William R. Harper, MD
Internal Medicine Physician · Chicago, IL
William R. Harper, MD is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1629131149, issued on Dec 18, 2006. Check the license (Illinois 036097080, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- William R. Harper
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036097080 IL
Self-reported in NPPES; status is on the state search - Practice location
- 737 N Michigan Ave, Chicago, IL 60611
- Phone
- (855) 947-7371
- Enumerated
- Dec 18, 2006
- Record last updated
- Aug 16, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (312) 284-4124
- Medicaid ID
- 036097080 IL
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 737 N Michigan Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William R. Harper in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036097080Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average internal medicine physician in 2024
949 Medicare Part D claims for 77 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium83 claims
- Atorvastatin Calcium51 claims
- Levothyroxine Sodium45 claims
- Bupropion Xl36 claims
- Eliquis26 claims
- Finasteride26 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.
Industry payments in 2024: $13.30
1 payment: food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William R. Harper among 7,238 internal medicine physician records in Illinois
William R. Harper, MD is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2018 · 47% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,867 internal medicine physician records list a practice address in Chicago
They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →
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Common questions
What is William R. Harper, MD's NPI number?
William R. Harper, MD's National Provider Identifier (NPI) is 1629131149, issued on Dec 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William R. Harper, MD located?
The NPPES record lists a practice address at 737 N Michigan Ave, Chicago, IL, 60611. Phone: (855) 947-7371. Providers update this record themselves, so call before visiting.
How can I verify William R. Harper, MD's license?
NPPES lists Illinois license number 036097080, as entered by the provider. 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 William R. Harper, MD prescribe under Medicare Part D?
In 2024, William R. Harper, MD had 949 Medicare Part D claims for 77 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.