUYOUNG LIM D.M.D., M.P.H.
Dentist (Periodontics)
400 NEWPORT CENTER DR, 208
NEWPORT BEACH, CA 92660
Orange County (949) 718-0208
DR. ARTHUR JOHN HELLIWELL D.D.S.
Dentist
400 NEWPORT CENTER DR, SUITE 304
NEWPORT BEACH, CA 92660
Orange County (949) 760-6022
ROXANNE GISELLE G LIM MD
Internal Medicine (Gastroenterology)
400 NEWPORT CENTER DR, SUITE 609
NEWPORT BEACH, CA 92660
Orange County (949) 760-0398
ANNA VALERIE OTTAKA M.D.
Internal Medicine
400 NEWPORT CENTER DR, STE 608
NEWPORT BEACH, CA 92660
Orange County (949) 720-4920
JON M. GRAZER MD MPH INC
Plastic Surgery
400 NEWPORT CENTER DR, 302
NEWPORT BEACH, CA 92660
Orange County (949) 644-1240
JAMES E BARBER MD PROFESSIONAL CORPORATION
Clinic/Center (Medical Specialty)
400 NEWPORT CENTER DR, SUITE 409
NEWPORT BEACH, CA 92660
Orange County (949) 760-8040
JAMES L WINTERTON DDS, INC.
Clinic/Center (Dental)
400 NEWPORT CENTER DR, SUITE 304
NEWPORT BEACH, CA 92660
Orange County (949) 760-6022

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 Tilsen's NPI number?

The NPI number for Ronald Tilsen is 1801852280. It was assigned to this individual provider in the NPPES registry on April 25, 2006.

Where is Ronald Tilsen located?

Ronald Tilsen practices at 400 Newport Center Dr Suite 608, Newport Beach, CA 92660. The listed phone number is (949) 644-3559.

What is Ronald Tilsen's specialty?

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

Is Ronald Tilsen enrolled in Medicare?

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

When was this NPI record last updated?

The NPPES record for Ronald Tilsen was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 32 days 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.