Margaret Ann Day, M.D.
Family Medicine Physician · Columbia, MO
Margaret Ann Day, M.D. is a family medicine physician with a practice address in Columbia, Missouri, and NPI 1619139979, issued on Jun 27, 2008. Check the license (Missouri 2011002937, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Margaret Ann Day
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 2011002937 MO
Self-reported in NPPES; status is on the state search - Practice location
- 303 N Keene St Ste 301, Columbia, MO 65201
- Phone
- (573) 882-8000
- Enumerated
- Jun 27, 2008
- Record last updated
- Mar 1, 2023
- Fax
- (573) 882-6600
- Medicare enrollment
- Enrolled (PECOS I20110811000715); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Columbia School Of Medicine, 2008
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,991 in Missouri → Look up another NPI →
Also registered at 303 N Keene St Ste 301
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Peter Koopman, MDFamily Medicine Physician1376526913
- Nicholas Lefevre, M.D.Family Medicine Physician1003255845
- Whitney Lefevre, MDFamily Medicine Physician1902245731
- Natalie Long, M.D.Family Medicine Physician1942562897
- Jennifer Polniak, R.D., C.D.E, PA-CPhysician Assistant1710192588
Verify Margaret Ann Day in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2011002937Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
48% more Medicare Part D claims than the average family medicine physician in 2024
5,231 Medicare Part D claims for 272 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 317 claims were for opioids.
Most prescribed
- Atorvastatin Calcium223 claims
- Levothyroxine Sodium221 claims
- Omeprazole194 claims
- Lisinopril189 claims
- Amlodipine Besylate163 claims
- Hydrochlorothiazide144 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- The Curators OF The University OF MissouriColumbia, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Ann Day among 2,991 family medicine physician records in Missouri
Margaret Ann Day, M.D. is one of 2,991 family medicine physician records with a practice address in Missouri. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 56% of them.
- NPI issued2008 · 56% of these records are older, 42% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2008 · median 2006 among the 1,778 with a school on file
- Record last updated2023 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
195 family medicine physician records list a practice address in Columbia
They are 195 of the 6,004 NPPES records with a practice address in Columbia, and 2,991 family medicine physician records in Missouri.
All 2,991 in Missouri → Every provider in Columbia → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Jeffery Belden, MDColumbia, MO 652011871551739
- Kathleen David, M.D.Columbia, MO 652011992796577
- Bridget Early, M.D.Columbia, MO 652011710968201
- Anne Fitzsimmons, MDColumbia, MO 652011629036561
- Justin Jones, M.D.Columbia, MO 652011962488536
- Scott Kinkade, M.D.Columbia, MO 652011508825894
- Peter Koopman, MDColumbia, MO 652011376526913
- Michael Lefevre, MDColumbia, MO 652011962460055
Common questions
What is Margaret Ann Day, M.D.'s NPI number?
Margaret Ann Day, M.D.'s National Provider Identifier (NPI) is 1619139979, issued on Jun 27, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Ann Day, M.D. located?
The NPPES record lists a practice address at 303 N Keene St Ste 301, Columbia, MO, 65201. Phone: (573) 882-8000. Providers update this record themselves, so call before visiting.
How can I verify Margaret Ann Day, M.D.'s license?
NPPES lists Missouri license number 2011002937, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Margaret Ann Day, M.D. prescribe under Medicare Part D?
In 2024, Margaret Ann Day, M.D. had 5,231 Medicare Part D claims for 272 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Margaret Ann Day, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.