Mark R. Ottolin, M.D.
Cardiovascular Disease Physician · Naperville, IL
Mark R. Ottolin, M.D. is a cardiovascular disease physician with a practice address in Naperville, Illinois, and NPI 1265525729, issued on Oct 2, 2006. Check the license (Illinois 036-064112, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mark R. Ottolin
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- 036-064112 IL
Self-reported in NPPES; status is on the state search - Practice location
- 100 Spalding Drive, Naperville, IL 60504
- Phone
- (630) 357-4111
- Enumerated
- Oct 2, 2006
- Record last updated
- Sep 24, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (630) 357-4644
- Entity
- Type 1 · individual
Also registered at 100 Spalding Drive
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Ostrenga, M.D.Cardiovascular Disease Physician1801983648
Verify Mark R. Ottolin 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 036-064112Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
215 Medicare Part D claims for 116 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Metoprolol Succinate25 claims
- Atorvastatin Calcium21 claims
- Amlodipine Besylate20 claims
- Rosuvastatin Calcium17 claims
- Warfarin Sodium14 claims
- Losartan Potassium12 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: $14.96
1 payment: food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 16,686 providers of this specialty with any payment received $3,819.56 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.
Cardiovascular Disease Physician providers in Illinois
There are 1,073 cardiovascular disease physician records in Illinois.
Other cardiovascular disease physician records in Illinois
- Nicolaos Abariotis, MDChicago, IL1417996257
- Tahir Abbasi, M.D.Hazel Crest, IL1255495701
- Syed Abdul-Aziz, MDBelleville, IL1114906005
- Pierrot Abi Mansour, MDOak Lawn, IL1285627166
- Ashraf Abourahma, M.D.Oak Lawn, IL1972561975
- Bruce Abramowitz, M.D.,F.A.C.C.Oak Lawn, IL1013918473
- Joseph AdamsPark Ridge, IL1073179594
- Theodore Addai, M.D.Decatur, IL1912985185
- Karima AddetiaChicago, IL1740612993
- Keenan Adib, MDHinsdale, IL1790098804
Common questions
What is Mark R. Ottolin, M.D.'s NPI number?
Mark R. Ottolin, M.D.'s National Provider Identifier (NPI) is 1265525729, issued on Oct 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark R. Ottolin, M.D. located?
The NPPES record lists a practice address at 100 Spalding Drive, Naperville, IL, 60504. Phone: (630) 357-4111. Providers update this record themselves, so call before visiting.
How can I verify Mark R. Ottolin, M.D.'s license?
NPPES lists Illinois license number 036-064112, 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 R. Ottolin, M.D. prescribe under Medicare Part D?
In 2024, Mark R. Ottolin, M.D. had 215 Medicare Part D claims for 116 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. 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.