JOHN ANGELO GNASSI MD
NPI 1629066105
Family Medicine in Parker, AZ
About John Angelo Gnassi Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN ANGELO GNASSI MD (NPI 1629066105) is an individual family medicine provider in Parker, Arizona, licensed in Massachusetts (74549) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, maintains a secondary practice location in Everett, and is a graduate of Rutgers R W Johnson Medical School (cam/new Bruns/pisc) (1988).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
John Angelo Gnassi Md 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.
Medicare Billing Reassignments
4Medicare enrollment records show John Gnassi reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Parker, AZ 85344
- Reassigned Medicare billing, Texas enrollment
- 208 clinicians in this Medicare group
Leupp, AZ 86035
- Reassigned Medicare billing, Texas enrollment
- 219 clinicians in this Medicare group
Fort Washakie, WY 82514
- Reassigned Medicare billing, Texas enrollment
- Medicare enrollment name: U S Health Dept Of Health & Human Services
- 306 clinicians in this Medicare group
Cambridge, MA 02139
- Reassigned Medicare billing, Massachusetts enrollment
- 719 clinicians in this Medicare group
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 85344 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 John Gnassi's NPI number?
The NPI number for John Gnassi is 1629066105. It was assigned to this individual provider in the NPPES registry on October 10, 2005.
Where is John Gnassi located?
John Gnassi practices at 12033 Agency Rd, Parker, AZ 85344. The listed phone number is (928) 669-2137.
What is John Gnassi's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is John Gnassi enrolled in Medicare?
Yes. John Gnassi 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 John Gnassi's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Gnassi reassigns Medicare benefits to 4 organizations: Dhhs Ihs Phoenix Area (Parker, AZ), Winslow Indian Health Care Center, Inc (Leupp, AZ), Us Health Dept Of Health & Human Services (Fort Washakie, WY) and Cambridge Public Health Commission (Cambridge, MA). 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 John Gnassi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Gnassi was last updated on August 11, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# John Angelo Gnassi, MD · NPI 1629066105
Family Medicine physician in Parker, Arizona. Individual provider, active in the CMS NPPES registry since October 10, 2005.
## Identity
- **NPI:** 1629066105 (Entity type: Individual)
- **Enumerated:** October 10, 2005
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 74549 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 12033 AGENCY RD, Parker, AZ 85344-7718
- **Phone:** (928) 669-2137
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Dhhs Ihs Phoenix Area (NPI 1851678585, Parker, AZ); Winslow Indian Health Care Center, Inc (NPI 1760652580, Leupp, AZ); Us Health Dept Of Health & Human Services (NPI 1023174299, Fort Washakie, WY); Cambridge Public Health Commission (NPI 1487603585, Cambridge, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Rutgers R W Johnson Medical School, class of 1988
## Record status
- **NPPES last updated:** August 11, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1629066105) · Data from the CMS NPPES public registry.