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Internal Medicine Providers in Rancho Cucamonga, CA

Browse 13 Internal Medicine providers listed in NPPES with a practice address in Rancho Cucamonga, California.

13 Healthcare Providers

How Rancho Cucamonga compares with the U.S.

Rancho Cucamonga has 7.4 clinicians in Internal Medicine per 100,000 residents, about 17% of the U.S. rate of 44.

That is 13 active clinicians in Internal Medicine with a practice address in Rancho Cucamonga, for a population of 175,411.

The California rate is 45 per 100,000 residents.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places.

100% of clinicians in Internal Medicine in Rancho Cucamonga listed in the CMS Medicare file (11 of 11) accept Medicare assignment. That is similar to the California share of 96%.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

27% of clinicians in Internal Medicine in Rancho Cucamonga listed in the CMS Medicare file (3 of 11) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower than the California share of 38%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Internal Medicine Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Internal Medicine practitioners in Rancho Cucamonga, CA

Source: CMS PECOS
PECOS Enrolled Specialists 11 In Rancho Cucamonga, CA
Part B Lab & Imaging Eligible 11 Diagnostic Referrals
DME Ordering Eligible 11 Durable Medical Equipment
Home Health Agency Referrals 11 HHA Ordering Eligible
Showing 1โ€“13 of 13 providers
With recent CMS data first, then Aโ€“Z

Dr. Mohamed S Ali , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
10165 Foothill Blvd, #26, Rancho Cucamonga, CA 917300340
Phone: 9094810800
NPI Identifier 1548395239
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Catherine Joy Cabugao

Internal Medicine

Active NPI Status Accepts Medicare Assignment
10841 White Oak Ave Ste 107, Rancho Cucamonga, CA 917303817
Phone: 9094668888
NPI Identifier 1063091098
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Dr. Tarek Ezzeddine , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
8250 White Oak Ave Ste 106, Rancho Cucamonga, CA 917307679
Phone: 9093604722
NPI Identifier 1740471879
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Yangdong He

Internal Medicine

Active NPI Status Accepts Medicare Assignment
5411 Duncaster Pl, Rancho Cucamonga, CA 917392603
Phone: 7343582738
NPI Identifier 1386907038
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Dr. Hetalben Makwana , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
9190 Haven Ave Ste 102, Rancho Cucamonga, CA 917305431
Phone: 9099810989
NPI Identifier 1093028078
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Dr. Ythanh Duy Nguyen , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
8235 Rochester Ave, Rancho Cucamonga, CA 917300718
Phone: 9094844900
NPI Identifier 1255391181
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Dr. Cong Thanh Phan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
8235 Rochester Ave Ste 110, Rancho Cucamonga, CA 917300719
Phone: 9094844900
NPI Identifier 1386778033
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Dr. Teri Lynn Rhetta , MD

Internal Medicine

Active NPI Status
10801 6th St, Rancho Cucamonga, CA 917305977
Phone: 9513353769
NPI Identifier 1669685293
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Raheel Osman Sayed

Internal Medicine

Active NPI Status Accepts Medicare Assignment
12223 Highland Ave Ste 106-526, Rancho Cucamonga, CA 917392574
Phone: 9282787267
NPI Identifier 1366804551
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Dr. Rishi Talwar , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
7974 Haven Ave Ste 210, Rancho Cucamonga, CA 917303052
Phone: 9099410661
NPI Identifier 1699184184
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Dr. Nyein Tint , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
8330 Red Oak St Ste 201, Rancho Cucamonga, CA 917300603
Phone: 9099872528
NPI Identifier 1336533447
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Dr. Carlos R Vigil , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
7974 Haven Ave, Suite 210, Rancho Cucamonga, CA 91730
Phone: 9099410661
NPI Identifier 1366494015
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Nena Tong Arciaga

Internal Medicine

Active NPI Status
8439 White Oak Ave Ste 1038439, Rancho Cucamonga, CA 917300621
Phone: 8185322222
NPI Identifier 1497594097
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Frequently Asked Questions about Internal Medicine in Rancho Cucamonga

How do I check a Internal Medicine practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the California licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.