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Internal Medicine in Lancaster, California

Data updated monthly · Last refresh September 2026

54 Internal Medicine providers practice in Lancaster, and 30% received drug or device company payments in 2025. Listings are drawn from federal public records and are not endorsements.

Internal Medicine providers in Lancaster

Listed alphabetically. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.

Dr. Ali Jafferi, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 948-8581
Dr. Aminu Birhan, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · Telehealth · (661) 726-2226
Dr. Anthony Dulgeroff, M.D.
Lancaster, CA · $41 in drug and device payments (2025) · Telehealth · (661) 945-5984
Dr. Antony Fung, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 726-2222
Dr. Anupam Singla, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-9411
Dr. Ashruta Patel-ahuja, DO, MS
Lancaster, CA · $28 in drug and device payments (2025) · Telehealth · (661) 874-4050
Dr. Canagaretnam Chandradas, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 948-8581
Dr. Charles Lim, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-5984
Dr. Deepak Shivaram, M.D.
Lancaster, CA · $1,128 in drug and device payments (2025) · Telehealth · (661) 949-5941
Dr. Ethan Hsu
Lancaster, CA · No drug or device payments recorded (2025) · (661) 729-2000
Dr. Ferdinand Panoussi, D.O
Lancaster, CA · $291 in drug and device payments (2025) · Telehealth · (661) 726-6254
Dr. George Mya, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-9411
Dr. Gyanesh Agrawal, M.D.
Lancaster, CA · $51 in drug and device payments (2025) · (661) 471-4000
Dr. Harihar Agarwal, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 726-5000
Dr. Hazem Aboaid, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 726-6254
Dr. Hong Phuc Nguyen, DO
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-9411
Dr. Ivy Semenez, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (877) 554-4404
Dr. Jose Pascual, M.D.
Lancaster, CA · $20 in drug and device payments (2025) · (661) 948-8581
Dr. Joseph Ahoubim, DO
Lancaster, CA · No drug or device payments recorded (2025) · (951) 617-0179
Dr. Junaid Fitter, M.D.
Lancaster, CA · $21 in drug and device payments (2025) · (661) 948-8581
Dr. Kartikey Mehta, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 948-8581
Dr. Khin Win, M.D.
Lancaster, CA · $150 in drug and device payments (2025) · (661) 945-5984
Dr. Kumarasamy Sivakumar, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 949-5908
Dr. Lawrence Okumoto
Lancaster, CA · No drug or device payments recorded (2025) · (503) 494-7735
Dr. Lay Khin, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-5984
Dr. Luis Cabrera, DO
Lancaster, CA · No drug or device payments recorded (2025) · (661) 726-6254
Dr. Manish Desai, D.O
Lancaster, CA · No drug or device payments recorded (2025) · (661) 723-2879
Dr. Marc Lorenz Montecillo, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · Telehealth · (661) 723-2442
Dr. Marla Giem, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-5984
Dr. Marvin Ginsburg, M.D.
Lancaster, CA · $260 in drug and device payments (2025) · (661) 945-5984
Dr. Marvin Ross, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 822-4402
Dr. Naili Chen, D.O., MPH, MASC
Lancaster, CA · No drug or device payments recorded (2025) · (661) 729-8655
Dr. Nilesh Hingarh, M.D.
Lancaster, CA · $712 in drug and device payments (2025) · Telehealth · (661) 414-7677
Dr. Qiyuan Dai, MD
Lancaster, CA · No drug or device payments recorded (2025) · Telehealth · (661) 942-2391
Dr. Ravi Janumpally, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 433-2072
Dr. Russell Greif, D.O.
Lancaster, CA · $662 in drug and device payments (2025) · Telehealth · (661) 726-6490
Dr. Saima Rashid, D.O.
Lancaster, CA · $185 in drug and device payments (2025) · (201) 341-0905
Dr. Sami Nafoosi, MD
Lancaster, CA · $1,028 in drug and device payments (2025) · (661) 945-5984
Dr. Sangar Selva, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 948-7496
Dr. Satya Dandamudi, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 948-4429
Dr. Shahid Hassan, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 945-5984
Dr. Shahid Siddiqui, MD
Lancaster, CA · $239 in drug and device payments (2025) · (702) 579-5858
Dr. S Joseph Marianayagam, MD
Lancaster, CA · No drug or device payments recorded (2025) · (661) 948-0012
Dr. Syed Uzair
Lancaster, CA · No drug or device payments recorded (2025) · Telehealth · (973) 429-6196
Dr. Timothy Chandler, D.O.
Lancaster, CA · No drug or device payments recorded (2025) · (833) 574-2273
Dr. Tun Oo
Lancaster, CA · No drug or device payments recorded (2025) · Telehealth · (310) 437-9421
Dr. Val Valco, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (732) 222-5200
Dr. Victor Liao, DO
Lancaster, CA · No drug or device payments recorded (2025) · (626) 688-3568
Dr. Violeta Vallejo-sinavsky, M.D.
Lancaster, CA · No drug or device payments recorded (2025) · (661) 948-8581
Dr. Xiao Wan, D.O.
Lancaster, CA · $515 in drug and device payments (2025) · Telehealth · (626) 688-3568

Conditions Internal Medicine providers in Lancaster, California commonly treat

Patients often search by condition rather than specialty. These are conditions typically managed by Internal Medicine providers. Individual practices vary, so confirm with the provider before booking.

Common questions

How many Internal Medicine providers are in Lancaster, California?

There are 54 Internal Medicine providers with active NPI records practicing in Lancaster, according to federal NPPES data refreshed monthly.

How many Internal Medicine providers in Lancaster received drug or device company payments?

16 of 54 (30%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

What conditions do Internal Medicine providers in Lancaster treat?

Internal Medicine providers in Lancaster commonly treat high blood pressure, type 2 diabetes, high cholesterol, preventive care, chronic disease management and related conditions. Individual practices vary, so confirm with the provider before booking.

Where does this data come from?

Provider records come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.

All specialties in Lancaster Internal Medicine across California

Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory.