JOHN NATHAN ALLAN, M.D.
Internal Medicine, Hematology & Oncology

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The complete catalog for Manhattan — every oncology doctor and every matching clinic, with ratings, insurance, and one-tap contact.
1,058
oncologists
35
oncology clinics
Complete catalog — every matching doctor and clinic is here, page by page.
Live directory1–24 of 1,058 doctorsrich profiles with ratings and one-tap contact.
Internal Medicine, Hematology & Oncology
Internal Medicine, Hematology & Oncology
Internal Medicine, Hematology & Oncology
Internal Medicine, Medical Oncology
Office hours today
8:00 AM – 5:00 PM
Business hours at Columbia Orthopedics - NYP/Columbia (this practice address)Internal Medicine, Medical Oncology
Office hours today
Open 24 hours
Business hours at The New York And Presbyterian Hospital (this practice address)Surgery, Surgical Oncology
Obstetrics & Gynecology, Gynecologic Oncology
Office hours today
Open 24 hours
Business hours at Memorial Sloan Kettering Cancer Center (this practice address)Internal Medicine, Hematology & Oncology
Office hours today
9:00 AM – 5:00 PM
Business hours at Icahn School Of Medicine At Mount Sinai (this practice address)Surgery, Surgical Oncology
Internal Medicine, Medical Oncology
Internal Medicine, Hematology & Oncology
Office hours today
9:00 AM – 6:00 PM
Business hours at NYU Department of Neurology (this practice address)Internal Medicine, Medical Oncology
Internal Medicine, Medical Oncology
Internal Medicine, Hematology & Oncology
Internal Medicine, Medical Oncology
Internal Medicine, Medical Oncology
Internal Medicine, Medical Oncology
Internal Medicine, Medical Oncology
Internal Medicine, Hematology & Oncology
Internal Medicine, Hematology & Oncology
Surgery, Surgical Oncology
Office hours today
8:00 AM – 5:00 PM
Business hours at Icahn School Of Medicine At Mount Sinai (this practice address)Surgery, Surgical Oncology
Local comparison guide
This page currently shows 1058 matching profiles from the CareIndex directory. Before scheduling, confirm that the doctor treats your specific concern, accepts your insurance plan, practices at the listed location, and is accepting appointments. Ratings are most useful when read together with the number of reviews—not as a substitute for credentials, fit, or medical judgment.
Check current professional credentials with the relevant New York licensing authority.
Ask both the practice and insurer about network status and likely out-of-pocket costs.
Confirm the address, services, accessibility, hours, and appointment availability.