Important Information
We have moved out of our previous Castle Rock office location. We are currently looking at alternative locations in order to continue serving our valued patients in the Castle Rock area. We will continue to see patients as usual at our current Highlands Ranch office location.

Welcome to Rocky Mountain ENT

For more than 20 years, Rocky Mountain ENT Group has been dedicated to providing comprehensive, caring, and competent medical and surgical treatment for disorders of the head and neck, ears, nose, and throat. We treat both adult and pediatric patients.


Seth A. Reiner, M.D., F.A.C.S.
Jon C. Mills, M.D. View Jon Mills's profile on LinkedIn
Thomas Gonsoulin, M.D., F.A.C.S.
Jackie Smith, Au.D.

Prepare for Your Visit - Click Here

Surgery Information - Click Here

Specializing In:

  • Pediatric and Adult Ear, Nose and Throat Care
  • Tonsil and Adenoid Disease
  • Problems Breathing Through the Nose
  • Sinus Infections and Polyps
  • Lumps and Bumps in the Neck
  • Thyroid and Parathyroid Surgery
  • Recurring Ear Infections or Fluid in the Ears
  • Hole in the Ear Drum
  • Comprehensive Hearing Evaluations
  • The Latest in Digital Hearing Aid Technology
  • Facial Trauma
  • Sleep Apnea and Sleep-Related Disorders
  • Facial Skin Cancers and Reconstruction
  • Cancer of the Throat, Voice Box, and Head and Neck
  • Voice and Swallowing Problems

Twitter Feed @RockyMtnENT

What's New?

Jackie Smith, Au.D.

Come Ring in the New Year with Our New Audiologist

Jackie recently joined Rocky Mountain Ear Nose and Throat as our Chief Audiologist. She is a highly trained audiologist who graduated from the University of Colorado and obtained her doctorate degree in audiology at the University of Northern Colorado. She has a tremendous amount of experience at diagnostic testing and extensive knowledge of hearing aids. Jackie is very excited to be a part of our team and we would love for you to come meet her!

Come join us January 15th or 16th to begin a healthier path towards hearing and enjoy some baked goods and refreshments. It's a new year, a time to start fresh and take a hold of your hearing health!

Call us today at 303-795-5587 to reserve your place!

Register for the Patient Portal

We have established a patient portal, where our patients will be able to securely access certain records, including test results. You can also use the portal to schedule appointments online. Even if you are new to our practice, you can still register online and schedule your appointment.

Tired of Sinus Problems?

See how a new procedure, Balloon Sinus Dilation, also known as "Balloon Sinuplasty," can help break the sinusitis cycle! The procedure can be performed quickly in the office, without general anesthesia, offers a fast recovery, is safe, and is clinically effective.
Hearing Aid

Do you suffer from hearing loss?

Is it time to get your hearing tested? Click below to take a quick, free online test to see if it's time for you to consider a visit for your hearing.

Also check out these nice informational resources about hearing aids from the
Better Hearing Institute:
Hearing Aid Guide Hearing Aid Guide Hearing Aid Guide
Your Guide to Hearing Aids Your Guide to Buying Hearing Aids Your Guide to Care and Maintenance of Hearing Aids