DR. MICHAEL A GRASSI MD
NPI 1689666885
Ophthalmology in Naperville, IL

Q: What is Michael Grassi's NPI number?

The NPI number for Michael Grassi is 1689666885. It was assigned to this individual provider in the NPPES registry on August 16, 2005.

Q: What is Michael Grassi's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Q: When was this NPI record last updated?

The NPPES record for Michael Grassi was last updated on March 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since August 16, 2005PECOS EnrolledAccepts Medicare Assignment

100/100

CMS Quality Rating

1012 95TH ST STE 9, NAPERVILLE, IL 60564(630) 995-3465(630) 995-3622 Get Directions Write a Review

NPPES record last updated: March 10, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Mar 10, 2025, Jul 21, 2022, Nov 2, 2017 (3 updates tracked since 2017).

On this page

About Dr. Michael A Grassi Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MICHAEL A GRASSI MD (NPI 1689666885) is an individual ophthalmology provider in Naperville, Illinois, licensed in Illinois (036115845) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Edward Hospital, and is a graduate of Northwestern University Feinberg Medical School (1999).

NPPES Registry Identity

NPI1689666885

Entity TypeIndividualMale

Primary Taxonomy207W00000X

Provider Legal NameDR. MICHAEL A GRASSICredential: MD

Location Address1012 95TH ST STE 9Naperville, IL 60564-5040

Mailing Address1012 95th St Ste 9Naperville, IL 60564-5040 · (630) 995-3465 · Fax (630) 995-3622

Phone(630) 995-3465

Fax(630) 995-3622

Sole ProprietorNo

Medical School CMSNorthwestern University Feinberg Medical SchoolGraduated 1999

Enumeration DateAugust 16, 2005

Last NPPES UpdateMarch 10, 20253 updates tracked since enumeration

NPPES CertifiedMarch 10, 2025

✔ NPI 1689666885 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians

Taxonomy Code207W00000X

License✔ Licensed in IL · 036115845

Definition

An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.

Also ListedOphthalmology · Retina SpecialistTaxonomy 207WX0107X · License 036115845 (IL)

1012 95TH ST STE 9, Naperville, IL 60564

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Michael A Grassi Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3678579711

PECOS Enrollment IDI20070118000429

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Michael Grassi reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Grassi Retina MD Sc

Same address

Retina Specialist

1012 95TH ST, SUITE 9
Naperville, IL 60564

Reassigned Medicare billing, Illinois enrollment

NPI 1598121113 (630) 995-3465

The Board Of Trustees Of The University Of Illinois

25 mi

Federally Qualified Health Center (FQHC)

3050 W 39TH PL
Chicago, IL 60632

Reassigned Medicare billing, Illinois enrollment
2,127 clinicians in this Medicare group

NPI 1932450160 (312) 413-1261

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 21

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, aflibercept, 1 mg J0178

Aflibercept injection is a treatment for certain eye conditions that affect vision. It works by blocking abnormal blood vessel growth and leakage in the eye, which can cause vision loss. The medication is administered directly into the eye by a healthcare professional.

1,990 services130 patients

Imaging of retina 92134

Imaging of the retina is a non-invasive procedure that captures detailed images of your eye's interior. This helps detect conditions like macular degeneration or retinal detachment. It's painless and takes only a few minutes.

1,740 services437 patients

Injection of drug into eye 67028

An injection into the eye is a procedure where a medication is delivered directly into your eye to treat various conditions. A local anesthetic is applied to numb the eye, ensuring minimal discomfort. The drug helps manage diseases like macular degeneration or diabetic retinopathy.

1,000 services144 patients

Exam of visual field with extended testing 92083

An extended visual field exam is a detailed test to evaluate your peripheral (side) vision. It helps to detect any potential blind spots which may not be noticeable in daily life. These could be caused by eye diseases like glaucoma, or neurological conditions.

649 services356 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

616 services268 patients

2d ultrasound scan of eye tissue and structures 76512

A 2D ultrasound scan of eye tissue and structures is a non-invasive procedure that uses sound waves to create images of your eye. It helps doctors to examine your eye's internal structures, detect abnormalities, and plan for treatments if needed.

364 services117 patients

Exam of retinal blood vessels using a special camera after injection of a dye 92235

This procedure, known as a fluorescein angiography, involves taking images of the back of your eye. A dye is injected into your arm that travels to your eye, highlighting the blood vessels in your retina. This helps identify any abnormalities.

356 services193 patients

Established patient problem focused exam of visual system 92012

This is a routine check-up for existing patients focusing on the visual system. It involves examining your eyes to detect any potential issues or changes in your vision. It's a crucial part of maintaining good eye health.

224 services76 patients

Injection, bevacizumab, 10 mg J9035

Bevacizumab is a medication given through an injection. It's designed to prevent the growth of new blood vessels that cancer cells need to grow and spread. The 10 mg dose refers to the amount of the drug in the injection.

224 services69 patients

Extended exam of the back part of the eye with retinal drawing 92201

This procedure involves a detailed examination of the back part of your eye, including the retina. It helps identify any abnormalities or issues. A retinal drawing is made to record findings. It's non-invasive and crucial for maintaining eye health.

177 services86 patients

Established patient complete exam of visual system 92014

An established patient complete exam of the visual system involves a thorough check of your eyes and vision. It assesses eye health, checks for diseases, and measures your ability to see clearly at different distances. It's a routine, non-invasive procedure.

157 services138 patients

Exam of blood vessels between the white part of eye and retina using a special camera after injection of a dye 92240

This procedure involves examining your eye's blood vessels. A special dye is injected into your body, which helps highlight these vessels in images captured by a unique camera. It provides valuable information about the health of your eyes, particularly the retina.

130 services100 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

111 services111 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

46 services35 patients

Measurement of retinal and optic nerve function targeting multiple separate locations 92274

This procedure measures the health of your eye's retina and optic nerve. It focuses on various specific areas to identify potential issues. The test is non-invasive, painless, and helps detect eye conditions early for effective treatment.

39 services32 patients

Photocoagulation treatment to prevent detachment of retina 67145

Photocoagulation is a procedure used to treat retinal disorders. A special laser is directed at the retina to create small burns. These burns form scar tissue which helps to secure the retina to the eye's wall, preventing detachment and preserving vision.

21 services12 patients

New patient complete exam of visual system 92004

A new patient complete exam of the visual system is a thorough evaluation of your eyes and vision. It checks for any potential issues and assesses overall eye health. It includes tests for visual acuity, eye movement, and light response.

17 services17 patients

Measurement of retinal and optic nerve function 92273

This procedure checks the health of your eyes, specifically the retina and optic nerve. These parts help in visual interpretation. The test involves non-invasive techniques to measure your eye's response to light and assess its functioning.

16 services16 patients

Extended exam involving color vision testing 92283

An extended exam involving color vision testing helps identify any difficulties in distinguishing colors, often due to genetic conditions or health problems. This non-invasive test involves identifying different colored numbers or patterns.

14 services14 patients

Evaluation of eye adaptation to light and dark with interpretation and report 92284

This procedure checks how your eyes adjust to different light conditions. In a dimly lit room, your eyes are first exposed to bright light. Then, the lights are turned off to see how quickly your eyes adapt to darkness. This helps identify any potential vision problems.

14 services14 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

12 services12 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Edward Hospital

Acute Care Hospitals · Naperville, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140231

Location801 South WashingtonNaperville, IL 60540 · Du Page County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60564 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$137.43 typical visit price

range $59.81 – $181.38

Typical copayment $34.35 (range $14.95 – $45.34)

Most-billed visit code 99204

Established Patient

$74.38 typical visit price

range $19.15 – $147.12

Typical copayment $18.59 (range $4.78 – $36.78)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

100/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Individually scored

Quality

100

Improvement Activities

Reported Quality Measures

Closing the Referral Loop: Receipt of Specialist Report

93%149 patients5/55-star benchmark: 87%

Diabetes: Eye Exam

100%295 patients5/55-star benchmark: 100%

Diabetic Macular Edema - Loss of Visual Acuity

100%82 patients

Diabetic Retinopathy: Communication with the Physician Managing Ongoing Diabetes Care

99%204 patients4/55-star benchmark: 100%

Falls: Screening for Future Fall Risk

98%600 patients4/55-star benchmark: 100%

Overuse of Imaging for the Evaluation of Primary Headache

Lower rates are better for this measure.

0%26 patients

Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention

Patients combinedPopulations: 100% · 731 patients

Patients screened: 100% · 731 patients

100%40 patients5/55-star benchmark: 100%

Use of High-Risk Medications in Older Adults

Lower rates are better for this measure.

Patients appropriateDiagnosis: 0% · 631 patients

Patients totalRate: 0% · 631 patients

0%631 patients5/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Michael Grassi's NPI number?

The NPI number for Michael Grassi is 1689666885. It was assigned to this individual provider in the NPPES registry on August 16, 2005.

Where is Michael Grassi located?

Michael Grassi practices at 1012 95th St Ste 9, Naperville, IL 60564. The listed phone number is (630) 995-3465.

What is Michael Grassi's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Michael Grassi enrolled in Medicare?

Yes. Michael Grassi is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Michael Grassi's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Grassi reassigns Medicare benefits to 2 organizations: Grassi Retina MD Sc (Naperville, IL) and The Board Of Trustees Of The University Of Illinois (Chicago, IL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Michael Grassi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Michael Grassi accept?

Health plans from Oscar Health list Michael Grassi as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Michael Grassi affiliated with any hospitals?

According to CMS data, Michael Grassi is affiliated with Edward Hospital.

When was this NPI record last updated?

The NPPES record for Michael Grassi was last updated on March 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.