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