Summary

Dr. John Mcmahan specializes in otolaryngology-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 at Northwestern Memorial Hospital. With 53 years of clinical experience, Dr. Mcmahan brings extensive knowledge to his practice. He is fluent in both Spanish and English.

Dr. Mcmahan practices at multiple locations including Northwestern Memorial Hospital, University of Chicago Medicine AdventHealth Hinsdale, and facilities in San Luis Obispo, California and Vail, Colorado. His expertise includes treating conditions such as deviated nasal septum, sinusitis, and chronic sinusitis. He performs various diagnostic procedures including CT scans of the head, face, and bones. Patients rate Dr. Mcmahan 4.2 out of 5 stars on Vitals.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4.2
  • 53 years of experience
  • speaks Spanish, English
  • 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

Anderson Hospital

6800 State Route 162Maryville, IL 62062

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Dr. John Thomas Mcmahan, MDDr. Shields B Abernathy, MDDr. Michael Alan Matus, MDDr. Stephen Gerard Shaw, MD
Otolaryngology-Head & Neck SurgeryAllergy & ImmunologyOtolaryngology-Head & Neck SurgeryInternal Medicine
Accepts New Patients Accepts New Patients
4.2 
3.4 
53 Years of Experience 47 Years of Experience 56 Years of Experience 32 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks Spanish, English Speaks English, Spanish
San Luis Obispo , CATempleton , CANipomo , CAAtascadero , CA
Med School: Medical University Of South Carolina College Of Medicine Med School: Medical College Of Pennsylvania Med School: Hahnemann University School Of Medicine Med School: University Of Mississippi School Of Medicine
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 an active medical license in the states of Illinois and Colorado.

Medical License

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

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.
What languages does Dr. John Mcmahan speak?
Dr. John Mcmahan speaks Spanish and English.
How can I make an appointment with Dr. John Mcmahan?
You can find contact information for Dr. John Mcmahan here on Vitals.
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.

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