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

William I Parker, MD

Individual provider Emergency Medicine Physician · NPI 1356459903

William I Parker, MD is an Emergency Medicine in Mason City, Iowa. Qualified in 1991, 35 years ago. Practices with Emergency Medicine Services of Fl LLC, a 665-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
35
Licensed in
IA
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

1000 4th St SW Ste ER
Mason City, IA 50401-2800
Phone: (641) 422-7234
Fax: (641) 422-6373
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 28723 (IA)

Record details

NPI number1356459903
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 25, 2006
Last updated in NPPESOctober 11, 2023
Certification dateOctober 11, 2023
Mailing address621 S Illinois Ave, Suite 103, Mason City, IA 50401-5489

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 1991 (35 years in practice)
Group practice Emergency Medicine Services Of Fl Llc — 665 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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