Mark W. Stolar, M.D.
Internal Medicine Physician · Woodstock, IL
Mark W. Stolar, M.D. is an internal medicine physician with a practice address in Woodstock, Illinois, and NPI 1396784591, issued on Jun 5, 2006. Check the license (Illinois 036061561, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mark W. Stolar
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036061561 IL
Self-reported in NPPES; status is on the state search - Practice location
- 3707 Doty RD Ste E&F, Woodstock, IL 60098
- Phone
- (815) 338-6600
- Enumerated
- Jun 5, 2006
- Record last updated
- Mar 18, 2024
- Fax
- (815) 337-1980
- Medicare enrollment
- Enrolled (PECOS I20101119001127); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1979
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 3707 Doty RD Ste E&F
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Erin Davis-Delay, M.D.Internal Medicine Physician1215985387
- Kenneth Tomchik, MDInternal Medicine Physician1629090972
Verify Mark W. Stolar 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 036061561Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.2 times the Medicare Part D claims of the average internal medicine physician in 2024
10,224 Medicare Part D claims for 874 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 357 claims were for opioids.
Most prescribed
- Levothyroxine Sodium516 claims
- Atorvastatin Calcium444 claims
- Rosuvastatin Calcium303 claims
- Amlodipine Besylate298 claims
- Metoprolol Succinate242 claims
- Losartan Potassium199 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.
The MIPS final score for 2023 (Medicare payment program): 94.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Central Dupage Physician GroupWoodstock, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark W. Stolar among 7,238 internal medicine physician records in Illinois
Mark W. Stolar, M.D. 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 fileYes · 50% of these records are
- Graduated1979 · median 2003 among the 3,580 with a school on file
- Record last updated2024 · 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).
6 internal medicine physician records list a practice address in Woodstock
They are 6 of the 511 NPPES records with a practice address in Woodstock, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Woodstock → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Erin Davis-Delay, M.D.Woodstock, IL 600981215985387
- Joseph Emmons, M.D.Woodstock, IL 600981407804586
- Karen Judy Thome, MDWoodstock, IL 600981093763120
- Bibiano Ronquillo, MDWoodstock, IL 600981285791228
- Kenneth Tomchik, MDWoodstock, IL 600981629090972
- Gopal Bhalala, MDZion, IL 600991669473963
- Mohanad Joudeh, M.D.Zion, IL 600991659546414
- Harsha Kaza, MDZion, IL 600991598786436
Common questions
What is Mark W. Stolar, M.D.'s NPI number?
Mark W. Stolar, M.D.'s National Provider Identifier (NPI) is 1396784591, issued on Jun 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark W. Stolar, M.D. located?
The NPPES record lists a practice address at 3707 Doty RD Ste E&F, Woodstock, IL, 60098. Phone: (815) 338-6600. Providers update this record themselves, so call before visiting.
How can I verify Mark W. Stolar, M.D.'s license?
NPPES lists Illinois license number 036061561, 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 Mark W. Stolar, M.D. prescribe under Medicare Part D?
In 2024, Mark W. Stolar, M.D. had 10,224 Medicare Part D claims for 874 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mark W. Stolar, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.