DR. SIHAM MOHIELDIN MAHGOUB MD
NPI 1194834754
Internal Medicine - Infectious Disease in Williamsburg, VA
About Dr. Siham Mohieldin Mahgoub Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SIHAM MOHIELDIN MAHGOUB MD (NPI 1194834754) is an individual infectious disease provider in Williamsburg, Virginia, licensed in Virginia (0101239997) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (1991).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 3
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Siham Mohieldin Mahgoub 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.
Medicare Billing Reassignments
3Medicare enrollment records show Siham Mahgoub reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Norfolk, VA 23502
- Reassigned Medicare billing, Virginia enrollment
- 1,901 clinicians in this Medicare group
Charlottesville, VA 22911
- Reassigned Medicare billing, Virginia enrollment
- 307 clinicians in this Medicare group
Washington, DC 20060
- Reassigned Medicare billing, District of Columbia enrollment
- 319 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 23188 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WILLIAMSBURG, VA 23188
WILLIAMSBURG, VA 23188
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 Siham Mahgoub's NPI number?
The NPI number for Siham Mahgoub is 1194834754. It was assigned to this individual provider in the NPPES registry on August 29, 2006.
Where is Siham Mahgoub located?
Siham Mahgoub practices at 400 Sentara Cir Ste 201B, Williamsburg, VA 23188. The listed phone number is (757) 345-4655.
What is Siham Mahgoub's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Siham Mahgoub enrolled in Medicare?
Yes. Siham Mahgoub 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.
Which organizations bill Medicare for Siham Mahgoub's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Siham Mahgoub reassigns Medicare benefits to 3 organizations: Sentara Medical Group (Norfolk, VA), Martha Jefferson Medical Group LLC (Charlottesville, VA) and Howard University (Washington, DC). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Siham Mahgoub's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Siham Mahgoub was last updated on January 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Dr. Siham Mohieldin Mahgoub, MD · NPI 1194834754
Infectious Disease physician in Williamsburg, Virginia. Individual provider, active in the CMS NPPES registry since August 29, 2006.
## Identity
- **NPI:** 1194834754 (Entity type: Individual)
- **Enumerated:** August 29, 2006
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** 0101239997 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 400 SENTARA CIR STE 201B, Williamsburg, VA 23188-5716
- **Phone:** (757) 345-4655 · **Fax:** (757) 390-4892
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Sentara Medical Group (NPI 1265485270, Norfolk, VA); Martha Jefferson Medical Group LLC (NPI 1275720559, Charlottesville, VA); Howard University (NPI 1033163597, Washington, DC) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1991
## Record status
- **NPPES last updated:** January 6, 2026
- **Other identifiers:** Medicaid 02224422 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1194834754) · Data from the CMS NPPES public registry.