William Larsen
Medical Physician Assistant · Elk Grove Village, IL
William Larsen is a medical physician assistant with a practice address in Elk Grove Village, Illinois, and NPI 1356711584, issued on Sep 30, 2015. Check the license (Illinois 085005642, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Larsen
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- 085005642 IL
Self-reported in NPPES; status is on the state search - Practice location
- 800 Biesterfield RD, Elk Grove Village, IL 60007
- Phone
- (847) 437-5500
- Enumerated
- Sep 30, 2015
- Record last updated
- Sep 27, 2024
- Medicare enrollment
- Enrolled (PECOS I20151118000758); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 671 in Illinois → Look up another NPI →
Also registered at 800 Biesterfield RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Susan Abbinanti, PA-CPhysician Assistant1679647358
- Dennis Abella, DOInternal Medicine Physician1962498451
- Vanita Achar, MS,RD,LDN,CDE,CNSDRegistered Dietitian1104033810
- Gregory Adamo, M.D.Diagnostic Radiology Physician1790712347
- Maria Agopian, NPAcute Care Nurse Practitioner1235407735
- Bruce Bank, M.D.Hematology & Oncology Physician1225099823
Verify William Larsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 085005642Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average medical physician assistant in 2024
54 Medicare Part D claims for 28 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. 21 claims were for opioids.
Most prescribed
- Oxycodone Hcl14 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 2 group practices
- Bonaventure Medical Foundation LLCHoffman Estates, IL
- University OF ChicagoChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Larsen among 671 medical physician assistant records in Illinois
William Larsen is one of 671 medical physician assistant records with a practice address in Illinois. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 67% of them.
- NPI issued2015 · 67% of these records are older, 29% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2015 · median 2012 among the 340 with a school on file
- Record last updated2024 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Physician Assistant providers in Illinois
There are 671 medical physician assistant records in Illinois.
All 671 in Illinois → Every provider in Elk Grove Village → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Kate FontanaElk Grove Village, IL 600071306172754
- Glenn Garafolo, P.A.-C.Elk Grove Village, IL 600071386789261
- Shannon Holland, PA-CElk Grove Village, IL 600071295762821
- Kristine Nicoletto, PA-CElk Grove Village, IL 600071497721971
- Amenah Basith, PA-CRolling Meadows, IL 600081124820956
- David Bakker, PA-CArlington Heights, IL 600051710998737
- Christine Bialko, PA-CArlington Heights, IL 600051871509927
- Allison Corro, P.A.Arlington Heights, IL 600051093026684
Common questions
What is William Larsen's NPI number?
William Larsen's National Provider Identifier (NPI) is 1356711584, issued on Sep 30, 2015. An NPI identifies a provider in billing; it is not a license.
Where is William Larsen located?
The NPPES record lists a practice address at 800 Biesterfield RD, Elk Grove Village, IL, 60007. Phone: (847) 437-5500. Providers update this record themselves, so call before visiting.
How can I verify William Larsen's license?
NPPES lists Illinois license number 085005642, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does William Larsen prescribe under Medicare Part D?
In 2024, William Larsen had 54 Medicare Part D claims for 28 beneficiaries; the average among medical physician assistant prescribers was 1,148. 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.