Michael A. Grassi, MD
Ophthalmology Physician · Naperville, IL
Michael A. Grassi, MD is an ophthalmology physician with a practice address in Naperville, Illinois, and NPI 1689666885, issued on Aug 16, 2005. Check the license (Illinois 036115845, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Michael A. Grassi
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 036115845 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1012 95TH St Ste 9, Naperville, IL 60564
- Phone
- (630) 995-3465
- Enumerated
- Aug 16, 2005
- Record last updated
- Mar 10, 2025
- Fax
- (630) 995-3622
- Medicare enrollment
- Enrolled (PECOS I20070118000429); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1999
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 898 in Illinois → Look up another NPI →
Verify Michael A. Grassi 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 036115845Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average ophthalmology physician in 2024
172 Medicare Part D claims for 53 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Dorzolamide Hcl74 claims
- Prednisolone Acetate25 claims
- Ketorolac Tromethamine16 claims
- Brimonidine Tartrate11 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): 100 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).
Michael A. Grassi among 898 ophthalmology physician records in Illinois
Michael A. Grassi, MD is one of 898 ophthalmology physician records with a practice address in Illinois. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated1999 · median 1999 among the 551 with a school on file
- Record last updated2025 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Illinois
There are 898 ophthalmology physician records in Illinois.
All 898 in Illinois → Every provider in Naperville → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Michael Andreoli, M.D.Naperville, IL 605631083909998
- Michelle Andreoli, MDNaperville, IL 605631437350212
- Sachin Jain, M.D.Naperville, IL 605631275832701
- James Noth, M.D.Westmont, IL 605591013067669
- John Choi, M.D.Warrenville, IL 605551699765230
- Brian Igoe, M.D.Riverside, IL 605461841387826
- Marcos Lopez, M.D.North Riverside, IL 605461417967308
- Kathleen Morno, M.D.North Riverside, IL 605461942247770
Common questions
What is Michael A. Grassi, MD's NPI number?
Michael A. Grassi, MD's National Provider Identifier (NPI) is 1689666885, issued on Aug 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Michael A. Grassi, MD located?
The NPPES record lists a practice address at 1012 95TH St Ste 9, Naperville, IL, 60564. Phone: (630) 995-3465. Providers update this record themselves, so call before visiting.
How can I verify Michael A. Grassi, MD's license?
NPPES lists Illinois license number 036115845, 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 Michael A. Grassi, MD prescribe under Medicare Part D?
In 2024, Michael A. Grassi, MD had 172 Medicare Part D claims for 53 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Michael A. Grassi, MD's MIPS final score?
The 2023 MIPS final score is 100 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.