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Internal Medicine Providers in Upland, CA

Browse 20 Internal Medicine providers listed in NPPES with a practice address in Upland, California.

20 Healthcare Providers

How Upland compares with the U.S.

Upland has 25 clinicians in Internal Medicine per 100,000 residents, about 57% of the U.S. rate of 44.

That is 20 active clinicians in Internal Medicine with a practice address in Upland, for a population of 79,257.

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.

83% of clinicians in Internal Medicine in Upland listed in the CMS Medicare file (10 of 12) accept Medicare assignment. That is lower than 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.

58% of clinicians in Internal Medicine in Upland listed in the CMS Medicare file (7 of 12) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher 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 Upland, CA

Source: CMS PECOS
PECOS Enrolled Specialists 16 In Upland, CA
Part B Lab & Imaging Eligible 16 Diagnostic Referrals
DME Ordering Eligible 17 Durable Medical Equipment
Home Health Agency Referrals 16 HHA Ordering Eligible
Showing 1โ€“20 of 20 providers
With recent CMS data first, then Aโ€“Z
Active NPI Status
685 N 13th Ave Ste 2, Upland, CA 917864963
Phone: 9095008683
NPI Identifier 1790289619
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Dr. Nahel Al Bouz , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
811 E 11th St Ste 203, Upland, CA 917864872
Phone: 9095816420
NPI Identifier 1326235136
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Ahmed Al-Waisi

Internal Medicine

Active NPI Status Accepts Medicare Assignment
999 San Bernardino Rd, Upland, CA 917864920
Phone: 9099852811
NPI Identifier 1871115709
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Dr. Susan Christine Biegel , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1004 W Foothill Blvd Ste 200, Upland, CA 917863774
Phone: 9099851908
NPI Identifier 1710956412
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Dr. Michael Chai , MD

Internal Medicine

Active NPI Status Telehealth Services Available
490 N Mountain Ave # B, Upland, CA 917865117
Phone: 9099206698
NPI Identifier 1083748727
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Dr. Johnny Jaehwan Choi , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
141 W Foothill Blvd, Upland, CA 917868705
Phone: 9092968800
NPI Identifier 1376640714
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Dr. Decerie Baculi Dayag , MD

Internal Medicine

Active NPI Status
811 E 11th St Ste 208, Upland, CA 917864872
Phone: 9099850883
NPI Identifier 1336660901
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Dr. David Edward Engelhardt , MD

Internal Medicine

Active NPI Status
631 N 13th Ave, Ste B, Upland, CA 917864964
Phone: 9099313838
NPI Identifier 1972595122
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Dr. Ghassan Hadi , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1060 E Foothill Blvd, Suite 103, Upland, CA 917864027
Phone: 9099818904
NPI Identifier 1558497891
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Dr. Sarina Kular , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
299 W Foothill Blvd Ste 209, Upland, CA 917863806
Phone: 9099824000
NPI Identifier 1366484883
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Dr. Ivan Ernesto Leroux , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
330 E 7th St Fl 2, Upland, CA 917866740
Phone: 8002138517
NPI Identifier 1568088110
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Dr. Sadia Fatima Moinuddin , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
901 San Bernardino Rd Ste 101, Upland, CA 917867299
Phone: 9095796753
NPI Identifier 1912293317
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Dr. Samish Amit Patel , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
440 N Mountain Ave, Suite 301, Upland, CA 917865183
Phone: 9099314034
NPI Identifier 1427480524
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Dr. Tejinder Singh , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
914 W Foothill Blvd, Ste B, Upland, CA 917863785
Phone: 9099828944
NPI Identifier 1104820729
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Dr. Michael T. Creagan , MD

Internal Medicine

Active NPI Status
1527 Spyglass Dr, Upland, CA 917862422
Phone: 9099850732
NPI Identifier 1487813002
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Dr. Bhupal Kommineni , MD FACP

Internal Medicine

Active NPI Status
1330 San Bernardino Road, Suite G, Upland, CA 917864974
Phone: 9099810989
NPI Identifier 1457324808
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Dr. Wilson Dugaduga Lao , MD

Internal Medicine

Active NPI Status
1238 E Arrow Hwy, Suite 100, Upland, CA 917864951
Phone: 9099465348
NPI Identifier 1780603761
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Dr. Cynthia Lee Serabyn , DO

Internal Medicine

Active NPI Status
1238 E Arrow Hwy, Suite 100, Upland, CA 917864951
Phone: 9099465348
NPI Identifier 1619990389
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Dr. David Tran , MD

Internal Medicine

Active NPI Status
1113 Alta Ave Ste 103, Upland, CA 917862803
Phone: 9099851908
NPI Identifier 1881830784
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Dr. Briannah Wade , MD

Internal Medicine

Active NPI Status
999 San Bernardino Rd, Upland, CA 917864920
Phone: 9099852811
NPI Identifier 1417897026
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Frequently Asked Questions about Internal Medicine in Upland

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.