Robert Allan Alter, M.D.
Geriatric Medicine (Internal Medicine) Physician · Chicago, IL
Robert Allan Alter, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Chicago, Illinois, and NPI 1821064585, issued on Feb 23, 2006. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Robert Allan Alter
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- Practice location
- 2545 S King Dr, Chicago, IL 60616
- Phone
- (312) 842-7117
- Enumerated
- Feb 23, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (312) 326-2102
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 179 in Illinois → Look up another NPI →
Also registered at 2545 S King Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Adekonla Adegunsoye, M.D.Internal Medicine Physician1861712903
- Collette Ara Honore, M.D.Dermatology Physician1174636930
- Azmina Bhaiji, M.D.Internal Medicine Physician1487689634
- Kathleen Bienia, PA-C, MMSCPhysician Assistant1144545237
- Adeshola Ezeokoli, MDInternal Medicine Physician1003121922
- David Farnsworth, M.D.Pediatrics Physician1811921976
Verify Robert Allan Alter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
53 Medicare Part D claims, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Omeprazole51 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.
Robert Allan Alter among 179 geriatric medicine (internal medicine) physician records in Illinois
Robert Allan Alter, M.D. is one of 179 geriatric medicine (internal medicine) physician records with a practice address in Illinois. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 40% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileNo · 42% of these records are
- Record last updated2026 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Illinois
There are 179 geriatric medicine (internal medicine) physician records in Illinois.
All 179 in Illinois → Every provider in Chicago → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Vania LeungChicago, IL 606161518351758
- Kanramon Watthanasuntorn, MDChicago, IL 606161952821563
- Geraldine LunaChicago, IL 606171275735706
- Amelia Conte-Russian, M.D.Chicago, IL 606181851338792
- James Fenoglio, MDChicago, IL 606181063690469
- Glenn Harrison, M.D.Chicago, IL 606181316076946
- Nandana Jasti, M.D.Chicago, IL 606181770773871
- Banio Koroma, MDChicago, IL 606181962443739
Common questions
What is Robert Allan Alter, M.D.'s NPI number?
Robert Allan Alter, M.D.'s National Provider Identifier (NPI) is 1821064585, issued on Feb 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Allan Alter, M.D. located?
The NPPES record lists a practice address at 2545 S King Dr, Chicago, IL, 60616. Phone: (312) 842-7117. Providers update this record themselves, so call before visiting.
How can I verify Robert Allan Alter, M.D.'s license?
Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert Allan Alter, M.D. prescribe under Medicare Part D?
In 2024, Robert Allan Alter, M.D. had 53 Medicare Part D claims; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.