Robert Alter, M.D.
Internal Medicine Physician · Chicago, IL
Robert Alter, M.D. is an 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 Alter
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 2545 S King Dr, Chicago, IL 60616
- Phone
- (312) 842-7117
- Enumerated
- Feb 23, 2006
- Entity
- Type 1 · individual
Also registered at 2545 S King Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Robert 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
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
53 Medicare Part D claims, against an average of 2,785 among the 127,794 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.
3,291 internal medicine physician records list a Chicago practice address
They are 3,291 of the 63,379 NPPES records with a Chicago practice address, and 8,522 internal medicine physician records in Illinois.
All 3,291 in Chicago → All 8,522 in Illinois → Every provider in Chicago →
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- Misha Abbasi, MDChicago, IL1770111635
Common questions
What is Robert Alter, M.D.'s NPI number?
Robert 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 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 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 Alter, M.D. prescribe under Medicare Part D?
In 2024, Robert Alter, M.D. had 53 Medicare Part D claims; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.