William R. Greenfield, MD
Family Medicine Physician · Libertyville, IL
William R. Greenfield, MD is a family medicine physician with a practice address in Libertyville, Illinois, and NPI 1740272988, issued on Aug 15, 2005. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- William R. Greenfield
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- Practice location
- 716 S Milwaukee Ave, Libertyville, IL 60048
- Phone
- (847) 362-1393
- Enumerated
- Aug 15, 2005
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (847) 362-3797
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
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Verify William R. Greenfield 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 family medicine physician in 2024
49 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
William R. Greenfield among 6,215 family medicine physician records in Illinois
William R. Greenfield, MD is one of 6,215 family medicine physician records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2007 · 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 207Q00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
28 family medicine physician records list a practice address in Libertyville
They are 28 of the 1,361 NPPES records with a practice address in Libertyville, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in Libertyville → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Charles Colodny, MDLibertyville, IL 600481659363893
- George Elvove, M.D.Libertyville, IL 600481265537393
- Christopher Harris, M.D.Libertyville, IL 600481396742060
- Caroline Koppi, M.D.Libertyville, IL 600481417999061
- Daniel Lynch, M.D.Libertyville, IL 600481477548782
- Nina Maniquis, M.D.Libertyville, IL 600481649212010
- Vina Maria Maniquis, MDLibertyville, IL 600481851497119
- William Martinez, MDLibertyville, IL 600481144212382
Common questions
What is William R. Greenfield, MD's NPI number?
William R. Greenfield, MD's National Provider Identifier (NPI) is 1740272988, issued on Aug 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William R. Greenfield, MD located?
The NPPES record lists a practice address at 716 S Milwaukee Ave, Libertyville, IL, 60048. Phone: (847) 362-1393. Providers update this record themselves, so call before visiting.
How can I verify William R. Greenfield, MD'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 William R. Greenfield, MD prescribe under Medicare Part D?
In 2024, William R. Greenfield, MD had 49 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. 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.