Ear, Nose & Throat Surgeon

Gregory K. Sewall, MD


  • Otolaryngology - Ear, Nose and Throat
  • Board Certified by the American Board of Otolaryngology - Head and Neck Surgery
  • M.D. Doctor of Medicine
  • Treating Pediatric and Adult Patients

Treating All Problems of the Head and Neck:

  • Sinus and Nasal
  • Hearing Loss
  • Tinnitus
  • Ear Reconstruction
  • Facial Trauma
  • BAHA (Bone Anchored Hearing Aids)
  • Eustachian Tube Dysfunction
  • Ear Infections
  • Thyroid and Salivary Gland Masses
  • Snoring and Obstructive Sleep Apnea
  • Cancer of the Head and Neck
  • Hoarseness & Voice Disorders


Professional Education and Practice Experience

A native of Fond du Lac, Wisconsin, Dr Sewall graduated from the Medical College of Wisconsin Medical School in 1999 and completed Otolaryngology residency at the University of Wisconsin Hospitals and Clinics in 2005. He is board certified by the American Board of Otolaryngology.

  • 1999 Medical School: Medical College of Wisconsin
  • 2000 Internship: Department of Family Medicine, University of Wisconsin Medical School
  • 2001 Research Fellowship: University of Wisconsin Department of Surgery
  • 2005 Residency Otolaryngology: University of Wisconsin Hospitals and Clinics
  • 2006 ENT & Allergy Associates

Professional Memberships and Affiliations

  • American Academy of Otolaryngology Head and Neck Surgery - Member
  • Wisconsin Medical Society
  • Aspirus Wausau Hospital
  • Wausau Surgery Center
  • Aspirus Medford Hospital & Clinics, Inc.


Dr. Sewall appointments locations:

ENT & Allergy Associates
512 S 28th Ave.
Wausau, WI 54401

Aspirus Medford Hospital & Clinics
135 South Gibson St.
Medford, WI 54451

Call to schedule an appointment:


Communicate with your provider at MyAspirus.org

Ask non-urgent medical questions, request a prescription refill or request an appointment. Questions will be answered within the next business day.