Summary

Dr. John McMahan treats rhinitis, sinusitis, and chronic sinusitis, and performs CT scans of the head, face, and bones. He practices otolaryngology–head and neck surgery and allergy and immunology and has been in practice for 53 years. He speaks English and Spanish.

Dr. McMahan earned his medical degree from the Medical University of South Carolina College of Medicine and completed his residency at Northwestern Memorial Hospital. He is affiliated with Northwestern Memorial Hospital, UChicago Medicine AdventHealth Hinsdale, Central Maine Medical Center, ThedaCare Regional Medical Center Appleton, Ascension NE Wisconsin Saint Elizabeth Hospital, and Anderson Hospital, and sees patients in San Luis Obispo, California; Vail and Avon, Colorado; Chicago, Hinsdale, and Maryville, Illinois; and Appleton, Wisconsin.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4.2
  • 53 years of experience
  • speaks English, Spanish
  • Northwestern Memorial Hospital
  • 12 written reviews
  • 2 specialties
  • 22 areas of expertise
  • 6 hospital affiliations
  • 7 office locations
  • Male

Patients’ Perspective

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

Office Locations

Dr. John Thomas Mcmahan has 7 locations

Dr. John Thomas Mcmahan

100 Casa St Ste BSan Luis Obispo, CA 93405

Vail Valley Medical Center

180 S Frontage Rd WVail, CO 81657

Colorado Mountain Medical Avon

50 Buck Creek Rd Ste 200Avon, CO 81620
Mon7:30 am - 5:00 pm
Tue7:30 am - 5:00 pm
Wed7:30 am - 5:00 pm
Thu7:30 am - 5:00 pm
Fri7:30 am - 5:00 pm
SatClosed
SunClosed

Anderson Hospital

6800 State Route 162Maryville, IL 62062

Compare with Similar Doctors

Dr. John Thomas Mcmahan, MD
Dr. Robert Stewart
Dr. Roman Platon Bukachevsky, MD
Dr. Ian Blair Murton, MD
Dr. John Thomas Mcmahan, MDDr. Robert StewartDr. Roman Platon Bukachevsky, MDDr. Ian Blair Murton, MD
Otolaryngology-Head & Neck SurgeryOtolaryngology-Head & Neck SurgeryOtolaryngology-Head & Neck SurgeryOtolaryngology-Head & Neck Surgery
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
4.2 
4.3 
4.5 
53 Years of Experience 43 Years of Experience 40 Years of Experience 28 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks English, Spanish Speaks English Speaks English, Spanish
San Luis Obispo , CASan Luis Obispo , CATempleton , CAAtascadero , CA
Med School: Medical University Of South Carolina College Of Medicine Med School: Vanderbilt University School Of Medicine Med School: Rutgers New Jersey Medical School Med School: New York Medical College
Current Profile
View Profile View Profile View Profile

Insurance Plans Accepted by Dr. John Thomas Mcmahan

  • Accepts Medicare

Medical Specialties

Dr. John Thomas Mcmahan has the following 2 specialties

Specialty Expertise

Dr. John Thomas Mcmahan has the following 22 areas of expertise

  • Adolescent Medicine
  • Allergies
  • Allergy
  • Allergy & Immunology
  • Asthma
  • Colposcopy
  • Contraception
  • Desensitization
  • Endoscopy (Endoscopic Surgery)
  • Hay Fever
  • Hay Fever (Seasonal Allergic Rhinitis)
  • Immunotherapy
  • Itching
  • Nasal Allergies
  • Oophoritis (Ovary inflammation)
  • Rash
  • Sino-Nasal Disorders
  • Sinusitis
  • Sleep Apnea (Sleep Apnea Syndromes)
  • Sleep Disorders
  • Snoring
  • Watery Eyes

Certifications, License, & Education

53 Years Experience

Dr. John Thomas Mcmahan holds active and expired medical licenses in the states of Colorado and Illinois.

Medical License

Medical Doctor with an active medical license in the state of Colorado that expires in 2027 and an expired medical license in the state of Illinois that expired in 2026.

Education & Training

Residency

Completed their residency at Northwestern Memorial Hospital.

Medical School

Graduated from Medical University Of South Carolina College Of Medicine in 1973.

NPI Number

Dr. Mcmahan's NPI number is 1518910272.

Similar doctors

Frequently Asked Questions

Does Dr. John Mcmahan accept my insurance?
You can see the insurance plans that Dr. John Mcmahan accepts on their Vitals profile.
Where is Dr. John Mcmahan's office located?
Dr. John Mcmahan's office is located at 100 Casa St Ste B, San Luis Obispo, CA, 93405.
Does Dr. John Mcmahan accept virtual/telehealth appointments?
Dr. John Mcmahan has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Is Dr. John Mcmahan accepting new patients?
Dr. John Mcmahan is accepting new patients on Vitals. View Dr. John Mcmahan's profile on Vitals to make an appointment.
Which hospitals is Dr. John Mcmahan affiliated with?
Dr. John Mcmahan is affiliated with Northwestern Memorial Hospital, Uchicago Medicine Adventhealth Hinsdale, Central Maine Medical Center, Thedacare Regional Medical Center Appleton, Ascension Ne Wisconsin Saint Elizabeth Hospital, and Anderson Hospital.

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.