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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. John Allendorf:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (9)

The overall average patient rating of Dr. John Allendorf is Good. Dr. Allendorf has been reviewed by 23 patients who have provided 9 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 3.8
Promptness 3.0
Courteous Staff 3.6
Accurate Diagnosis 3.8
Bedside Manner 3.4
Spends Time with Me 3.2
Follows Up After Visit 3.3

Specialties & Research

Dr. John Allendorf, MD is board certified in Surgery.

  • He has special expertise in 20 areas:
  • Colectomy
  • Endocrine Disorders
  • Endocrine Gland Cancer
  • Gastrointestinal Cancer
  • Gastrointestinal Surgery
  • Hyperparathyroidism
  • Hyperthyroidism
  • Laparoscopic Gallbladder Surgery (Cholecystectomy)
  • Laproscopic Surgery (Laparoscopy)
  • Liver Diseases
  • Mammary Cancer (Experimental)
  • Neoplasm Seeding
  • Pancreatectomy (Pancreas Removal)
  • Pancreatic Cancer
  • Pancreatic Diseases
  • Pheochromocytoma
  • Skin Cancer (Experimental Melanoma)
  • Thyroid Cancer
  • Thyroid Diseases
  • Thyroid Nodule

Education & Awards

Dr. Allendorf graduated from Columbia University, New York. He has 4 awards.

One of America's Leading Experts on:
Castle Connolly Top Doctors: New York Metro Area™ (2015)
Patients' Choice Award (2010)
Top 10 Doctor - Neighborhood (2014)
Washington Heights


Dr. Allendorf has 1 hospital affiliations:

  • Winthrop University Hospital 


  • Russian
  • Spanish
  • English

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Additional Information
Dr. John D Allendorf MD is a male Surgeon, has 15 years of experience and practices in Surgery.
Where does Dr. John D. Allendorf practice?
Dr. John Allendorf has 1 office location.
Dr. John Allendorf practices Surgery near Patchogue, NY.
See Patchogue Surgeons.