Hematologists (Internal Medicine) in California
Data updated monthly · Last refresh October 2026
179 Hematology (Internal Medicine) providers practice in California, including 105 (59%) offering telehealth. The largest concentration is in Duarte. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.
179providers
105telehealth
Duartetop city
Hematology (Internal Medicine) by city in California
Choose a city to see providers there.
Where Hematologists (Internal Medicine) in California practice
From CMS Medicare enrollment records covering 131 of the 179 providers listed here (73%). Providers who do not bill Medicare are not included in these figures.
7%solo or small practice (under 10 clinicians)
0%mid-size group (10 to 99)
93%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Hematologists (Internal Medicine) | All clinicians in group | Main city |
| City of Hope Medical Foundation | 56 | 964 | Duarte |
| Stanford Health Care | 40 | 3,152 | Stanford |
| University of California San Francisco | 9 | 1,780 | San Francisco |
| UCSF Medical Group Business Services | 7 | 1,533 | San Francisco |
| Regents of the University of California | 7 | 706 | San Francisco |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Hematologists (Internal Medicine) affiliated |
| Stanford Health Care | Stanford | Nonprofit | 5 of 5 | 41 |
| Stanford Health Care Tri-Valley | Pleasanton | Nonprofit | 5 of 5 | 13 |
| UCSF Medical Center | San Francisco | Nonprofit | 4 of 5 | 10 |
| Keck Hospital of Usc | Los Angeles | Nonprofit | 5 of 5 | 5 |
| Los Angeles General Medical Center | Los Angeles | Government | 2 of 5 | 4 |
Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.
Hematology (Internal Medicine) providers in California
Listed by city, largest first. 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. Irene Dy, MDCastro Valley, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 888-0657 Dr. Nitin Joshi, M.D.Castro Valley, CA · $15 in drug and device payments (2025) · Telehealth ·
(510) 888-0657 Dr. Labib Hashimi, M.D.Chino, CA · $3,979 in drug and device payments (2025) ·
(909) 591-0814 Dr. Adam Braun, MDDuarte, CA · $389 in drug and device payments (2025) · Telehealth ·
(800) 826-4673 Dr. Ahmed Aribi, MDDuarte, CA · $36 in drug and device payments (2025) · Telehealth ·
(626) 359-8111 Dr. Alexandra Levine, M.D.Duarte, CA · No drug or device payments recorded (2025) ·
(626) 471-7213 Dr. Alexey Danilov, M.D.Duarte, CA · $72,278 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Alex Herrera, MDDuarte, CA · $26,840 in drug and device payments (2025) · Telehealth ·
(626) 775-3514 Dr. Amanda BlackmonDuarte, CA · $170 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Amandeep Salhotra, MDDuarte, CA · $94,626 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Amrita Krishnan, MDDuarte, CA · $102,830 in drug and device payments (2025) · Telehealth ·
(626) 359-8111 Dr. Andrew Artz, M.D., M.S.Duarte, CA · $34,976 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Anthony Stein, MDDuarte, CA · $16,627 in drug and device payments (2025) ·
(626) 256-4673 Dr. Avyakta Kallam, M.D., M.B.B.SDuarte, CA · $1,828 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Brian Ball, M.D.Duarte, CA · $4,082 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Chatchada Karanes, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Christina Poh, M.D.Duarte, CA · $27,295 in drug and device payments (2025) · Telehealth ·
(800) 826-4673 Dr. David Snyder, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Eileen Smith, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 256-4673 Dr. Forrest Stewart, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 256-4673 Dr. Geoffrey Shouse, D.O., PH.D.Duarte, CA · $36,623 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Guido Marcucci, M.D.Duarte, CA · No drug or device payments recorded (2025) · Telehealth ·
(626) 256-4673 Dr. Haris Ali, M.D.Duarte, CA · $27,725 in drug and device payments (2025) · Telehealth ·
(626) 359-8111 Dr. Ibrahim Aldoss, M.D.Duarte, CA · $71,785 in drug and device payments (2025) ·
(626) 256-4673 Dr. Idoroenyi Amanam, M.D.Duarte, CA · $22,670 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Jasmine Zain, MDDuarte, CA · $1,952 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. John Baird, MDDuarte, CA · $36,204 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Joseph Alvarnas, M.D.Duarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Kamehameha Wong, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Karamjeet Sandhu, M.DDuarte, CA · $5,537 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Larry Kwak, M.D. , PHDDuarte, CA · $27,516 in drug and device payments (2025) ·
(626) 256-4673 Dr. Leslie Popplewell, M.D.Duarte, CA · $612 in drug and device payments (2025) · Telehealth ·
(626) 359-8111 Dr. Liana Nikolaenko, M.D.Duarte, CA · No drug or device payments recorded (2025) ·
(626) 256-4673 Dr. Lihua Budde, MD, PHDDuarte, CA · $6,180 in drug and device payments (2025) · Telehealth ·
(626) 359-8111 Dr. Matthew Mei, M.D.Duarte, CA · $313 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Mhd Monzr Al Malki, M.D.Duarte, CA · $25,642 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Michael Rosenzweig, M.D.Duarte, CA · $1,806 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Murali Janakiram, MDDuarte, CA · $33,700 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Myo Htut, M.D.Duarte, CA · $338 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Niloufer Khan, M.D.Duarte, CA · $2,422 in drug and device payments (2025) ·
(626) 218-2405 Dr. Nitya Nathwani, M.D.Duarte, CA · No drug or device payments recorded (2025) · Telehealth ·
(626) 256-4673 Dr. Pablo Parker, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Paul Koller, M.D.Duarte, CA · $203 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Peter Lee, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Ravi Bhatia, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Robert Jenq, M.D.Duarte, CA · No drug or device payments recorded (2025) ·
(626) 256-4673 Dr. Ryotaro Nakamura, MDDuarte, CA · $20,958 in drug and device payments (2025) · Telehealth ·
(626) 359-8111 Dr. Salman OtoukeshDuarte, CA · $688 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Common questions
How many Hematology (Internal Medicine) providers are in California?There are 179 Hematology (Internal Medicine) providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Hematology (Internal Medicine) providers in California offer telehealth?Yes. 105 of the 179 Hematology (Internal Medicine) providers in California (about 59%) report offering telehealth services in CMS data.
Which cities in California have the most Hematology (Internal Medicine) providers?Duarte (62), Stanford (44), San Francisco (17) have the highest concentration of Hematology (Internal Medicine) providers in California.
How many Hematology (Internal Medicine) providers in California received drug or device company payments?106 of 179 Hematology (Internal Medicine) providers in California (59%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
Where does this data come from?Provider counts and profiles 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.
Do most Hematologists (Internal Medicine) in California work in independent practices or large health systems?Among 131 Hematologists (Internal Medicine) in California enrolled in Medicare, 7% bill through a solo or small practice with fewer than 10 clinicians, 0% through a mid-size group of 10 to 99, and 93% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Hematologists (Internal Medicine) in California work at?According to CMS facility affiliation records, the California hospitals where the most Hematologists (Internal Medicine) hold privileges are Stanford Health Care in Stanford; Stanford Health Care Tri-Valley in Pleasanton; UCSF Medical Center in San Francisco.
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