Summary

Dr. Jonathan Kloss is an oncologist and internal medicine physician who brings over four decades of medical experience to his practice. He earned his medical degree from Universidad Del Noreste Escuela De Medicina Dr Jose Sierra Flores and completed his residency training at North Shore University Hospital. Dr. Kloss is fluent in both Spanish and English, allowing him to serve a diverse patient population.

Dr. Kloss practices at multiple locations in Cortland, New York, including Guthrie Cortland Medical Center and The Renzi Cancer Center at Guthrie Cortland Medical Center. He is affiliated with Lourdes Hospital, Wilson Medical Center, and Guthrie Cortland Medical Center. His expertise includes treating conditions such as deep vein thrombosis and blood clots, as well as addressing concerning symptoms like coughing up blood. He performs essential diagnostic procedures including complete blood counts and specialized blood tests to monitor iron levels. Patients have given him an average rating of 3.1 out of 5 stars.
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Overview based on verified provider data

Quick Facts

  • 3.1
  • 41 years of experience
  • speaks Spanish, English
  • North Shore University Hospital
  • 4 written reviews
  • 2 specialties
  • 13 areas of expertise
  • 2 board certifications
  • 3 hospital affiliations
  • 3 office locations
  • Male

Patients’ Perspective

  • Provided follow-up after the visit
  • Flexible scheduling

Office Locations

Dr. Jonathan David Kloss has 3 locations

The Renzi Cancer Center at Guthrie Cortland Medical Center

34 W Main StCortland, NY 13045

Dr. Jonathan David Kloss

34 WEAT MAIN STCORTLAND, NY 13045

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Dr. Jonathan David Kloss, MDDr. Muhammad Ahmad Wattoo, MDDr. Paul Stefek, MDDr. Dana Gabriela Negoi, MD
OncologyInternal MedicineCardiovascular DiseaseNephrology
Accepts New Patients
3.1 
4.9 
4.8 
3.4 
41 Years of Experience 35 Years of Experience 45 Years of Experience 33 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks Spanish, English Speaks English Speaks English Speaks Spanish, German
Cortland , NYIthaca , NYIthaca , NYIthaca , NY
Med School: Universidad Del Noreste Escuela De Medicina Dr Jose Sierra Flores Med School: Allama Iqbal Medical College Med School: New York Medical College Med School: Universitatea De Medicina Si Farmacie Carol Davila
Current Profile
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Insurance Plans Accepted by Dr. Jonathan David Kloss

Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.

Medical Specialties

Dr. Jonathan David Kloss has the following 2 specialties

Specialty Expertise

Dr. Jonathan David Kloss has the following 13 areas of expertise

  • Blood Cancer
  • Bone Marrow Transplant
  • Cancer
  • Chemotherapy
  • Chronic Myeloid Leukemia
  • Chronic Myelomonocytic Leukemia
  • Deep Vein Thrombosis
  • Hepatitis C
  • Internal Medicine
  • Leukemia
  • Lymphoma
  • Myelofibrosis
  • Myeloma

Certifications, License, & Education

41 Years Experience

Dr. Jonathan David Kloss holds an expired medical license in the state of New York.

Medical License

Medical Doctor with an expired medical license in the state of New York that expired in 2026.

Education & Training

Residency

Completed their residency at North Shore University Hospital.

Medical School

Graduated from Universidad Del Noreste Escuela De Medicina Dr Jose Sierra Flores in 1985.

NPI Number

Dr. Kloss' NPI number is 1134118565.

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Frequently Asked Questions

Does Dr. Jonathan Kloss accept virtual/telehealth appointments?
Dr. Jonathan Kloss has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
What languages does Dr. Jonathan Kloss speak?
Dr. Jonathan Kloss speaks Spanish and English.
Which hospitals is Dr. Jonathan Kloss affiliated with?
Dr. Jonathan Kloss is affiliated with Lourdes Hospital, Wilson Medical Center, and Guthrie Cortland Medical Center.
How can I make an appointment with Dr. Jonathan Kloss?
You can find contact information for Dr. Jonathan Kloss here on Vitals.
Where is Dr. Jonathan Kloss's office located?
Dr. Jonathan Kloss's office is located at 134 Homer Ave, Cortland, NY, 13045.

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