Contact
Get in touch
The right route depends on what you need. Patient care goes through my practice; everything else can reach me directly.
Patients & appointments
Appointments are scheduled through Rocky Mountain Cancer Centers — Longmont office and virtual visits across Colorado. The office follows up within 1–2 business days. Please mention Dr. Kelly Casteel.
Request an appointmentReferring clinicians
Send a referral to Rocky Mountain Cancer Centers, Longmont, for Kelly Casteel, MD through the RMCC physician referral portal.
Physician referral portalIron & anemia care
For iron deficiency, iron deficiency anemia, or hereditary hemochromatosis, visit my focused iron practice, The Iron Doctor.
Visit The Iron DoctorMedia & speaking
For interviews, commentary, conference talks, and educational collaborations, please reach out by email.
Email for inquiries
Rocky Mountain Cancer Centers — Longmont
1760 E. Ken Pratt Blvd., Ste. 302, Longmont, CO 80504
Phone scheduling: (303) 684-1900 · Mon–Fri 8:00am–5:00pm
1760 E. Ken Pratt Blvd., Ste. 302, Longmont, CO 80504
Phone scheduling: (303) 684-1900 · Mon–Fri 8:00am–5:00pm
Please don't send personal health information or urgent medical questions through this site. If this is a medical emergency, call 911 or go to the nearest emergency department.