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Internal Medicine Providers in Colton, CA

Browse 67 Internal Medicine providers listed in NPPES with a practice address in Colton, California.

67 Healthcare Providers

How Colton compares with the U.S.

Colton has 125 clinicians in Internal Medicine per 100,000 residents, 2.8 times the U.S. rate of 44.

That is 67 active clinicians in Internal Medicine with a practice address in Colton, for a population of 53,772.

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. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

98% of clinicians in Internal Medicine in Colton listed in the CMS Medicare file (48 of 49) 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.

4% of clinicians in Internal Medicine in Colton listed in the CMS Medicare file (2 of 49) 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 Colton, CA

Source: CMS PECOS
PECOS Enrolled Specialists 56 In Colton, CA
Part B Lab & Imaging Eligible 61 Diagnostic Referrals
DME Ordering Eligible 61 Durable Medical Equipment
Home Health Agency Referrals 61 HHA Ordering Eligible
Showing 1โ€“20 of 67 providers
With recent CMS data first, then Aโ€“Z

Ramiz Alchi

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2157 Stewart St, Colton, CA 923247519
Phone: 6198738464
NPI Identifier 1841678448
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Dr. Sarkis Arabian , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095801000
NPI Identifier 1336202266
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Ankur Bhagat

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095801000
NPI Identifier 1518595123
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Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095801000
NPI Identifier 1790245116
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Dr. Daniel H Chang , MS, MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 7142626963
NPI Identifier 1568993665
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Dr. Gilbert Chen , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095806343
NPI Identifier 1013479120
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Dr. Yanfei Chen , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095801000
NPI Identifier 1437103322
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Julian Choi

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095806266
NPI Identifier 1730506395
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Adegbemisola Daniyan

Internal Medicine

Active NPI Status
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095662751
NPI Identifier 1518351972
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Kristina Dhillon

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095806266
NPI Identifier 1508227976
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Trevor Dunbar

Internal Medicine

Active NPI Status
400 N Pepper Ave, Colton, CA 923241819
Phone: 8778732762
NPI Identifier 1659900785
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Dr. Calvin Minh Duong , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1300 E Cooley Dr, Colton, CA 923243905
Phone: 9093704100
NPI Identifier 1184646119
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Dr. Anthony C Enenmoh , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095801000
NPI Identifier 1811931603
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Dr. James Corbin Ericson , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095806267
NPI Identifier 1881731032
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Dr. Henrik Ghantarchyan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095801000
NPI Identifier 1699359521
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Dr. Raffi Gharakhanian , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095806343
NPI Identifier 1811525231
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Dr. Mufadda Hasan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 6266285227
NPI Identifier 1265703847
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Dr. Sunita Sameer Hassamal , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095801000
NPI Identifier 1841654233
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Dr. Douglas J. Hay , MD

Internal Medicine

Active NPI Status
1300 E Cooley Dr, Colton, CA 923243905
Phone: 9093704100
NPI Identifier 1386690980
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Dr. Amelia Lynn Henninger , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
400 N Pepper Ave, Colton, CA 923241801
Phone: 9095801000
NPI Identifier 1932634805
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Frequently Asked Questions about Internal Medicine in Colton

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.