John Gnassi, MD
NPI 1629066105 · Family Medicine Physician · Parker, AZ
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Gnassi, MD is a Family Medicine Physician provider in Parker, AZ (NPI 1629066105).
Provider details
- NPI number
- 1629066105
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 74549 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Pantoprazole Sodium | 14 |
| Levetiracetam | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 103 Garland StEverett, MA 02149-5066Phone: (617) 389-6270
Registry dates
- Enumerated
- 2005-10-10
- Last updated
- 2022-08-11
- Certified
- 2022-08-11
Frequently asked questions
- What is John Gnassi's NPI number?
- John Gnassi's National Provider Identifier (NPI) is 1629066105, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Gnassi's specialty?
- John Gnassi is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Gnassi located?
- John Gnassi's practice location on file with NPPES is 12033 Agency Rd, Parker, AZ 85344-7718.
- What is John Gnassi's phone number?
- The practice phone number listed in the NPPES registry for John Gnassi is (928) 669-2137.
- Does John Gnassi accept Medicare?
- John Gnassi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Gnassi's NPI active?
- Yes — John Gnassi's NPI (1629066105) is active in the NPPES registry as of the last update on 2022-08-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.