Summary

Dr. John Mcmahan is a board-certified otolaryngologist specializing in head and neck surgery with additional expertise in allergy and immunology. He earned his medical degree from the Medical University of South Carolina College of Medicine and completed his residency training at Northwestern Memorial Hospital. With over five decades of clinical experience since beginning his practice, Dr. Mcmahan brings extensive knowledge to treating conditions affecting the ears, nose, throat, and related allergic disorders. He is fluent in both English and Spanish.

Dr. Mcmahan practices at multiple locations including San Luis Obispo, California, Vail and Avon, Colorado, Chicago and Hinsdale, Illinois, Maryville, Illinois, and Appleton, Wisconsin. His clinical expertise focuses on treating rhinitis, sinusitis, and chronic sinusitis. He performs specialized diagnostic procedures including CT scans, particularly CT imaging of the head, face, and bones to help diagnose and treat complex sinus and head conditions. Patients rate Dr. Mcmahan 4.2 out of 5 stars on Vitals for his comprehensive care approach.
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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
  • 2 board certifications
  • 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

Northwestern Memorial Hospital

251 E Huron StChicago, IL 60611

Anderson Hospital

6800 State Route 162Maryville, IL 62062

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Dr. John Thomas Mcmahan, MD
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Dr. John Thomas Mcmahan, MDDr. Richard F Busch, MDDr. Jeanne Lynette Shepherd, MDDr. Raymund James Llaurado, MD
Otolaryngology-Head & Neck SurgeryPlastic SurgeryOtolaryngology-Head & Neck SurgeryOtolaryngology-Head & Neck Surgery
Accepts New Patients Accepts New Patients
4.2 
4.3 
3 
3.7 
53 Years of Experience 48 Years of Experience 42 Years of Experience 32 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 , CABakersfield , CAFontana , CASanta Maria , CA
Med School: Medical University Of South Carolina College Of Medicine Med School: Jacobs School Of Medicine & Biomedical Sciences At The Univ Of Buffalo Med School: Keck School Of Medicine Of The University Of Southern California Med School: Medical College Of Wisconsin
Current Profile
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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.

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Frequently Asked Questions

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.
How can I make an appointment with Dr. John Mcmahan?
You can find contact information for Dr. John Mcmahan here on Vitals.
Does Dr. John Mcmahan accept my insurance?
You can see the insurance plans that Dr. John Mcmahan accepts on their Vitals profile.
What languages does Dr. John Mcmahan speak?
Dr. John Mcmahan speaks English and Spanish.

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