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HOLLYN ZAMMIT GREGORY MSN, FNP
NPI 1144621095
Nurse Practitioner - Family in Mason, OH

Active since September 10, 2014PECOS EnrolledAccepts Medicare Assignment
5100 TERRA FIRMA DR, MASON, OH 45040(513) 492-5787 Get Directions Write a Review

NPPES record last updated: September 10, 2014. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Hollyn Zammit Gregory Msn, Fnp NPPES

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

HOLLYN ZAMMIT GREGORY MSN, FNP (NPI 1144621095) is an individual family provider in Mason, Ohio, licensed in Ohio (COA.16461-NP) and active in the NPI registry since September 2014. She is enrolled in Medicare PECOS and is a graduate of University Of Cincinnati College Of Medicine (2014).

NPPES Registry Identity

NPI1144621095
Entity TypeIndividualFemale
Primary Taxonomy363LF0000X
Provider Legal NameHOLLYN ZAMMIT GREGORYCredential: MSN, FNP
Location Address5100 TERRA FIRMA DRMason, OH 45040-8087
Mailing Address2620 Elm Hill PikeNashville, TN 37214-3108 · (615) 425-4200
Phone(513) 492-5787
Sole ProprietorNo
Medical School CMSUniversity Of Cincinnati College Of MedicineGraduated 2014
Enumeration DateSeptember 10, 2014
✔ NPI 1144621095 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License✔ Licensed in OH · COA.16461-NP
5100 TERRA FIRMA DR, Mason, OH 45040
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.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

Hollyn Zammit Gregory Msn, Fnp 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 ID2365662632
PECOS Enrollment IDI20141008002228
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

2

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

City Of Cincinnati
12 mi
Primary Care
5818 MADISON RD, BRAXTON F CANN MEMORIAL MEDICAL CENTER
Cincinnati, OH 45227
  • Reassigned Medicare billing, Ohio enrollment
  • 49 clinicians in this Medicare group
NPI 1770598492 (513) 271-6089
Community Care Health Network LLC
256 mi
Nurse Practitioner
424 CHURCH ST STE 220
Nashville, TN 37219
  • Reassigned Medicare billing, Ohio enrollment
  • 271 clinicians in this Medicare group
NPI 1619368842 (877) 564-3627

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 45040 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
$84.72 typical visit price
range $54.34 – $166.65
Typical copayment $21.18 (range $13.58 – $41.66)
Most-billed visit code 99203
Established Patient
$96.44 typical visit price
range $17.10 – $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 15

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

MEHREEN ADHAMI
Pharmacist
5100 TERRA FIRMA DR
MASON, OH 45040
Warren County (513) 229-5920
MEGHAN HOSSEIN FNP
Nurse Practitioner (Family)
5100 TERRA FIRMA DR
MASON, OH 45040
Warren County (513) 492-5787
MRS. RENEE LYNN BRUGGER PHARMD, RPH
Pharmacist
5100 TERRA FIRMA DR
MASON, OH 45040
Warren County (513) 229-5920
CHAD ASHTON WOLF
Nurse Practitioner (Family)
5100 TERRA FIRMA DR
MASON, OH 45040
Warren County (513) 492-5787
MS. THERESA GALE RIGGS FNP-C, APRN
Nurse Practitioner (Family)
5100 TERRA FIRMA DR
MASON, OH 45040
Warren County (513) 492-5787
FAIZA IFTIKHAR
Pharmacist
5100 TERRA FIRMA DR
MASON, OH 45040
Warren County (513) 229-5920
XIAONA LIU
Nurse Practitioner (Family)
5100 TERRA FIRMA DR
MASON, OH 45040
Warren County (513) 492-5787
THE LITTLE CLINIC OF OHIO LLC
Nurse Practitioner (Family)
5100 TERRA FIRMA DR
MASON, OH 45040
Warren County (615) 425-4287

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 Hollyn Gregory's NPI number?

The NPI number for Hollyn Gregory is 1144621095. It was assigned to this individual provider in the NPPES registry on September 10, 2014.

Where is Hollyn Gregory located?

Hollyn Gregory practices at 5100 Terra Firma Dr, Mason, OH 45040. The listed phone number is (513) 492-5787.

What is Hollyn Gregory's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Hollyn Gregory enrolled in Medicare?

Yes. Hollyn Gregory 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 Hollyn Gregory's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hollyn Gregory reassigns Medicare benefits to 2 organizations: City Of Cincinnati (Cincinnati, OH) and Community Care Health Network LLC (Nashville, TN). 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 Hollyn Gregory's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Hollyn Gregory accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, CareSource and MedMutual list Hollyn Gregory 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 Hollyn Gregory was last updated on September 10, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years 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.