NADIA HAJ-ISMAIL
NPI 1043743727
Internal Medicine in Houston, TX
About Nadia Haj-ismail NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NADIA HAJ-ISMAIL (NPI 1043743727) is an individual internal medicine provider in Houston, Texas, licensed in Texas (R9975) and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS, is affiliated with Harris Health System, and maintains a secondary practice location in Houston.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Accepted Insurance
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
Nadia Haj-ismail 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
2Medicare enrollment records show Nadia Haj-ismail reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Houston, TX 77030
- Reassigned Medicare billing, Texas enrollment
- 3,111 clinicians in this Medicare group
Houston, TX 77030
- Reassigned Medicare billing, Texas enrollment
- 2,554 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.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Harris Health System
Acute Care Hospitals · Houston, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 77026 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.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
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 Nadia Haj-ismail's NPI number?
The NPI number for Nadia Haj-ismail is 1043743727. It was assigned to this individual provider in the NPPES registry on April 9, 2017.
Where is Nadia Haj-ismail located?
Nadia Haj-ismail practices at 5656 Kelley St, Houston, TX 77026. The listed phone number is (713) 566-4489.
What is Nadia Haj-ismail's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Nadia Haj-ismail enrolled in Medicare?
Yes. Nadia Haj-ismail 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 Nadia Haj-ismail's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nadia Haj-ismail reassigns Medicare benefits to 2 organizations: Ut Physicians (Houston, TX) and Baylor College Of Medicine (Houston, TX). 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 Nadia Haj-ismail's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nadia Haj-ismail accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 1 other insurer list Nadia Haj-ismail 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 Nadia Haj-ismail affiliated with any hospitals?
According to CMS data, Nadia Haj-ismail is affiliated with Harris Health System.
When was this NPI record last updated?
The NPPES record for Nadia Haj-ismail was last updated on September 17, 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.
# Nadia Haj-Ismail · NPI 1043743727
Internal Medicine physician in Houston, Texas. Individual provider, active in the CMS NPPES registry since April 9, 2017.
## Identity
- **NPI:** 1043743727 (Entity type: Individual)
- **Enumerated:** April 9, 2017
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** R9975 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 5656 KELLEY ST, Houston, TX 77026-1967
- **Phone:** (713) 566-4489
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Ut Physicians (NPI 1033157821, Houston, TX); Baylor College Of Medicine (NPI 1881026664, Houston, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Texas Medical School At Houston, class of 2017
## Record status
- **NPPES last updated:** September 17, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1043743727) · Data from the CMS NPPES public registry.