Summary

Dr. John Allendorf is an endocrinologist specializing in diabetes and metabolism with nearly three decades of clinical experience. He earned his medical degree from Columbia University College of Physicians and Surgeons, building expertise in hormonal disorders and metabolic conditions. Dr. Allendorf speaks both English and Spanish, helping him connect with a diverse patient population.

Dr. Allendorf practices at NYU Langone Hospital Long Island and sees patients in Mineola, New York. He treats complex conditions including ampullary cancer and cholangiocarcinoma. His surgical expertise includes adrenal surgery and gallbladder procedures, as well as specialized treatments like hyperthermic intraperitoneal chemotherapy for certain cancers. Patients rate Dr. Allendorf 3.9 out of 5 stars on average.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 3.9
  • 29 years of experience
  • 5 insurance plans accepted
  • speaks English, Spanish
  • Columbia University College Of Physicians & Surgeons
  • 12 written reviews
  • 2 specialties
  • 22 areas of expertise
  • 3 board certifications
  • 1 hospital affiliation
  • 1 office location
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Location

Compare with Similar Doctors

John D. Allendorf, MD
Dr. Tamar Reisman, MD
Dr. Robert Jeffrey Silver, MD
Dr. Brian D. Schwartz, MD
John D. Allendorf, MDDr. Tamar Reisman, MDDr. Robert Jeffrey Silver, MDDr. Brian D. Schwartz, MD
Endocrinology, Diabetes & MetabolismEndocrinology, Diabetes & MetabolismEndocrinology, Diabetes & MetabolismEndocrinology, Diabetes & Metabolism
Accepts New Patients Accepts New Patients Accepts New Patients
3.9 
3.2 
3.4 
29 Years of Experience 15 Years of Experience 27 Years of Experience 33 Years of Experience
No Virtual Visit Option Virtual Visit Available No Virtual Visit Option Virtual Visit Available
Speaks English, Spanish Speaks English Speaks English Speaks English
Mineola , NYNew York , NYBrooklyn , NYNew York , NY
Med School: Columbia University College Of Physicians & Surgeons Med School: Rutgers New Jersey Medical School Med School: Rutgers New Jersey Medical School Med School: New York University
Current Profile
View Profile View Profile View Profile

Insurance Plans Accepted by John D. Allendorf

  • Accepts Medicare
  • Aetna HMO
  • Aetna Indemnity
  • Aetna Medicare
  • Local 1199 - NYU Hospital Member Choice
  • Local 1199 PPO

Medical Specialties

John D. Allendorf has the following 2 specialties

Specialty Expertise

John D. Allendorf has the following 22 areas of expertise

  • Colectomy
  • Endocrine Disorders
  • Endocrine Gland Cancer
  • Endocrinology & Metabolism
  • 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)
  • Surgery
  • Thyroid Cancer
  • Thyroid Diseases
  • Thyroid Nodule

Certifications, License, & Education

29 Years Experience

John D. Allendorf 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

Medical School

Graduated from Columbia University College Of Physicians & Surgeons in 1997.

NPI Number

John D. Allendorf's NPI number is 1740364397.

Similar doctors

Frequently Asked Questions

Does John Allendorf accept my insurance?
You can see the insurance plans that John Allendorf accepts on their Vitals profile.
Where is John Allendorf's office located?
John Allendorf's office is located at 120 Mineola Blvd Ste 320, Mineola, NY, 11501.
Is John Allendorf accepting new patients?
John Allendorf is accepting new patients on Vitals. View John Allendorf's profile on Vitals to make an appointment.
What languages does John Allendorf speak?
John Allendorf speaks English and Spanish.
Which hospitals is John Allendorf affiliated with?
John Allendorf is affiliated with Nyu Langone Hospital Long Island.

Ensuring Data Transparency and Trust: A Guide to Vitals Doctor Listings and Reviews

Our provider data is gathered directly from physicians and publicly available databases. Providers who verify their profiles gain the ability to update information, offering additional details about their specialties,education, treated conditions, performed procedures, and accepted insurances.

Reviews on Vitals are submitted by users only. Recognizing the valuable insights these reviews offer into a doctor's reputation, we maintain internal policies and protocols to ensure the quality and accuracy of all reviews. Importantly, providers cannot delete or alter reviews independently. Reviews can only be deleted or changed following an internal assessment by our customer service team.

Your feedback is highly valued and we encourage you to contact our support team should you encounter any issues.