Mary S. Maish, MD
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Lake Forest, IL
Mary S. Maish, MD is a thoracic surgery (cardiothoracic vascular surgery) physician with a practice address in Lake Forest, Illinois, and NPI 1750316774, issued on Jul 11, 2006. Check the license (Illinois 036147674, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mary S. Maish
- Credential
- MD
- Primary taxonomy
- Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician 208G00000X
- License numbers
- 036147674 IL
01096488A IN
4301513301 MI
Self-reported in NPPES; status is on the state search - Practice location
- 800 N Westmoreland RD Ste 100, Lake Forest, IL 60045
- Phone
- (224) 271-4650
- Enumerated
- Jul 11, 2006
- Record last updated
- Aug 25, 2025
- Fax
- (224) 234-4336
- Medicaid ID
- 00G868960 CA
- Medicare enrollment
- Enrolled (PECOS I20250620000091); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1999
- Entity
- Type 1 · individual
8 nearest thoracic surgery (cardiothoracic vascular surgery) physician records → All 265 in Illinois → Look up another NPI →
Also registered at 800 N Westmoreland RD Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Daniel Davila, M.D.Surgery Physician1558637124
- Rebecca Litz, APRN, CNPNurse Practitioner1952803033
- Michael McGuire, MDUrology Physician1821018185
- Leslie Mei, PA-CPhysician Assistant1194370445
- Olivia Niepsuj, PA-CPhysician Assistant1245887256
- Hina Omar, MDGastroenterology Physician1972846871
Verify Mary S. Maish 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 036147674Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average thoracic surgery (cardiothoracic vascular surgery) physician in 2024
30 Medicare Part D claims for 15 beneficiaries, against an average of 101 among the 2,587 providers of this specialty who prescribed in Part D.
Most prescribed
- Omeprazole13 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).
Industry payments in 2024: $682.52
13 payments; by number, the most common kind was food and beverage; the largest payer was Atricure, Inc. The 4,047 providers of this specialty with any payment received $7,828.84 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.
3 hospitals and group practices
- Bronson Methodist HospitalKalamazoo, MI · Acute Care Hospitals4 of 5 stars
- Cardiac Surgery Associates SCIndianapolis, IN
- Franciscan Physician NetworkLafayette, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Mary S. Maish among 265 thoracic surgery (cardiothoracic vascular surgery) physician records in Illinois
Mary S. Maish, MD is one of 265 thoracic surgery (cardiothoracic vascular surgery) physician records with a practice address in Illinois. 72% 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 13% of them.
- NPI issued2006 · 13% of these records are older, 56% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated1999 · median 1999 among the 148 with a school on file
- Record last updated2025 · 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 208G00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers in Illinois
There are 265 thoracic surgery (cardiothoracic vascular surgery) physician records in Illinois.
All 265 in Illinois → Every provider in Lake Forest → Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician nationwide →
The 8 thoracic surgery (cardiothoracic vascular surgery) physician records with the nearest ZIP codes
- Robert Kummerer, M.D.Libertyville, IL 600481902891674
- Ruheri Perez-Tamayo, MD,PHDMcHenry, IL 600501881655397
- Aqeel Sandhu, M.D.McHenry, IL 600501922003193
- Lambros Tsonis, M.D.Gurnee, IL 600311356504278
- Charles Brown, M.D.Northbrook, IL 600621225572928
- Katherine Su, M.D.Glenview, IL 600261275951782
- James Torres, M.D.Inverness, IL 600671003178518
- Chawki El Zein, MDPark Ridge, IL 600681497711394
Common questions
What is Mary S. Maish, MD's NPI number?
Mary S. Maish, MD's National Provider Identifier (NPI) is 1750316774, issued on Jul 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary S. Maish, MD located?
The NPPES record lists a practice address at 800 N Westmoreland RD Ste 100, Lake Forest, IL, 60045. Phone: (224) 271-4650. Providers update this record themselves, so call before visiting.
How can I verify Mary S. Maish, MD's license?
NPPES lists Illinois license number 036147674, 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 Mary S. Maish, MD prescribe under Medicare Part D?
In 2024, Mary S. Maish, MD had 30 Medicare Part D claims for 15 beneficiaries; the average among thoracic surgery (cardiothoracic vascular surgery) physician prescribers was 101. Part D covers Medicare prescriptions only.
What is Mary S. Maish, MD'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.