Dr. Ofer Z. Fass, MD
- Medicare patients, 2024
- 19
- Part D claims, 2024
- 21
- Publications
- 15
- MIPS score, 2024
- 95
- Hospital affiliations
- 3
- Practice address
- 251 E Huron St, Chicago, IL 60611
- Practice phone
- Call (312) 926-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Fass' 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. Ofer Z. Fass is a gastroenterologist in Chicago, Illinois
Dr. Fass practices at Northwestern Memorial Hospital in Chicago, Illinois, part of Northwestern Memorial HealthCare.
Dr. Fass' NPI, 1154856714, was assigned on April 20, 2017. Dr. Fass graduated from Harvard Medical School in 2017. Dr. Fass holds Illinois license 036170527.
- NPI
- 1154856714NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5294073862
- NPI enumeration date
- April 20, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (312) 926-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ofer Z. Fass practices at Northwestern Memorial Hospital in Chicago, Illinois
Dr. Fass' primary practice is Northwestern Memorial Hospital, at 251 E Huron St, Chicago, IL 60611 in Cook County. The practice phone is (312) 926-2000.
- Northwestern Memorial Hospital251 E Huron St, Chicago, IL 60611 · Cook CountyPhone(312) 926-2000
Source: Dmand AI Affiliation Data
Dr. Ofer Z. Fass is affiliated with 4 sites of care and 2 medical groups
Dr. Fass' primary practice is Northwestern Memorial Hospital in Chicago, Illinois, part of Northwestern Memorial HealthCare. Dr. Fass is also affiliated with Tisch Hospital. The medical group on file is Northwestern Medical Faculty Foundation. Dmand AI also links Dr. Fass to 1 more hospital, 1 group practice or clinic and 1 medical group, 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. Ofer Z. Fass' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Fass practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwestern Memorial Hospital | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Northwestern Memorial HealthCare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Ofer Z. Fass is one of 771 gastroenterologists in Illinois
Gastroenterology is Dr. Fass' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dmand AI has Dr. Fass' licenses on file in 2 states: Illinois and New York.
Specialties and state licenses
- Gastroenterology, IllinoisPrimary
- Internal medicine, New York
Gastroenterologists near Dr. Fass
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Ofer Z. Fass treated 19 Medicare patients in 2024, average age 71
CMS counts 19 Medicare patients who saw Dr. Fass in 2024. 68% of them have high blood pressure, and 58% have high cholesterol. Their average risk score is 0.84, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Fass' median patient age at 72, with 60% women.
Chronic conditions among Dr. Fass' Medicare patients, 2024
- High blood pressure68%
- High cholesterol58%
Share of Medicare patients with each condition. A patient can have several.
Dr. Fass' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women60%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Ofer Z. Fass wrote 21 Medicare Part D claims in 2024
In 2024, Dr. Fass wrote 21 Medicare Part D claims for 17 patients. 95% of them were for generic drugs. CMS names the drug for 13 of them, across 1 drug with 11 or more claims each, at $103 in total drug cost. In 2018, CMS named 13 claims across 1 drug.
Dr. Fass' Part D claims by kind of drug, 2024
- Generic20 claims95%
- Brand-name and other1 claims5%
Dr. Fass' most prescribed drugs by claims, 2019
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, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 132019: 13No change
Drugs named by CMS: 1 in 2019, 1 in 2018.
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. Ofer Z. Fass scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Fass for performance year 2024, reported through an alternative payment model (APM). Dr. Fass accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Fass as offering telehealth. CMS counts 72 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Fass, more than 70% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Fass' MIPS scores, performance year 2024
- 95of 100Final score
- 83of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Fass ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 70th percentile72 procedures
- Colonoscopy
- 48th percentile21 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Ofer Z. Fass has 15 publications on record
Dmand AI links 15 papers to Dr. Fass, published from 2014 to 2025. 2025 was the busiest year, with 4. The most frequent topics are Manometry, Esophageal Achalasia and Gastroesophageal Reflux. Dr. Fass has published most often in Neurogastroenterol Motil. Dr. Fass' most frequent co-authors are Dustin A. Carlson, MD, Ronnie Fass, MD and John E. Pandolfino, MD.
Dr. Fass' papers by year, 2014 to 2025
Topics Dr. Fass writes about most
- Manometry
- Esophageal Achalasia
- Gastroesophageal Reflux
- Esophagogastric Junction
- Esophagus
- Deglutition Disorders
- Eosinophilic Esophagitis
- Esophageal Motility Disorders
Dr. Fass' most frequent co-authors
- Dustin A. Carlson, MD4 shared papers
- Ronnie Fass, MD3 shared papers
- John E. Pandolfino, MD3 shared papers
Recent publications by Dr. Fass
Neurogastroenterol Motil
Gastrointest Endosc Clin N Am
Neurogastroenterol Motil
See who Dr. Fass researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Fass 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. Ofer Z. Fass received $5,320 in industry payments from 2021 to 2025
CMS Open Payments shows 21 general payments to Dr. Fass from 6 drug and device companies from 2021 to 2025. Consulting fees make up the largest share, 61% of the total. CapsoVision, Inc. paid the most, $3,233.
General payments to Dr. Fass by program year, 2021 to 2025
General payments to Dr. Fass by kind, 2021 to 2025
- Consulting fees$3,23361%
- Food and beverage$2,08739%
Companies that paid Dr. Fass the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ofer Z. Fass graduated from Harvard Medical School
Dr. Fass graduated from Harvard Medical School in 2017.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Ofer Z. Fass'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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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)Clinician Public Reporting: Overall MIPS Performance (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) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Ofer Z. Fass
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. Ofer Z. Fass' NPI number?
Dr. Ofer Z. Fass' NPI number is 1154856714. It was assigned on April 20, 2017, and it is active in the NPI Registry.
What kind of doctor is Dr. Ofer Z. Fass?
Dr. Ofer Z. Fass is a gastroenterologist in Chicago, Illinois. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Ofer Z. Fass practice?
Dr. Fass practices at 251 E Huron St, Chicago, IL 60611. Dr. Fass' primary practice is Northwestern Memorial Hospital in Chicago, Illinois, part of Northwestern Memorial HealthCare. Dmand AI also links Dr. Fass to 1 hospital, 1 group practice or clinic and 1 medical group.
What is Dr. Ofer Z. Fass' office phone number?
The practice phone on file for Dr. Fass is (312) 926-2000.
What is Dr. Ofer Z. Fass' medical license number?
Dr. Fass holds Illinois license 036170527, one of the licenses on file in 2 states.
Which states has Dr. Ofer Z. Fass been licensed in?
Dmand AI has state licenses on file for Dr. Fass in Illinois and New York.
Which hospitals is Dr. Ofer Z. Fass affiliated with?
Dr. Fass practices at Northwestern Memorial Hospital in Chicago, Illinois. Dr. Fass is also affiliated with Tisch Hospital. Dmand AI links Dr. Fass to 1 more hospital.
What medical group is Dr. Ofer Z. Fass part of?
Dr. Fass is linked to Northwestern Medical Faculty Foundation. Dmand AI links Dr. Fass to 1 more medical group.
Does Dr. Ofer Z. Fass accept Medicare?
Yes. CMS lists Dr. Fass as accepting Medicare assignment.
Does Dr. Ofer Z. Fass offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Fass as offering telehealth services.
Show 8 more questionsShow fewer questions
What is Dr. Ofer Z. Fass' MIPS score?
Dr. Fass' MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Ofer Z. Fass see?
CMS counts 19 Medicare patients who saw Dr. Fass in 2024, with an average age of 71.
Where did Dr. Ofer Z. Fass go to medical school?
Dr. Fass graduated from Harvard Medical School in 2017.
What drugs does Dr. Ofer Z. Fass prescribe most?
In 2019 Medicare Part D data, Dr. Fass' most prescribed drugs by claims were Atorvastatin Calcium.
Has Dr. Ofer Z. Fass received payments from drug or device companies?
CMS Open Payments shows $5,320 in general payments to Dr. Fass from 6 companies from 2021 to 2025. The largest total came from CapsoVision, Inc.
How long has Dr. Ofer Z. Fass been practicing?
Dr. Fass graduated from medical school in 2017, 9 years ago.
Does Dr. Ofer Z. Fass do research?
Dmand AI links 15 publications to Dr. Fass, published from 2014 to 2025.
Who does Dr. Ofer Z. Fass publish with?
Dr. Fass' most frequent co-authors are Dustin A. Carlson, MD (4 shared papers), Ronnie Fass, MD (3 shared papers) and John E. Pandolfino, MD (3 shared papers).
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