Ruby Ann Marr, MD
Internal Medicine Physician · Ann Arbor, MI
Ruby Ann Marr, MD is an internal medicine physician with a practice address in Ann Arbor, Michigan, and NPI 1952644700, issued on Mar 30, 2013. Check the license (Michigan 4301103598, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Ruby Ann Marr
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 4301103598 MI
5601007173 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1500 E Medical Center Drive, Ann Arbor, MI 48109
- Phone
- (734) 936-5582
- Enumerated
- Mar 30, 2013
- Record last updated
- Jul 21, 2022
- Medicare enrollment
- Enrolled (PECOS I20160725000068); accepts Medicare assignment
- Medical or professional school
- Wayne State University School Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 1500 E Medical Center Drive
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ruby Ann Marr in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301103598Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
55 Medicare Part D claims for 19 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of 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.
Bills Medicare through one group practice
- Regents OF The University OF MichiganAnn Arbor, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ruby Ann Marr among 5,735 internal medicine physician records in Michigan
Ruby Ann Marr, MD is one of 5,735 internal medicine physician records with a practice address in Michigan. 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 2013, is newer than 61% of them.
- NPI issued2013 · 61% of these records are older, 36% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2013 · median 2006 among the 3,564 with a school on file
- Record last updated2022 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
479 internal medicine physician records list a practice address in Ann Arbor
They are 479 of the 15,616 NPPES records with a practice address in Ann Arbor, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Ann Arbor → Internal Medicine Physician nationwide →
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Common questions
What is Ruby Ann Marr, MD's NPI number?
Ruby Ann Marr, MD's National Provider Identifier (NPI) is 1952644700, issued on Mar 30, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Ruby Ann Marr, MD located?
The NPPES record lists a practice address at 1500 E Medical Center Drive, Ann Arbor, MI, 48109. Phone: (734) 936-5582. Providers update this record themselves, so call before visiting.
How can I verify Ruby Ann Marr, MD's license?
NPPES lists Michigan license number 4301103598, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ruby Ann Marr, MD prescribe under Medicare Part D?
In 2024, Ruby Ann Marr, MD had 55 Medicare Part D claims for 19 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.