Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Gregory K Sewall, MD

Individual provider Otolaryngology Physician · NPI 1336195023

Gregory K Sewall, MD is an Otolaryngology in Wausau, Wisconsin. Graduated from Medical College of Wisconsin in 1999, 27 years ago. Practices with ENT and Allergy Associates SC, a 25-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
27
Trained at
Medical College of Wisconsin
Licensed in
WI
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

512 S 28th Ave
Wausau, WI 54401-4147
Phone: (715) 847-2021
Fax: (715) 847-2325
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Otolaryngology Physician (primary) Taxonomy 207Y00000X · Licence 42332-020 (WI)

Record details

NPI number1336195023
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 25, 2006
Last updated in NPPESApril 13, 2020
Certification dateApril 13, 2020
Mailing address512 S 28th Ave, Wausau, WI 54401-4147

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOTOLARYNGOLOGY
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 1999 (27 years in practice)
Group practice Ent And Allergy Associates Sc — 25 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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