Dr. Youssef Assioun, MD
- Medicare services, 2024
- 448
- Medicare patients, 2024
- 263
- Part D claims, 2024
- 1,035
- Hospital affiliations
- 3
- Industry payments
- $7,345
- Practice address
- 10010 Kennerly Road, Saint Louis, MO 63128
- Practice phone
- Call (314) 525-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Assioun'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. Youssef Assioun is a gastroenterologist in Saint Louis, Missouri
Dr. Assioun practices at Mercy Hospital South in Saint Louis, Missouri, part of Mercy.
Dr. Assioun's NPI, 1639370919, was assigned on May 31, 2007. Dr. Assioun holds Missouri license 2010006463.
- NPI
- 1639370919NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2860654423
- NPI enumeration date
- May 31, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (314) 525-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Youssef Assioun practices at Mercy Hospital South in Saint Louis, Missouri
Dr. Assioun's primary practice is Mercy Hospital South, at 10010 Kennerly Road, Saint Louis, MO 63128 in St. Louis County. The practice phone is (314) 525-1000.
- Mercy Hospital South10010 Kennerly Road, Saint Louis, MO 63128 · St. Louis CountyPhone(314) 525-1000
Source: Dmand AI Affiliation Data
Dr. Youssef Assioun is affiliated with 5 sites of care and 2 medical groups
Dr. Assioun's primary practice is Mercy Hospital South in Saint Louis, Missouri, part of Mercy. Dr. Assioun is also affiliated with Mercy Hospital St. Louis. The medical group on file is Mercy Clinic Gastroenterology. Dmand AI also links Dr. Assioun to 1 more hospital, 2 group practices and clinics 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. Youssef Assioun's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Assioun practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercy Hospital South | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Youssef Assioun is one of 329 gastroenterologists in Missouri
Gastroenterology is Dr. Assioun's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Assioun is licensed in Missouri.
Specialties and state licenses
- Gastroenterology, MissouriPrimary
Gastroenterologists near Dr. Assioun
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. Youssef Assioun billed Medicare for 448 services in 2024
CMS data shows 448 Medicare services from Dr. Assioun across 14 procedure codes in 2024, for 263 Medicare patients. Medicare paid $49,934 for them.
Dr. Assioun's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 2592024: 2369%
- Office and hospital visits
- 2023: 2802024: 18434%
- Other services
- 2023: 312024: 1552%
- Tests and treatments
- 2023: 122024: 138%
Where Dr. Assioun's Medicare services took place, 2024
- In an office7517%
- In a facility37383%
Dr. Assioun compared with the Missouri median for gastroenterologists, 2024
- Dr. Assioun
- Missouri median
- Medicare services
- 448vs 4168% above
- Medicare patients
- 263vs 29611% below
- Part D claims
- 901vs 4342.1 times
Medians across 337 gastroenterologists in Missouri with Dmand AI profiles that report each measure.
Dr. Assioun's most billed Medicare procedure codes, 2024
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. Assioun?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Assioun and other gastroenterologists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Youssef Assioun treated 263 Medicare patients in 2024, average age 74
CMS counts 263 Medicare patients who saw Dr. Assioun in 2024. The largest group is 65 to 74, with 104 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 19% are also on Medicaid. Their average risk score is 2.12, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Assioun's median patient age at 69, with 53% women.
Dr. Assioun's Medicare patients by age, 2024
Dr. Assioun's Medicare patients by sex, 2024
- Women14354%
- Men12046%
Chronic conditions among Dr. Assioun's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Ischemic heart disease48%
- Anxiety46%
- Mood disorders46%
- Chronic kidney disease43%
- Depression42%
Share of Medicare patients with each condition. A patient can have several.
Dr. Assioun's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Youssef Assioun wrote 1,035 Medicare Part D claims in 2024
In 2024, Dr. Assioun wrote 1,035 Medicare Part D claims for 483 patients. 82% of them were for generic drugs. CMS names the drug for 901 of them, across 14 drugs with 11 or more claims each, at $57,260 in total drug cost. In 2023, CMS named 819 claims across 12 drugs.
Dr. Assioun's Part D claims by kind of drug, 2024
- Generic852 claims82%
- Brand-name183 claims18%
Dr. Assioun'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.
Drug classes CMS tracks in Dr. Assioun's Part D claims, 2024
- Antibiotics1%15 of 1,035 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8192024: 90110%
Drugs named by CMS: 14 in 2024, 12 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. Youssef Assioun ranks in the 85th percentile for upper gastrointestinal (gi) endoscopy for acid reflux in Medicare
Dr. Assioun accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 153 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Assioun, more than 85% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Assioun ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 85th percentile153 procedures
- Colonoscopy
- 83rd percentile118 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. Youssef Assioun received $7,345 in industry payments from 2016 to 2025
CMS Open Payments shows 289 general payments to Dr. Assioun from 39 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $1,795.
General payments to Dr. Assioun by program year, 2016 to 2025
General payments to Dr. Assioun by kind, 2016 to 2025
- Food and beverage$7,339100%
- Education$70%
Companies that paid Dr. Assioun the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Youssef Assioun'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 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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| 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. Youssef Assioun
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. Youssef Assioun's NPI number?
Dr. Youssef Assioun's NPI number is 1639370919. It was assigned on May 31, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Youssef Assioun?
Dr. Youssef Assioun is a gastroenterologist in Saint Louis, Missouri. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Youssef Assioun practice?
Dr. Assioun practices at 10010 Kennerly Road, Saint Louis, MO 63128. Dr. Assioun's primary practice is Mercy Hospital South in Saint Louis, Missouri, part of Mercy. Dmand AI also links Dr. Assioun to 1 hospital, 2 group practices and clinics and 1 medical group.
What is Dr. Youssef Assioun's office phone number?
The practice phone on file for Dr. Assioun is (314) 525-1000.
What is Dr. Youssef Assioun's medical license number?
Dr. Assioun holds Missouri license 2010006463.
Which hospitals is Dr. Youssef Assioun affiliated with?
Dr. Assioun practices at Mercy Hospital South in Saint Louis, Missouri. Dr. Assioun is also affiliated with Mercy Hospital St. Louis. Dmand AI links Dr. Assioun to 1 more hospital.
What medical group is Dr. Youssef Assioun part of?
Dr. Assioun is linked to Mercy Clinic Gastroenterology. Dmand AI links Dr. Assioun to 1 more medical group.
Does Dr. Youssef Assioun accept Medicare?
Yes. CMS data shows Dr. Assioun billed Medicare for 448 services in 2024, and Dr. Assioun accepts Medicare assignment.
How many Medicare patients does Dr. Youssef Assioun see?
CMS counts 263 Medicare patients who saw Dr. Assioun in 2024, with an average age of 74.
What services does Dr. Youssef Assioun bill to Medicare?
In 2024, Dr. Assioun's most billed Medicare services were surgery: digestive system (43239), surgery: digestive system (45385) and surgery: digestive system (45380).
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What drugs does Dr. Youssef Assioun prescribe most?
In 2024 Medicare Part D data, Dr. Assioun's most prescribed drugs by claims were Gavilyte-G, Omeprazole and Pantoprazole Sodium.
Has Dr. Youssef Assioun received payments from drug or device companies?
CMS Open Payments shows $7,345 in general payments to Dr. Assioun from 39 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Youssef Assioun been practicing?
Dr. Assioun graduated from medical school in 2003, 23 years ago.
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