Demi Louise O'Brien, MD
Family Medicine Physician · Greenfield, IA
Demi Louise O'Brien, MD is a family medicine physician with a practice address in Greenfield, Iowa, and NPI 1700409828, issued on May 22, 2020. Check the license (Iowa MD-50804, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Demi Louise O'Brien
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD-50804 IA
Self-reported in NPPES; status is on the state search - Practice location
- 288 Public SQ, Greenfield, IA 50849
- Phone
- (641) 743-6529
- Enumerated
- May 22, 2020
- Record last updated
- Feb 17, 2025
- Fax
- (641) 743-8223
- Medicare enrollment
- Enrolled (PECOS I20230525002027); accepts Medicare assignment
- Entity
- Type 1 · individual
Verify Demi Louise O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license MD-50804Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average family medicine physician in 2024
523 Medicare Part D claims for 68 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Atorvastatin Calcium33 claims
- Triamcinolone Acetonide27 claims
- Lisinopril20 claims
- Levothyroxine Sodium17 claims
- Escitalopram Oxalate16 claims
- Omeprazole15 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
One hospital affiliation
- Greater Regional Medical CenterCreston, IA · Critical Access Hospitals3 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
2 family medicine physician records list a practice address in Greenfield
They are 2 of the 31 NPPES records with a practice address in Greenfield, and 2,336 family medicine physician records in Iowa.
All 2 in Greenfield → All 2,336 in Iowa → Every provider in Greenfield →
Other family medicine physician records in Iowa
- Jennifer Aanestad, M.D.Durant, IA1386649341
- Amjad Abdelhady, MDSioux City, IA1033966700
- Afsana Abdullah, D.O.Bettendorf, IA1760583066
- Raja Ali Abdullah, MDCedar Falls, IA1356101000
- Laura Abels, DOAnkeny, IA1427313527
- Matthew AbendrothDes Moines, IA1972918894
- Mabra Abernathy, M.D.Coralville, IA1316922545
- Jennifer Abler, D.O.Altoona, IA1528159068
- Michael Abouassaly, M.D.West Burlington, IA1184790909
- Safa Abukhalil, M.B.B.SWest Des Moines, IA1982084463
Common questions
What is Demi Louise O'Brien, MD's NPI number?
Demi Louise O'Brien, MD's National Provider Identifier (NPI) is 1700409828, issued on May 22, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Demi Louise O'Brien, MD located?
The NPPES record lists a practice address at 288 Public SQ, Greenfield, IA, 50849. Phone: (641) 743-6529. Providers update this record themselves, so call before visiting.
How can I verify Demi Louise O'Brien, MD's license?
NPPES lists Iowa license number MD-50804, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Demi Louise O'Brien, MD prescribe under Medicare Part D?
In 2024, Demi Louise O'Brien, MD had 523 Medicare Part D claims for 68 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.