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DR. GASSAN KASSIM MD
NPI 1396231890
Internal Medicine - Gastroenterology in Saint Louis, MO

Active since July 08, 2018PECOS EnrolledAccepts Medicare Assignment
1 BARNES JEWISH HOSPITAL PLZ, DIV IM GASTROENTEROLOGY, SAINT LOUIS, MO 63110(314) 747-2066(314) 362-2357 Get Directions Write a Review

NPPES record last updated: July 18, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 1, 2021, Jul 8, 2018 (2 updates tracked since 2018).

About Dr. Gassan Kassim Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GASSAN KASSIM MD (NPI 1396231890) is an individual gastroenterology provider in Saint Louis, Missouri, licensed in Missouri (2025016144) and active in the NPI registry since July 2018. He is enrolled in Medicare PECOS, is affiliated with Barnes Jewish Hospital, and is a graduate of Other (2016).

NPPES Registry Identity

NPI1396231890
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. GASSAN KASSIMCredential: MD
Location Address1 BARNES JEWISH HOSPITAL PLZ, DIV IM GASTROENTEROLOGYSaint Louis, MO 63110-1003
Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (314) 747-2066 · Fax (314) 362-2357
Phone(314) 747-2066
Fax(314) 362-2357
Sole ProprietorNo
Medical School CMSOtherGraduated 2016
Enumeration DateJuly 8, 2018
Last NPPES UpdateJuly 18, 20252 updates tracked since enumeration
NPPES CertifiedJuly 1, 2021
✔ NPI 1396231890 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in MO · 2025016144
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Also ListedInternal MedicineTaxonomy 207R00000X · License 2025016144 (MO)
1 BARNES JEWISH HOSPITAL PLZ, Saint Louis, MO 63110
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cox HealthPlans.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Gassan Kassim 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.

PECOS PAC ID2365788536
PECOS Enrollment IDI20250806001044
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Barnes Jewish Hospital

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number260032
LocationOne Barnes-Jewish Hospital PlazaSaint Louis, MO 63110 · St. Louis City County
Emergency services Birthing friendly

Missouri Baptist Medical Center

Acute Care Hospitals · Town And Country, MO
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260108
Location3015 N Ballas RdTown And Country, MO 63131 · St. Louis County
Emergency services Birthing friendly

Barnes-Jewish West County Hospital

Acute Care Hospitals · Creve Coeur, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260162
Location12634 Olive BoulevardCreve Coeur, MO 63141 · St. Louis County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

DR. MARGARET LEIGHTON MCNAIRY MD
Hospitalist
1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST
SAINT LOUIS, MO 63110
St. Louis City (314) 362-1700
ANNA RABINOV ANNA RABINOV
Obstetrics & Gynecology
1 BARNES JEWISH HOSPITAL PLZ
SAINT LOUIS, MO 63110
St. Louis City (314) 747-3000
MRS. MICHELLE MARIE BLOOM ACNP
Nurse Practitioner (Acute Care)
1 BARNES JEWISH HOSPITAL PLZ, DEPT ANESTHESIOLOGY
SAINT LOUIS, MO 63110
St. Louis City (800) 862-9980
DR. FARIS ADAM BAKEER MD
Hospitalist
1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST
SAINT LOUIS, MO 63110
St. Louis City (314) 362-1700
DR. REHAN RAIS MD
Hospitalist
1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST
SAINT LOUIS, MO 63110
St. Louis City (314) 362-1700
DR. RANDY OLIVIER LAINE MD
Hospitalist
1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST
SAINT LOUIS, MO 63110
St. Louis City (314) 362-1700
DR. BRADLEY SETH KUSHNER MD
Surgery
1 BARNES JEWISH HOSPITAL PLZ, DIV SURG VASCULAR
SAINT LOUIS, MO 63110
St. Louis City (314) 273-7373
MS. KELSEY ELISE FOGUS CRNA
Nurse Anesthetist, Certified Registered
1 BARNES JEWISH HOSPITAL PLZ, DEPT ANESTHESIOLOGY
SAINT LOUIS, MO 63110
St. Louis City (800) 862-9980

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 Gassan Kassim's NPI number?

The NPI number for Gassan Kassim is 1396231890. It was assigned to this individual provider in the NPPES registry on July 8, 2018.

Where is Gassan Kassim located?

Gassan Kassim practices at 1 Barnes Jewish Hospital Plz Div Im Gastroenterology, Saint Louis, MO 63110. The listed phone number is (314) 747-2066.

What is Gassan Kassim's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Gassan Kassim enrolled in Medicare?

Yes. Gassan Kassim 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.

What insurance does Gassan Kassim accept?

Health plans from Cox HealthPlans list Gassan Kassim as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Gassan Kassim affiliated with any hospitals?

According to CMS data, Gassan Kassim is affiliated with Barnes Jewish Hospital, Missouri Baptist Medical Center and Barnes-Jewish West County Hospital.

When was this NPI record last updated?

The NPPES record for Gassan Kassim was last updated on July 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.