Michael Grassi, MD
NPI 1689666885 · Ophthalmology Physician · Naperville, IL
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Grassi, MD is a Ophthalmology Physician provider in Naperville, IL (NPI 1689666885).
Provider details
- NPI number
- 1689666885
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036115845 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
5,703 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Imaging of Retina92134 | 1,740 | $41 |
| Injection of Drug Into Eye67028 | 1,000 | $134 |
| Exam of Visual Field With Extended Testing92083 | 649 | $63 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 616 | $98 |
| 2d Ultrasound Scan of Eye Tissue and Structures76512 | 364 | $51 |
| Exam of Retinal Blood Vessels Using a Special Camera After Injection of a Dye92235 | 356 | $173 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Dorzolamide Hcl | 74 | 20 |
| Prednisolone Acetate | 25 | 12 |
| Ketorolac Tromethamine | 16 | — |
| Brimonidine Tartrate | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-16
- Last updated
- 2025-03-10
- Certified
- 2025-03-10
Frequently asked questions
- What is Michael Grassi's NPI number?
- Michael Grassi's National Provider Identifier (NPI) is 1689666885, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Grassi's specialty?
- Michael Grassi is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Grassi located?
- Michael Grassi's practice location on file with NPPES is 1012 95th St Ste 9, Naperville, IL 60564-5040.
- What is Michael Grassi's phone number?
- The practice phone number listed in the NPPES registry for Michael Grassi is (630) 995-3465.
- Does Michael Grassi accept Medicare?
- Michael Grassi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Grassi's NPI active?
- Yes — Michael Grassi's NPI (1689666885) is active in the NPPES registry as of the last update on 2025-03-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.