Proc Annu Symp Comput Appl Med Care
Information Storage and RetrievalUnified Medical Language System
Dr. John Angelo Gnassi, MD
NPI1629066105PAC ID2365488715
- Medicare services, 2021
- 102
- Part D claims, 2024
- 64
- Publications
- 4
- Hospital affiliations
- 2
- Medical groups
- 4
- Practice address
- 1501 North Williamson Avenue, Winslow, AZ 86047
- Practice phone
- Call (928) 289-4691
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Gnassi's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Angelo Gnassi is a family medicine physician in Winslow, Arizona
Dr. Gnassi practices at Little Colorado Medical Center in Winslow, Arizona, part of Little Colorado Medical Center.
Dr. Gnassi's NPI, 1629066105, was assigned on October 10, 2005. Dr. Gnassi graduated from Rutgers Robert Wood Johnson Medical School in 1988. Dr. Gnassi holds Massachusetts license 74549.
NPI and contact details
- NPI
- 1629066105NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2365488715
- NPI enumeration date
- October 10, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (928) 289-4691
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Angelo Gnassi practices at Little Colorado Medical Center in Winslow, Arizona
Dr. Gnassi's primary practice is Little Colorado Medical Center, at 1501 North Williamson Avenue, Winslow, AZ 86047 in Navajo County. The practice phone is (928) 289-4691.
- Little Colorado Medical Center1501 North Williamson Avenue, Winslow, AZ 86047 · Navajo CountyPhone(928) 289-4691
Source: Dmand AI Affiliation Data
Dr. John Angelo Gnassi is affiliated with 3 sites of care and 4 medical groups
Dr. Gnassi's primary practice is Little Colorado Medical Center in Winslow, Arizona, part of Little Colorado Medical Center. Dr. Gnassi is also affiliated with Parker Indian Health Center. The medical group on file is Winslow Indian Health Care Center. Dmand AI also links Dr. Gnassi to 3 more medical groups and 1 government or correctional health site, each named with a free account.
Parker Indian Health CenterWinslow Indian Health Care Center3 medical groupsNames with a free account1 government or correctional health siteName with a free account
See all 7 affiliations for Dr. GnassiSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Angelo Gnassi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gnassi practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Little Colorado Medical Center | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every hospital where Dr. Gnassi practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across Little Colorado Medical Center and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John Angelo Gnassi is one of 2,549 family medicine physicians in Arizona
Family medicine is Dr. Gnassi's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Gnassi is board certified in family medicine by the American Board of Family Medicine. Dmand AI has Dr. Gnassi's licenses on file in 2 states: Massachusetts and Minnesota.
Specialties and state licenses
- Family medicine, MassachusettsPrimary
- Minnesota license
Clinical focus
Dmand AI lists pneumonia and respiratory infection among the conditions Dr. Gnassi treats.
Family medicine physicians near Dr. Gnassi
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
2,549family medicine physicians in Arizona25family medicine physicians in Winslow14family medicine physicians at Little Colorado Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Angelo Gnassi billed Medicare for 102 services in 2021
CMS data shows 102 Medicare services from Dr. Gnassi across 3 procedure codes in 2021, all of them office visits. Medicare paid $4,693 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2021102
Paid by Medicare$4,693
Procedure codes3
Dr. Gnassi's Medicare services by type, 2019 to 2021
- 2019
- 2021
- Office and hospital visits
- 2019: 162021: 102538%
Dr. Gnassi compared with the Arizona median for family medicine physicians, 2021
- Dr. Gnassi
- Arizona median
- Medicare services
- 102vs 33069% below
- Part D claims
- 26vs 68296% below
Medians across 2,480 family medicine physicians in Arizona with Dmand AI profiles that report each measure.
Dr. Gnassi's most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Gnassi?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gnassi and other family medicine physicians in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Angelo Gnassi's patients have a median age of 54
Across all payers, Dmand AI patient panel data puts Dr. Gnassi's median patient age at 54, with 64% women.
Dr. Gnassi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 54
Patient panel by sex, all payers
- Women64%
- Men36%
Source: Dmand AI Patient Panel Data
Dr. John Angelo Gnassi wrote 64 Medicare Part D claims in 2024
In 2024, Dr. Gnassi wrote 64 Medicare Part D claims. 83% of them were for generic drugs. CMS names the drug for 26 of them, across 2 drugs with 11 or more claims each, at $460 in total drug cost. In 2023, CMS named 14 claims across 1 drug.
Part D claims, 202464
Drugs named by CMS2
Total drug cost$460
Dr. Gnassi's Part D claims by kind of drug, 2024
- Generic53 claims83%
- Brand-name11 claims17%
Dr. Gnassi's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 142024: 2686%
Drugs named by CMS: 2 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. John Angelo Gnassi takes part in Medicare
Dr. Gnassi accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Find family medicine physicians like Dr. Gnassi by procedure volume and prescribing
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. John Angelo Gnassi has 4 publications on record
Dmand AI links 4 papers to Dr. Gnassi. The most frequent topics are Information Storage and Retrieval, Subject Headings and Unified Medical Language System. Dr. Gnassi has published most often in Proc Annu Symp Comput Appl Med Care. Dr. Gnassi's most frequent co-authors are Gene Henry Barnett, MD, Robert Grundmeier, MD and Richard Jay Kim, MD.
Papers4
Topics Dr. Gnassi writes about most
- Information Storage and Retrieval
- Subject Headings
- Unified Medical Language System
Dr. Gnassi's most frequent co-authors
- Gene Henry Barnett, MD4 shared papers
- Robert Grundmeier, MD2 shared papers
- Richard Jay Kim, MD1 shared paper
Recent publications by Dr. Gnassi
Proc Annu Symp Comput Appl Med Care
Computer Communication NetworksInformation SystemsUnified Medical Language System
Proc Annu Symp Comput Appl Med Care
AlgorithmsInformation Storage and RetrievalMEDLINE
Proc Annu Symp Comput Appl Med Care
Abstracting and IndexingAmbulatory Care Information SystemsDrug Information Services
See who Dr. Gnassi researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gnassi works with, so you can find a warm path to the right family medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John Angelo Gnassi graduated from Rutgers Robert Wood Johnson Medical School
Dr. Gnassi graduated from Rutgers Robert Wood Johnson Medical School in 1988. Dr. Gnassi is a member of AAFP.
- Medical school
- Board certified in family medicine
Source: Dmand AI Professional Profile Data
Dr. John Angelo Gnassi accepts plans from 1 insurance carrier
Dr. Gnassi is in network with 1 carrier, including Molina. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Molina
Plan types Dr. Gnassi accepts, by number of carriers
- Medicaid1
- Medicare1
Source: Dmand AI Insurance Network Data
Sources for Dr. John Angelo Gnassi's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John Angelo Gnassi
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John Angelo Gnassi's NPI number?
Dr. John Angelo Gnassi's NPI number is 1629066105. It was assigned on October 10, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John Angelo Gnassi?
Dr. John Angelo Gnassi is a family medicine physician in Winslow, Arizona. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. John Angelo Gnassi practice?
Dr. Gnassi practices at 1501 North Williamson Avenue, Winslow, AZ 86047. Dr. Gnassi's primary practice is Little Colorado Medical Center in Winslow, Arizona, part of Little Colorado Medical Center. Dmand AI also links Dr. Gnassi to 3 medical groups and 1 government or correctional health site.
What is Dr. John Angelo Gnassi's office phone number?
The practice phone on file for Dr. Gnassi is (928) 289-4691.
What is Dr. John Angelo Gnassi's medical license number?
Dr. Gnassi holds Massachusetts license 74549, one of the licenses on file in 2 states.
Which states has Dr. John Angelo Gnassi been licensed in?
Dmand AI has state licenses on file for Dr. Gnassi in Massachusetts (1991 to 2026) and Minnesota (1989 to 1994).
Which hospitals is Dr. John Angelo Gnassi affiliated with?
Dr. Gnassi practices at Little Colorado Medical Center in Winslow, Arizona. Dr. Gnassi is also affiliated with Parker Indian Health Center.
What medical group is Dr. John Angelo Gnassi part of?
Dr. Gnassi is linked to Winslow Indian Health Care Center. Dmand AI links Dr. Gnassi to 3 more medical groups.
Does Dr. John Angelo Gnassi accept Medicare?
Yes. CMS data shows Dr. Gnassi billed Medicare for 102 services in 2021, and Dr. Gnassi accepts Medicare assignment.
Is Dr. John Angelo Gnassi board certified?
Yes. Dr. Gnassi is board certified in family medicine by the American Board of Family Medicine.
Show 7 more questionsShow fewer questions
What services does Dr. John Angelo Gnassi bill to Medicare?
In 2021, Dr. Gnassi's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and office visit, established patient (99212).
Where did Dr. John Angelo Gnassi go to medical school?
Dr. Gnassi graduated from Rutgers Robert Wood Johnson Medical School in 1988.
What drugs does Dr. John Angelo Gnassi prescribe most?
In 2024 Medicare Part D data, Dr. Gnassi's most prescribed drugs by claims were Pantoprazole Sodium and Levetiracetam.
How long has Dr. John Angelo Gnassi been practicing?
Dr. Gnassi graduated from medical school in 1988, 38 years ago.
Does Dr. John Angelo Gnassi do research?
Dmand AI links 4 publications to Dr. Gnassi.
Who does Dr. John Angelo Gnassi publish with?
Dr. Gnassi's most frequent co-authors are Gene Henry Barnett, MD (4 shared papers), Robert Grundmeier, MD (2 shared papers) and Richard Jay Kim, MD (1 shared paper).
What insurance does Dr. John Angelo Gnassi accept?
Dr. Gnassi is in network with 1 carrier, including Molina. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
Selling to family medicine practices?
See family medicine physicians in Arizona by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card