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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARK THOMAS GRILLI DO
NPI 1851089593
Family Medicine in Flemington, NJ

Active since May 01, 2023PECOS EnrolledAccepts Medicare Assignment
9100 WESCOTT DR STE 103, FLEMINGTON, NJ 08822(908) 237-6910(908) 237-6919 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 29, 2026, May 1, 2023 (2 updates tracked since 2023).

About Dr. Mark Thomas Grilli Do NPPES

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

DR. MARK THOMAS GRILLI DO (NPI 1851089593) is an individual family medicine provider in Flemington, New Jersey, licensed in New Jersey (25MB13205800) and active in the NPI registry since May 2023. He is enrolled in Medicare PECOS and is a graduate of Other (2023).

NPPES Registry Identity

NPI1851089593
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. MARK THOMAS GRILLICredential: DO
Location Address9100 WESCOTT DR STE 103Flemington, NJ 08822-4677
Mailing Address9100 Wescott Dr Ste 103Flemington, NJ 08822-4677 · (908) 237-6910 · Fax (908) 237-6919
Phone(908) 237-6910
Fax(908) 237-6919
Sole ProprietorNo
Medical School CMSOtherGraduated 2023
Enumeration DateMay 1, 2023
Last NPPES UpdateSeptember 29, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 29, 2026
✔ NPI 1851089593 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in NJ · 25MB13205800
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
9100 WESCOTT DR STE 103, Flemington, NJ 08822
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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. Mark Thomas Grilli Do 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 ID7911466222
PECOS Enrollment IDI20260827000924
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 Mark Grilli reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Hunterdon Primary Care, PC
Same address
Family Medicine
1100 WESCOTT DR, SUITE 101
Flemington, NJ 08822
  • Reassigned Medicare billing, New Jersey enrollment
  • 90 clinicians in this Medicare group
NPI 1710428289 (908) 788-6535

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 08822 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
$98.09 typical visit price
range $63.84 – $190.92
Typical copayment $24.52 (range $15.96 – $47.73)
Most-billed visit code 99203
Established Patient
$111.57 typical visit price
range $20.97 – $155.92
Typical copayment $27.89 (range $5.24 – $38.98)
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 3

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

JOANA GJIDEDE PHARMD
Pharmacist (Ambulatory Care)
9100 WESCOTT DR STE 103
FLEMINGTON, NJ 08822
Hunterdon County (908) 284-5803
DR. BEATA MARIA PAZDAN MD
Family Medicine
9100 WESCOTT DR STE 103
FLEMINGTON, NJ 08822
Hunterdon County (908) 237-6910
KIMBERLY MARTINO PA-C
Physician Assistant (Medical)
9100 WESCOTT DR STE 103
FLEMINGTON, NJ 08822
Hunterdon County (908) 237-6910

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 Mark Grilli's NPI number?

The NPI number for Mark Grilli is 1851089593. It was assigned to this individual provider in the NPPES registry on May 1, 2023.

Where is Mark Grilli located?

Mark Grilli practices at 9100 Wescott Dr Ste 103, Flemington, NJ 08822. The listed phone number is (908) 237-6910.

What is Mark Grilli's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Mark Grilli enrolled in Medicare?

Yes. Mark Grilli 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 Mark Grilli's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Grilli reassigns Medicare benefits to Hunterdon Primary Care, PC (Flemington, NJ). 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 Mark Grilli's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Grilli accept?

Health plans from Oscar Health list Mark Grilli 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 Mark Grilli was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 25 days 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.