Hollyn Zammit Gregory, MSN, FNP
Family Nurse Practitioner · Mason, OH
Hollyn Zammit Gregory, MSN, FNP is a family nurse practitioner with a practice address in Mason, Ohio, and NPI 1144621095, issued on Sep 10, 2014. Check the license (Ohio COA.16461-NP, as entered in NPPES) with the Ohio board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Hollyn Zammit Gregory
- Credential
- MSN, FNP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- COA.16461-NP OH
Self-reported in NPPES; status is on the state search - Practice location
- 5100 Terra Firma Dr, Mason, OH 45040
- Phone
- (513) 492-5787
- Enumerated
- Sep 10, 2014
- Record last updated
- Sep 10, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20141008002228); accepts Medicare assignment
- Medical or professional school
- University Of Cincinnati College Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 9,647 in Ohio → Look up another NPI →
Also registered at 5100 Terra Firma Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mehreen AdhamiPharmacist1043819428
- Renee Brugger, PHARMD, RPHPharmacist1194117788
- Kendra Hall, RPHPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1578435962
- Meghan Hossein, FNPFamily Nurse Practitioner1134759236
- Faiza IftikharPharmacist1225806037
- Irina Kanter, FNP-BCFamily Nurse Practitioner1881938678
Verify Hollyn Zammit Gregory in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Ohio board licenses this profession
Search for license COA.16461-NPCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- City OF CincinnatiCincinnati, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hollyn Zammit Gregory among 9,647 family nurse practitioner records in Ohio
Hollyn Zammit Gregory, MSN, FNP is one of 9,647 family nurse practitioner records with a practice address in Ohio. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 22% of them.
- NPI issued2014 · 22% of these records are older, 74% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2014 · median 2018 among the 6,366 with a school on file
- Record last updated2014 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
47 family nurse practitioner records list a practice address in Mason
They are 47 of the 1,495 NPPES records with a practice address in Mason, and 9,647 family nurse practitioner records in Ohio.
All 9,647 in Ohio → Every provider in Mason → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Theophilia Akomah-Donkor, FNPMason, OH 450401861723827
- Amber Bramlee, FNPMason, OH 450401295032902
- Clare Herbert, NPMason, OH 450401104054055
- Irina Kanter, FNP-BCMason, OH 450401881938678
- Michelle Khosla, N.P.Mason, OH 450401932463551
- Emily Krans, CNP, RNMason, OH 450401962715193
- Heather Maier, MSN, CNPMason, OH 450401043352628
- Margaret Rawlings, NPMason, OH 450401265855993
Common questions
What is Hollyn Zammit Gregory, MSN, FNP's NPI number?
Hollyn Zammit Gregory, MSN, FNP's National Provider Identifier (NPI) is 1144621095, issued on Sep 10, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Hollyn Zammit Gregory, MSN, FNP located?
The NPPES record lists a practice address at 5100 Terra Firma Dr, Mason, OH, 45040. Phone: (513) 492-5787. Providers update this record themselves, so call before visiting.
How can I verify Hollyn Zammit Gregory, MSN, FNP's license?
NPPES lists Ohio license number COA.16461-NP, as entered by the provider. Search the Ohio board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.