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

Demi Louise O'Brien, MD

Individual provider Family Medicine Physician · NPI 1700409828

Demi Louise O'Brien, MD is a Family Practice in Greenfield, Iowa. Qualified in 2020, 6 years ago. Practices with Greater Regional Medical Center, a 48-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
6
Licensed in
IA
In the registry since
2020
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

288 Public Sq
Greenfield, IA 50849-1264
Phone: (641) 743-6529
Fax: (641) 743-8223
Show map & directions

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

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MD-50804 (IA)

Record details

NPI number1700409828
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 22, 2020
Last updated in NPPESFebruary 17, 2025
Certification dateFebruary 17, 2025

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Group practice Greater Regional Medical Center — 48 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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