Curr Opin Gastroenterol
Anastomosis, SurgicalCrohn DiseaseDigestive System Surgical Procedures
Dr. Gassan Kassim, MD
NPI1396231890PAC ID2365788536
- Part D claims, 2024
- 140
- Publications
- 6
- Hospital affiliations
- 4
- Industry payments
- $797
- Medical group
- 1
- Practice address
- 5777 East Mayo Boulevard, Phoenix, AZ 85054
- Practice phone
- Call (480) 342-4201
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Kassim'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. Gassan Kassim is a gastroenterologist in Phoenix, Arizona
Dr. Kassim practices at Mayo Clinic Hospital - Phoenix in Phoenix, Arizona, part of Mayo Clinic.
Dr. Kassim's NPI, 1396231890, was assigned on July 8, 2018. Dr. Kassim holds Arizona license R78884.
NPI and contact details
- NPI
- 1396231890NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2365788536
- NPI enumeration date
- July 8, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (480) 342-4201
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gassan Kassim practices at Mayo Clinic Hospital - Phoenix in Phoenix, Arizona
Dr. Kassim's primary practice is Mayo Clinic Hospital - Phoenix, at 5777 East Mayo Boulevard, Phoenix, AZ 85054 in Maricopa County. The practice phone is (480) 342-4201.
- Mayo Clinic Hospital - Phoenix5777 East Mayo Boulevard, Phoenix, AZ 85054 · Maricopa CountyPhone(480) 342-4201
Source: Dmand AI Affiliation Data
Dr. Gassan Kassim is affiliated with 4 sites of care and 1 medical group
Dr. Kassim's primary practice is Mayo Clinic Hospital - Phoenix in Phoenix, Arizona, part of Mayo Clinic. Dr. Kassim is also affiliated with Barnes-Jewish Hospital. The medical group on file is WashU Medicine Psychiatry. Dmand AI also links Dr. Kassim to 2 more hospitals, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gassan Kassim's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kassim practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mayo Clinic Hospital - Phoenix | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gassan Kassim is one of 380 gastroenterologists in Arizona
Gastroenterology is Dr. Kassim's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Kassim is licensed in Arizona.
Specialties and state licenses
- Gastroenterology, ArizonaPrimary
Gastroenterologists near Dr. Kassim
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
380gastroenterologists in Arizona108gastroenterologists in Phoenix49gastroenterologists at Mayo Clinic Hospital - Phoenix
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gassan Kassim's patients have a median age of 65
Across all payers, Dmand AI patient panel data puts Dr. Kassim's median patient age at 65, with 60% women.
Dr. Kassim's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women60%
- Men39%
Source: Dmand AI Patient Panel Data
Dr. Gassan Kassim wrote 140 Medicare Part D claims in 2024
In 2024, Dr. Kassim wrote 140 Medicare Part D claims for 50 patients. 86% of them were for generic drugs. CMS names the drug for 67 of them, across 4 drugs with 11 or more claims each, at $11,769 in total drug cost. In 2023, CMS named 75 claims across 4 drugs.
Part D claims, 2024140
Drugs named by CMS4
Total drug cost$11,769
Part D patients50
Dr. Kassim's Part D claims by kind of drug, 2024
- Generic121 claims86%
- Brand-name19 claims14%
Dr. Kassim'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: 752024: 6711%
Drugs named by CMS: 4 in 2024, 4 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
Dr. Gassan Kassim ranks in the 65th percentile for colonoscopy in Medicare
Dr. Kassim accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 53 procedures of colonoscopy by Dr. Kassim, more than 65% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Kassim ranks in Medicare procedure volume
- Colonoscopy
- 65th percentile53 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 62nd percentile47 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Gassan Kassim has 6 publications on record
Dmand AI links 6 papers to Dr. Kassim, published from 2020 to 2025. 2020 was the busiest year, with 3. The most frequent topics are Coronavirus Infections, COVID-19 and Crohn Disease. Dr. Kassim's most frequent co-authors are Karissa Nicole Arca, MD, Jordan Eric Axelrad, MD, MPH and Puneet B. Belani, MD.
Papers6
Years published2020 to 2025
Dr. Kassim's papers by year, 2020 to 2025
Topics Dr. Kassim writes about most
- Coronavirus Infections
- COVID-19
- Crohn Disease
- Pandemics
- Pneumonia, Viral
- SARS-CoV-2
Dr. Kassim's most frequent co-authors
- Karissa Nicole Arca, MD1 shared paper
- Jordan Eric Axelrad, MD, MPH1 shared paper
- Puneet B. Belani, MD1 shared paper
Recent publications by Dr. Kassim
Curr Neurol Neurosci Rep
Autonomic Nervous SystemGastroparesisMigraine Disorders
Obesity (Silver Spring)
BetacoronavirusComorbidityCoronavirus Infections
Clin Imaging
Carotid Artery ThrombosisCoronavirus InfectionsCOVID-19
See who Dr. Kassim researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Kassim works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gassan Kassim received $797 in industry payments from 2022 to 2025
CMS Open Payments shows 13 general payments to Dr. Kassim from 7 drug and device companies from 2022 to 2025. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $262.
General payments to Dr. Kassim by program year, 2022 to 2025
Companies that paid Dr. Kassim the most, 2022 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Gassan Kassim'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 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)Doctors and Clinicians Utilization Data (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 |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Gassan Kassim
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. Gassan Kassim's NPI number?
Dr. Gassan Kassim's NPI number is 1396231890. It was assigned on July 8, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Gassan Kassim?
Dr. Gassan Kassim is a gastroenterologist in Phoenix, Arizona. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Gassan Kassim practice?
Dr. Kassim practices at 5777 East Mayo Boulevard, Phoenix, AZ 85054. Dr. Kassim's primary practice is Mayo Clinic Hospital - Phoenix in Phoenix, Arizona, part of Mayo Clinic. Dmand AI also links Dr. Kassim to 2 hospitals.
What is Dr. Gassan Kassim's office phone number?
The practice phone on file for Dr. Kassim is (480) 342-4201.
What is Dr. Gassan Kassim's medical license number?
Dr. Kassim holds Arizona license R78884.
Which hospitals is Dr. Gassan Kassim affiliated with?
Dr. Kassim practices at Mayo Clinic Hospital - Phoenix in Phoenix, Arizona. Dr. Kassim is also affiliated with Barnes-Jewish Hospital. Dmand AI links Dr. Kassim to 2 more hospitals.
What medical group is Dr. Gassan Kassim part of?
Dr. Kassim is linked to WashU Medicine Psychiatry.
Does Dr. Gassan Kassim accept Medicare?
Yes. CMS lists Dr. Kassim as accepting Medicare assignment.
What drugs does Dr. Gassan Kassim prescribe most?
In 2024 Medicare Part D data, Dr. Kassim's most prescribed drugs by claims were Omeprazole, Gavilyte-G and Pantoprazole Sodium.
Has Dr. Gassan Kassim received payments from drug or device companies?
CMS Open Payments shows $797 in general payments to Dr. Kassim from 7 companies from 2022 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
Show 3 more questionsShow fewer questions
How long has Dr. Gassan Kassim been practicing?
Dr. Kassim graduated from medical school in 2016, 10 years ago.
Does Dr. Gassan Kassim do research?
Dmand AI links 6 publications to Dr. Kassim, published from 2020 to 2025.
Who does Dr. Gassan Kassim publish with?
Dr. Kassim's most frequent co-authors are Karissa Nicole Arca, MD (1 shared paper), Jordan Eric Axelrad, MD, MPH (1 shared paper) and Puneet B. Belani, MD (1 shared paper).
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