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Internal Medicine Providers in Lancaster, CA

Browse 55 Internal Medicine providers listed in NPPES with a practice address in Lancaster, California.

55 Healthcare Providers

How Lancaster compares with the U.S.

Lancaster has 33 clinicians in Internal Medicine per 100,000 residents, about 73% of the U.S. rate of 44.

That is 55 active clinicians in Internal Medicine with a practice address in Lancaster, for a population of 169,169.

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.

97% of clinicians in Internal Medicine in Lancaster listed in the CMS Medicare file (37 of 38) 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.

32% of clinicians in Internal Medicine in Lancaster listed in the CMS Medicare file (12 of 38) 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 Lancaster, CA

Source: CMS PECOS
PECOS Enrolled Specialists 45 In Lancaster, CA
Part B Lab & Imaging Eligible 46 Diagnostic Referrals
DME Ordering Eligible 48 Durable Medical Equipment
Home Health Agency Referrals 46 HHA Ordering Eligible
Showing 1โ€“20 of 55 providers
With recent CMS data first, then Aโ€“Z

Dr. Harihar P Agarwal , MD

Internal Medicine

Active NPI Status
1359 W Avenue J, Lancaster, CA 935342935
Phone: 6617265000
NPI Identifier 1215964150
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Dr. Gyanesh Agrawal , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
335 E Avenue I, Lancaster, CA 935351916
Phone: 6614714000
NPI Identifier 1366587768
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Dr. Joseph Ahoubim , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1206 W Avenue J # 220b, Lancaster, CA 935342914
Phone: 9516170179
NPI Identifier 1477139319
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Dr. Aminu M Birhan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
Lancaster Kaiser Permanente Facility, 43112 N 15th Street West, Lancaster, CA 93534
Phone: 6617262226
NPI Identifier 1659507788
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Dr. Timothy Chandler , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
43112 15th St W, Lancaster, CA 935346219
Phone: 8335742273
NPI Identifier 1740433622
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Dr. Qiyuan Dai , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
45104 10th St W, Lancaster, CA 935342310
Phone: 6619422391
NPI Identifier 1043506728
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Dr. Satya Narayana Dandamudi , MD

Internal Medicine

Active NPI Status
44215 15th St W, Ste 103, Lancaster, CA 935344014
Phone: 6619484429
NPI Identifier 1245312107
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Dr. Manish Jayesh Desai , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
615 W Avenue L, Lancaster, CA 935347211
Phone: 6617232879
NPI Identifier 1699951830
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Dr. Anthony Jay Dulgeroff , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
43839 15th St W, Lancaster, CA 935344756
Phone: 6619455984
NPI Identifier 1720199763
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Dr. Junaid D Fitter , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
44900 60th St W, Lancaster, CA 935367618
Phone: 6619488581
NPI Identifier 1255466835
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Dr. Antony H Fung , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
43112 15th St W, Lancaster, CA 935346219
Phone: 6617262222
NPI Identifier 1477526846
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Dr. Miranda Pwen Gaw , MD

Internal Medicine

Active NPI Status
1669 W Avenue J Ste 304, Lancaster, CA 935342870
Phone: 6619517888
NPI Identifier 1891705885
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Dr. Marla Gay Giem , MD

Internal Medicine

Active NPI Status
43839 15th St W, Lancaster, CA 935344756
Phone: 6619455984
NPI Identifier 1548358005
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Dr. Russell M. Greif , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
44241 15th St W, Suite 206, Lancaster, CA 935344037
Phone: 6617266490
NPI Identifier 1669519765
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Dr. Young Min Han , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1600 W Avenue J, Lancaster, CA 935342814
Phone: 6619495000
NPI Identifier 1740691294
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Dr. Shahid Hassan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
43839 15th St W, Lancaster, CA 935344756
Phone: 6619455984
NPI Identifier 1851401988
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Dr. Nilesh Hingarh , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
43845 10th St W, 2a, Lancaster, CA 935344800
Phone: 6614147677
NPI Identifier 1265590525
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Ethan W Hsu

Internal Medicine

Active NPI Status
44750 60th St W, Lancaster, CA 935367619
Phone: 6617292000
NPI Identifier 1982270401
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Dr. Ali E Jafferi , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
44900 60th St W, Lancaster, CA 935367618
Phone: 6619488581
NPI Identifier 1912042235
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Dr. Ravi Kanth Janumpally , MD

Internal Medicine

Active NPI Status
42135 10th Street West, Lancaster, CA 93534
Phone: 6614332072
NPI Identifier 1952796542
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Frequently Asked Questions about Internal Medicine in Lancaster

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.