MR. MUHAMMAD AHMAR SIDDIQUI M.D
NPI 1689824443
Internal Medicine - Nephrology in Dallas, TX
About Mr. Muhammad Ahmar Siddiqui M.d NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. MUHAMMAD AHMAR SIDDIQUI M.D (NPI 1689824443) is an individual nephrology provider in Dallas, Texas, licensed in Texas (N7175) and active in the NPI registry since September 2008. He is enrolled in Medicare PECOS, is affiliated with Texas Health Arlington Memorial Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 5
Secondary Practice Locations 2
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
Mr. Muhammad Ahmar Siddiqui M.d 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
6Medicare enrollment records show Muhammad Siddiqui reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Dallas, TX 75208
- Reassigned Medicare billing, Texas enrollment
- 254 clinicians in this Medicare group
Dallas, TX 75231
- Reassigned Medicare billing, Texas enrollment
- 1,639 clinicians in this Medicare group
Dallas, TX 75230
- Reassigned Medicare billing, Texas enrollment
- 90 clinicians in this Medicare group
Tyler, TX 75702
- Reassigned Medicare billing, Texas enrollment
- 2,745 clinicians in this Medicare group
Longview, TX 75601
- Reassigned Medicare billing, Texas enrollment
- 70 clinicians in this Medicare group
San Antonio, TX 78229
- Reassigned Medicare billing, Texas enrollment
- 33 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 5
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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Texas Health Arlington Memorial Hospital
Acute Care Hospitals · Arlington, TXChristus Mother Frances Hospital
Acute Care Hospitals · Tyler, TXMethodist Mansfield Medical Center
Acute Care Hospitals · Mansfield, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 75208 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
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.
DALLAS, TX 75208
DALLAS, TX 75208
DALLAS, TX 75208
DALLAS, TX 75208
DALLAS, TX 75208
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 Muhammad Siddiqui's NPI number?
The NPI number for Muhammad Siddiqui is 1689824443. It was assigned to this individual provider in the NPPES registry on September 29, 2008.
Where is Muhammad Siddiqui located?
Muhammad Siddiqui practices at 221 W Colorado Blvd Ste 525, Dallas, TX 75208. The listed phone number is (214) 960-5681.
What is Muhammad Siddiqui's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Muhammad Siddiqui enrolled in Medicare?
Yes. Muhammad Siddiqui 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 Muhammad Siddiqui's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Muhammad Siddiqui reassigns Medicare benefits to 6 organizations: Dallas Pulmonary & Critical Care PA (Dallas, TX), Texas Health Physicians Group (Dallas, TX), Questcare Intensivists PLLC (Dallas, TX), Christus Trinity Clinic Texas (Tyler, TX), Northeast Texas Intensivists, PLLC (Longview, TX) and 1 more organization, listed in the Medicare section above. 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 Muhammad Siddiqui's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Muhammad Siddiqui 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 6 other insurers list Muhammad Siddiqui 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 Muhammad Siddiqui affiliated with any hospitals?
According to CMS data, Muhammad Siddiqui is affiliated with Texas Health Arlington Memorial Hospital, Christus Mother Frances Hospital and Methodist Mansfield Medical Center.
When was this NPI record last updated?
The NPPES record for Muhammad Siddiqui was last updated on June 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Mr. Muhammad Ahmar Siddiqui, M.D · NPI 1689824443
Nephrology physician in Dallas, Texas. Individual provider, active in the CMS NPPES registry since September 29, 2008.
## Identity
- **NPI:** 1689824443 (Entity type: Individual)
- **Enumerated:** September 29, 2008
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** N7175 (Texas)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 221 W COLORADO BLVD STE 525, Dallas, TX 75208-2312
- **Phone:** (214) 960-5681 · **Fax:** (214) 960-5681
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Dallas Pulmonary & Critical Care PA (NPI 1235402728, Dallas, TX); Texas Health Physicians Group (NPI 1053767897, Dallas, TX); Questcare Intensivists PLLC (NPI 1669797387, Dallas, TX); Christus Trinity Clinic Texas (NPI 1285684225, Tyler, TX); Northeast Texas Intensivists, PLLC (NPI 1497536676, Longview, TX); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** June 10, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1689824443) · Data from the CMS NPPES public registry.