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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

MAHMOUD HASSANEIN
NPI 1023937877
Internal Medicine in Saint Louis, MO

Active since July 14, 2026PECOS Enrolled
1201 S GRAND BLVD, SAINT LOUIS, MO 63104(314) 257-8000 Get Directions Write a Review

NPPES record added: July 15, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

About Mahmoud Hassanein NPPES

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

MAHMOUD HASSANEIN (NPI 1023937877) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2026021987) and active in the NPI registry since July 2026. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1023937877
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMAHMOUD HASSANEIN
Location Address1201 S GRAND BLVDSaint Louis, MO 63104-1016
Mailing Address3853 Lindell Blvd Apt 303Saint Louis, MO 63108-3432
Phone(314) 257-8000
Sole ProprietorNo
Enumeration DateJuly 14, 2026
Last NPPES UpdateJuly 15, 2026
NPPES CertifiedJuly 15, 2026
✔ NPI 1023937877 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MO · 2026021987
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
1201 S GRAND BLVD, Saint Louis, MO 63104
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mahmoud Hassanein is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63104 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.

DOUG LONGO APRN
Nurse Practitioner (Acute Care)
1201 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 257-8000
JOHN JOSEPH HOUSER
Student in an Organized Health Care Education/Training Program
1201 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 257-8000
NABIHA NOOR SHAMSHUDDIN MD
Hospitalist
1201 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 257-8000
AMAN PATEL
Student in an Organized Health Care Education/Training Program
1201 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 257-8000
MS. KEELEY FERRELL RYAN PA-C
Physician Assistant
1201 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 257-1320
PATRICK SWEENEY
Student in an Organized Health Care Education/Training Program
1201 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 257-8000
DR. SHAMEELA NASRULLAH KHIMANI MD
Pediatrics
1201 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 617-3239
IBRAHIM SHAMASNEH M.D.
Hospitalist
1201 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 617-2000

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 Mahmoud Hassanein's NPI number?

The NPI number for Mahmoud Hassanein is 1023937877. It was assigned to this individual provider in the NPPES registry on July 14, 2026.

Where is Mahmoud Hassanein located?

Mahmoud Hassanein practices at 1201 S Grand Blvd, Saint Louis, MO 63104. The listed phone number is (314) 257-8000.

What is Mahmoud Hassanein's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mahmoud Hassanein enrolled in Medicare?

Yes. Mahmoud Hassanein is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Mahmoud Hassanein was last updated on July 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 48 days 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.