Exp Biol Med (Maywood)
Fovea CentralisOphthalmoscopyTomography, Optical Coherence
Dr. Michael A. Grassi, MD
NPI1689666885PAC ID3678579711
- Medicare services, 2024
- 7,917
- Medicare patients, 2024
- 441
- Part D claims, 2024
- 172
- Publications
- 24
- MIPS score, 2024
- 100
- Practice address
- 801 South Washington, Naperville, IL 60540
- Practice phone
- Call (630) 527-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Michael A. Grassi is a retina specialist (ophthalmology) physician in Naperville, Illinois
Dr. Grassi practices at Edward Hospital in Naperville, Illinois, part of Endeavor Health.
Dr. Grassi's NPI, 1689666885, was assigned on August 16, 2005. Dr. Grassi graduated from Northwestern University Feinberg Medical School in 1999. Dr. Grassi holds Illinois license 036115845.
NPI and contact details
- NPI
- 1689666885NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3678579711
- NPI enumeration date
- August 16, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (630) 527-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael A. Grassi practices at Edward Hospital in Naperville, Illinois
Dr. Grassi's primary practice is Edward Hospital, at 801 South Washington, Naperville, IL 60540 in Du Page County. The practice phone is (630) 527-3000.
- Edward Hospital801 South Washington, Naperville, IL 60540 · Du Page CountyPhone(630) 527-3000
Source: Dmand AI Affiliation Data
Dr. Michael A. Grassi is affiliated with 2 sites of care and 1 medical group
Dr. Grassi's primary practice is Edward Hospital in Naperville, Illinois, part of Endeavor Health. The medical group on file is University of Illinois Physicians Group (UIPG). Dmand AI also links Dr. Grassi to 1 more physician office, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael A. Grassi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grassi practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Edward Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael A. Grassi is one of 67 retina specialist (ophthalmology) physicians in Illinois
Retina specialist is Dr. Grassi's primary specialty in the NPI Registry, under taxonomy code 207WX0107X. Dr. Grassi is licensed in Illinois.
Specialties and state licenses
- Retina specialist (ophthalmology), IllinoisPrimary
Retina specialist (ophthalmology) physicians near Dr. Grassi
Counts of retina specialist (ophthalmology) physicians with a Dmand AI profile, by place and practice. Each opens the list.
67retina specialist (ophthalmology) physicians in Illinois
2retina specialist (ophthalmology) physicians in Naperville
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael A. Grassi billed Medicare for 7,917 services in 2024
CMS data shows 7,917 Medicare services from Dr. Grassi across 21 procedure codes in 2024, for 441 Medicare patients. Medicare paid $1,705,502 for them. Every service was in an office.
Medicare services, 20247,917
Medicare patients441
Paid by Medicare$1.7M
Procedure codes21
Dr. Grassi's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 3,7562024: 3,5336%
- Drugs given in the office
- 2023: 1,9832024: 2,21412%
- Surgery
- 2023: 1,1382024: 1,02110%
- Office and hospital visits
- 2023: 7262024: 7858%
- Imaging
- 2023: 4102024: 36411%
Dr. Grassi compared with the Illinois median for retina specialist (ophthalmology) physicians, 2024
- Dr. Grassi
- Illinois median
- Medicare services
- 7,917vs 15,73150% below
- Medicare patients
- 441vs 71038% below
- Part D claims
- 126vs 23145% below
Medians across 68 retina specialist (ophthalmology) physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Grassi's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Grassi and other retina specialist (ophthalmology) physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael A. Grassi treated 441 Medicare patients in 2024, average age 75
CMS counts 441 Medicare patients who saw Dr. Grassi in 2024. The largest group is 65 to 74, with 200 patients. 75% of them have high cholesterol, and 73% have high blood pressure. 7% are also on Medicaid. Their average risk score is 1.27, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Grassi's median patient age at 65, with 52% women.
Medicare patients, 2024441
Average age75
Average risk score1.27
Also on Medicaid7%
Dr. Grassi's Medicare patients by age, 2024
Dr. Grassi's Medicare patients by sex, 2024
- Women26159%
- Men18041%
Chronic conditions among Dr. Grassi's Medicare patients, 2024
- High cholesterol75%
- High blood pressure73%
- Arthritis44%
- Diabetes37%
- Ischemic heart disease27%
- Chronic kidney disease23%
- Osteoporosis19%
- Mood disorders18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Grassi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women52%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Michael A. Grassi wrote 172 Medicare Part D claims in 2024
In 2024, Dr. Grassi wrote 172 Medicare Part D claims for 53 patients. 78% of them were for generic drugs. CMS names the drug for 126 of them, across 4 drugs with 11 or more claims each, at $3,504 in total drug cost. In 2023, CMS named 114 claims across 4 drugs.
Part D claims, 2024172
Drugs named by CMS4
Total drug cost$3,504
Part D patients53
Dr. Grassi's Part D claims by kind of drug, 2024
- Generic134 claims78%
- Brand-name38 claims22%
Dr. Grassi's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1142024: 12611%
Drugs named by CMS: 4 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Michael A. Grassi scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Grassi for performance year 2024, reported individually. Dr. Grassi accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Grassi's MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Michael A. Grassi has 24 publications on record
Dmand AI links 24 papers to Dr. Grassi, published from 2011 to 2021. 2018 was the busiest year, with 4. The most frequent topics are Electroretinography, Diabetic Retinopathy and Tomography, Optical Coherence. Dr. Grassi has published most often in Doc Ophthalmol. Dr. Grassi's most frequent co-authors are Vidhya Rao, MD, Jalees Rehman, MD and Hasenin Raid Hashim Al-Khersan, MD.
Papers24
Years published2011 to 2021
Dr. Grassi's papers by year, 2012 to 2021
Topics Dr. Grassi writes about most
- Electroretinography
- Diabetic Retinopathy
- Tomography, Optical Coherence
- Diabetes Mellitus, Type 1
- Genetic Predisposition to Disease
- Membrane Proteins
- Photoreceptor Cells, Vertebrate
- Genetic Testing
Dr. Grassi's most frequent co-authors
- Vidhya Rao, MD3 shared papers
- Jalees Rehman, MD3 shared papers
- Hasenin Raid Hashim Al-Khersan, MD2 shared papers
Recent publications by Dr. Grassi
Doc Ophthalmol
ElectroretinographyEye ProteinsMacular Degeneration
Cell Line, TransformedDiabetes Mellitus, Type 1Diabetic Retinopathy
Doc Ophthalmol
Anti-Bacterial AgentsAutoimmune DiseasesElectroretinography
See who Dr. Grassi researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Grassi works with, so you can find a warm path to the right retina specialist (ophthalmology) physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Michael A. Grassi received $47 in industry payments in 2022
CMS Open Payments shows 1 general payment to Dr. Grassi from 1 drug or device company in 2022. Education make up the largest share, 100% of the total. Genentech, Inc. paid the most, $47.
Companies that paid Dr. Grassi the most, 2022 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael A. Grassi graduated from Northwestern University Feinberg Medical School
Dr. Grassi graduated from Northwestern University Feinberg Medical School in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Michael A. Grassi's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Michael A. Grassi
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Michael A. Grassi's NPI number?
Dr. Michael A. Grassi's NPI number is 1689666885. It was assigned on August 16, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael A. Grassi?
Dr. Michael A. Grassi is a retina specialist (ophthalmology) physician in Naperville, Illinois. The primary specialty in the NPI Registry is Retina Specialist (Ophthalmology) Physician (taxonomy code 207WX0107X).
Where does Dr. Michael A. Grassi practice?
Dr. Grassi practices at 801 South Washington, Naperville, IL 60540. Dr. Grassi's primary practice is Edward Hospital in Naperville, Illinois, part of Endeavor Health. Dmand AI also links Dr. Grassi to 1 physician office.
What is Dr. Michael A. Grassi's office phone number?
The practice phone on file for Dr. Grassi is (630) 527-3000.
What is Dr. Michael A. Grassi's medical license number?
Dr. Grassi holds Illinois license 036115845.
Which hospitals is Dr. Michael A. Grassi affiliated with?
Dr. Grassi practices at Edward Hospital in Naperville, Illinois.
What medical group is Dr. Michael A. Grassi part of?
Dr. Grassi is linked to University of Illinois Physicians Group (UIPG).
Does Dr. Michael A. Grassi accept Medicare?
Yes. CMS data shows Dr. Grassi billed Medicare for 7,917 services in 2024, and Dr. Grassi accepts Medicare assignment.
What is Dr. Michael A. Grassi's MIPS score?
Dr. Grassi's MIPS final score for performance year 2024 is 100 out of 100, reported individually.
How many Medicare patients does Dr. Michael A. Grassi see?
CMS counts 441 Medicare patients who saw Dr. Grassi in 2024, with an average age of 75.
Show 7 more questionsShow fewer questions
What services does Dr. Michael A. Grassi bill to Medicare?
In 2024, Dr. Grassi's most billed Medicare services were injected or infused drug (J0178), eye exam or test (92134) and surgery: eye (67028).
Where did Dr. Michael A. Grassi go to medical school?
Dr. Grassi graduated from Northwestern University Feinberg Medical School in 1999.
What drugs does Dr. Michael A. Grassi prescribe most?
In 2024 Medicare Part D data, Dr. Grassi's most prescribed drugs by claims were Dorzolamide HCl, Prednisolone Acetate and Ketorolac Tromethamine.
Has Dr. Michael A. Grassi received payments from drug or device companies?
CMS Open Payments shows $47 in general payments to Dr. Grassi from 1 company from 2022 to 2022. The largest total came from Genentech, Inc.
How long has Dr. Michael A. Grassi been practicing?
Dr. Grassi graduated from medical school in 1999, 27 years ago.
Does Dr. Michael A. Grassi do research?
Dmand AI links 24 publications to Dr. Grassi, published from 2011 to 2021.
Who does Dr. Michael A. Grassi publish with?
Dr. Grassi's most frequent co-authors are Vidhya Rao, MD (3 shared papers), Jalees Rehman, MD (3 shared papers) and Hasenin Raid Hashim Al-Khersan, MD (2 shared papers).
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