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ANTOINE SASSINE
NPI 1700403268
Internal Medicine in Grand Rapids, MI

Active since July 01, 2020PECOS EnrolledAccepts Medicare Assignment
300 LAFAYETTE AVE SE STE 3000, GRAND RAPIDS, MI 49503(616) 685-6919 Get Directions Write a Review

NPPES record last updated: May 26, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 26, 2026, Jun 19, 2023, Jul 1, 2020 (3 updates tracked since 2020).

About Antoine Sassine NPPES

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

ANTOINE SASSINE (NPI 1700403268) is an individual internal medicine provider in Grand Rapids, Michigan, licensed in Michigan (4301518035) and active in the NPI registry since July 2020. He is enrolled in Medicare PECOS, maintains a secondary practice location in Grand Rapids, and is a graduate of Central Michigan College Of Medicine (2023).

NPPES Registry Identity

NPI1700403268
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameANTOINE SASSINE
Location Address300 LAFAYETTE AVE SE STE 3000Grand Rapids, MI 49503-4692
Mailing AddressPo Box 776974Chicago, IL 60677-6974 · (616) 685-1808 · Fax (312) 957-2939
Phone(616) 685-6919
Sole ProprietorYes
Medical School CMSCentral Michigan College Of MedicineGraduated 2023
Enumeration DateJuly 1, 2020
Last NPPES UpdateMay 26, 20263 updates tracked since enumeration
NPPES CertifiedMay 26, 2026
✔ NPI 1700403268 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MI · 4301518035
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
300 LAFAYETTE AVE SE STE 3000, Grand Rapids, MI 49503
Open in Google Maps ↗

Secondary Practice Location 1

Location 1200 Jefferson Ave SEGrand Rapids, MI 49503-4502 · Phone (616) 685-5576

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company, Priority 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

Antoine Sassine 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 ID4183194590
PECOS Enrollment IDI20260527002483
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 Reassignment

Medicare enrollment records show Antoine Sassine reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Advantage Health Saint Mary's Medical Group
0.1 mi
Multi-Specialty
200 JEFFERSON SE
Grand Rapids, MI 49503
  • Reassigned Medicare billing, Michigan enrollment
  • 737 clinicians in this Medicare group
NPI 1952340911 (616) 685-5000

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 49503 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
$126.15 typical visit price
range $54.34 – $166.68
Typical copayment $31.53 (range $13.58 – $41.67)
Most-billed visit code 99204
Established Patient
$96.44 typical visit price
range $17.09 – $135.40
Typical copayment $24.11 (range $4.27 – $33.85)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

STEVEN JAMES STANTON MD
Internal Medicine
300 LAFAYETTE AVE SE STE 3000
GRAND RAPIDS, MI 49503
Kent County (616) 685-6919
ANUOLUWAPO OMOBOLANLE KOLAWOLE DO
Internal Medicine
300 LAFAYETTE AVE SE STE 3000
GRAND RAPIDS, MI 49503
Kent County (616) 685-6919
MADISON CHRISTINE JONES DO
Internal Medicine
300 LAFAYETTE AVE SE STE 3000
GRAND RAPIDS, MI 49503
Kent County (616) 685-6919
CATHERINE CARLE MD
Internal Medicine
300 LAFAYETTE AVE SE STE 3000
GRAND RAPIDS, MI 49503
Kent County (616) 685-6919
PATRICK DANIEL PAWLACZYK MD
Internal Medicine
300 LAFAYETTE AVE SE STE 3000
GRAND RAPIDS, MI 49503
Kent County (616) 685-6919
ZAIN KHURRAM SIDDIQUI DO
Internal Medicine
300 LAFAYETTE AVE SE STE 3000
GRAND RAPIDS, MI 49503
Kent County (616) 685-6919
MR. MICHAEL JAMES KOPKA I MD
Internal Medicine
300 LAFAYETTE AVE SE STE 3000
GRAND RAPIDS, MI 49503
Kent County (616) 685-6919
KEERTHI KIRAN SAJJA DO
Internal Medicine
300 LAFAYETTE AVE SE STE 3000
GRAND RAPIDS, MI 49503
Kent County (616) 685-4615

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 Antoine Sassine's NPI number?

The NPI number for Antoine Sassine is 1700403268. It was assigned to this individual provider in the NPPES registry on July 1, 2020.

Where is Antoine Sassine located?

Antoine Sassine practices at 300 Lafayette Ave SE Ste 3000, Grand Rapids, MI 49503. The listed phone number is (616) 685-6919.

What is Antoine Sassine's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Antoine Sassine enrolled in Medicare?

Yes. Antoine Sassine 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 organization bills Medicare for Antoine Sassine's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Antoine Sassine reassigns Medicare benefits to Advantage Health Saint Mary's Medical Group (Grand Rapids, MI). The 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 Antoine Sassine's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Antoine Sassine accept?

Health plans from Oscar Insurance Company and Priority Health list Antoine Sassine 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.

When was this NPI record last updated?

The NPPES record for Antoine Sassine was last updated on May 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.