DR. GEHAN WALID MAHMOUD MD
NPI 1548845399
Internal Medicine in Staten Island, NY

Q: What is Gehan Mahmoud's NPI number?

The NPI number for Gehan Mahmoud is 1548845399. It was assigned to this individual provider in the NPPES registry on March 12, 2021.

Q: What is Gehan Mahmoud's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Gehan Mahmoud was last updated on January 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.

Active since March 12, 2021PECOS EnrolledAccepts Medicare Assignment

475 SEAVIEW AVE, STATEN ISLAND, NY 10305(717) 226-6902 Get Directions Write a Review

NPPES record last updated: January 15, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jan 15, 2026, Mar 26, 2025, Mar 12, 2021 (3 updates tracked since 2021).

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About Dr. Gehan Walid Mahmoud Md NPPES

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

DR. GEHAN WALID MAHMOUD MD (NPI 1548845399) is an individual internal medicine provider in Staten Island, New York, licensed in New York (335062) and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS, is affiliated with Staten Island University Hospital, and maintains a secondary practice location in Staten Island.

NPPES Registry Identity

NPI1548845399

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameDR. GEHAN WALID MAHMOUDCredential: MD

Location Address475 SEAVIEW AVEStaten Island, NY 10305-3436

Mailing Address375 Seguine AveStaten Island, NY 10309-3932 · (718) 226-6902

Phone(717) 226-6902

Sole ProprietorNo

Medical School CMSOtherGraduated 2020

Enumeration DateMarch 12, 2021

Last NPPES UpdateJanuary 15, 20263 updates tracked since enumeration

NPPES CertifiedJanuary 15, 2026

✔ NPI 1548845399 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in NY · 335062

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.

475 SEAVIEW AVE, Staten Island, NY 10305

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Secondary Practice Location 1

Location 1375 Seguine AveStaten Island, NY 10309-3932 · Phone (718) 226-6902 ext. 17230

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. Gehan Walid Mahmoud 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 ID4789176108

PECOS Enrollment IDI20251124001336

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

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

Staten Island University Hospital

Acute Care Hospitals · Staten Island, NY

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number330160

Location475 Seaview AvenueStaten Island, NY 10305 · Richmond County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10305 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

$154.28 typical visit price

range $67.40 – $203.53

Typical copayment $38.57 (range $16.85 – $50.88)

Most-billed visit code 99204

Established Patient

$117.62 typical visit price

range $21.66 – $164.45

Typical copayment $29.40 (range $5.41 – $41.11)

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.

MRS. DAWN MARIE COTTONE RPA-C

Physician Assistant (Surgical)