Thomas Mark
Physician Assistant · Elgin, IL
Thomas Mark is a physician assistant with a practice address in Elgin, Illinois, and NPI 1255577649, issued on Jan 6, 2009. Check the license (Illinois 085003372, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Thomas Mark
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 085003372 IL
Self-reported in NPPES; status is on the state search - Practice location
- 370 Summit St, Elgin, IL 60120
- Phone
- (847) 608-1344
- Enumerated
- Jan 6, 2009
- Record last updated
- Jan 6, 2009 (not updated in 17 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150306001833); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,926 in Illinois → Look up another NPI →
Also registered at 370 Summit St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Candice Michelle Aphaivong, FNP-BCFamily Nurse Practitioner1124503602
- Nabanita Bhowmick, M.D.Adult Medicine Physician1134398506
- Stephanie Ceisel, LCSWClinical Social Worker1265018055
- Tracy Denne, PAPhysician Assistant1780889006
- Oletha Johnson, NPNurse Practitioner1770788234
- Michelle Krause, APN, FNP-CFamily Nurse Practitioner1376890889
Verify Thomas Mark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 085003372Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6.7 times the Medicare Part D claims of the average physician assistant in 2024
5,564 Medicare Part D claims for 677 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 112 claims were for opioids.
Most prescribed
- Atorvastatin Calcium236 claims
- Levothyroxine Sodium209 claims
- Gabapentin196 claims
- Amlodipine Besylate194 claims
- Albuterol Sulfate Hfa166 claims
- Losartan Potassium159 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 one group practice
- Prime Healthcare Illinois Medical Group LLCJoliet, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas Mark among 4,926 physician assistant records in Illinois
Thomas Mark is one of 4,926 physician assistant records with a practice address in Illinois. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 19% of them.
- NPI issued2009 · 19% of these records are older, 78% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2008 · median 2019 among the 3,407 with a school on file
- Record last updated2009 · 35% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
89 physician assistant records list a practice address in Elgin
They are 89 of the 2,268 NPPES records with a practice address in Elgin, and 4,926 physician assistant records in Illinois.
All 4,926 in Illinois → Every provider in Elgin → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Jennifer Biel, PA-CElgin, IL 601201912336082
- Tracy Denne, PAElgin, IL 601201780889006
- Abigail Dodis, PA-CElgin, IL 601201922723022
- Colleen Friedlein, PA-CElgin, IL 601201184136293
- Tempest Jamison, PA-CElgin, IL 601201801587795
- Merideth LembkeElgin, IL 601201811179195
- Rachel Luettke, PA-CElgin, IL 601201467926204
- Bansi PatelElgin, IL 601201659811818
Common questions
What is Thomas Mark's NPI number?
Thomas Mark's National Provider Identifier (NPI) is 1255577649, issued on Jan 6, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Mark located?
The NPPES record lists a practice address at 370 Summit St, Elgin, IL, 60120. Phone: (847) 608-1344. Providers update this record themselves, so call before visiting.
How can I verify Thomas Mark's license?
NPPES lists Illinois license number 085003372, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Thomas Mark prescribe under Medicare Part D?
In 2024, Thomas Mark had 5,564 Medicare Part D claims for 677 beneficiaries; the average among physician assistant prescribers was 830. 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.