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

William John McMillan, MD

Individual provider Otolaryngology Physician · NPI 1558454975

William John McMillan, MD is an Otolaryngology Physician in Ottumwa, Iowa. Practices as a sole proprietor. Licensed in Iowa.

Licensed in
IA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1005 Pennsylvania Ave
Ottumwa, IA 52501-6413
Phone: (641) 683-1900
Fax: (641) 683-3830
Show map & directions

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

Specialties & licences

Otolaryngology Physician (primary) Taxonomy 207Y00000X · Licence 20710 (IA)

Record details

NPI number1558454975
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedSeptember 30, 2006
Last updated in NPPESJuly 8, 2007
Mailing address1005 Pennsylvania Ave, Ottumwa, IA 52501-6413