HealthcareDiscovery.AI / Doctors / Colorado / Longmont / Hematology & Oncology

Hematology & Oncology in Longmont, Colorado

Data updated monthly · Last refresh September 2026

6 Hematology & Oncology providers practice in Longmont. Listings are drawn from federal public records and are not endorsements.

Hematology & Oncology providers in Longmont

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. Hossein Maymani, MD
Longmont, CO · $62 in drug and device payments (2025) · Telehealth · (303) 684-1900
Dr. John Barnett, MD
Longmont, CO · $125 in drug and device payments (2025) · Telehealth · (303) 684-1900
Dr. Kelly Casteel, MD
Longmont, CO · No drug or device payments recorded (2025) · Telehealth · (303) 684-1900
Dr. Michael Johnson, MD
Longmont, CO · $19 in drug and device payments (2025) · (303) 684-1900
Dr. Robert Fisher, MD
Longmont, CO · No drug or device payments recorded (2025) · (303) 684-1900
Dr. Sara Robinson, M.D.
Longmont, CO · No drug or device payments recorded (2025) · Telehealth · (303) 684-1900

Conditions Hematology & Oncology providers in Longmont, Colorado commonly treat

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

Common questions

How many Hematology & Oncology providers are in Longmont, Colorado?

There are 6 Hematology & Oncology providers with active NPI records practicing in Longmont, according to federal NPPES data refreshed monthly.

What conditions do Hematology & Oncology providers in Longmont treat?

Hematology & Oncology providers in Longmont commonly treat breast cancer, lung cancer, lymphoma, leukemia, anemia 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 Longmont Hematology & Oncology across Colorado

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.