John Angelo Gnassi, MD
Family Medicine Physician · Parker, AZ
John Angelo Gnassi, MD is a family medicine physician with a practice address in Parker, Arizona, and NPI 1629066105, issued on Oct 10, 2005. Check the license on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Angelo Gnassi
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 74549 MA
Self-reported in NPPES; status is on the state search - Practice location
- 12033 Agency RD, Parker, AZ 85344
- Phone
- (928) 669-2137
- Enumerated
- Oct 10, 2005
- Record last updated
- Aug 11, 2022
- Medicare enrollment
- Enrolled (PECOS I20210119001789); accepts Medicare assignment
- Medical or professional school
- Rutgers R W Johnson Medical School (Cam/New Bruns/Pisc), 1988
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,119 in Arizona → Look up another NPI →
Also registered at 12033 Agency RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Diane Adams, DOInternal Medicine Physician1073520474
- Sheila AdamsRegistered Nurse1336537620
- Folaremi Adeyemo, PHARMDPharmacist1093363020
- Cynthia AitkenRegistered Nurse1184176687
- Joanne Ajero-Ehlers, RNRegistered Nurse1912110420
- Ezzaddin Al Wahsh, M.D.Hospitalist Physician1033525456
Verify John Angelo Gnassi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
64 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Pantoprazole Sodium14 claims
- Levetiracetam12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Winslow Indian Health Care Center IncWinslow, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Angelo Gnassi among 3,119 family medicine physician records in Arizona
John Angelo Gnassi, MD is one of 3,119 family medicine physician records with a practice address in Arizona. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 88% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated1988 · median 2006 among the 1,775 with a school on file
- Record last updated2022 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 family medicine physician records list a practice address in Parker
They are 12 of the 352 NPPES records with a practice address in Parker, and 3,119 family medicine physician records in Arizona.
All 3,119 in Arizona → Every provider in Parker → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Quinn Bott, MD, PHARMDParker, AZ 853441336572619
- Barton Butterbaugh, M.D.Parker, AZ 853441881732899
- Jesus Carpio, M.D.Parker, AZ 853441487675617
- Cedric Davis, M.DParker, AZ 853441356534994
- Gerald Ferris, M.D.Parker, AZ 853441417999103
- Richard Greco, D.O.Parker, AZ 853441497730717
- John Hierling, D.O.Parker, AZ 853441629073689
- Mary McCoy, M.D.Parker, AZ 853441437289782
Common questions
What is John Angelo Gnassi, MD's NPI number?
John Angelo Gnassi, MD's National Provider Identifier (NPI) is 1629066105, issued on Oct 10, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John Angelo Gnassi, MD located?
The NPPES record lists a practice address at 12033 Agency RD, Parker, AZ, 85344. Phone: (928) 669-2137. Providers update this record themselves, so call before visiting.
How can I verify John Angelo Gnassi, MD's license?
Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Angelo Gnassi, MD prescribe under Medicare Part D?
In 2024, John Angelo Gnassi, MD had 64 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions 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.