DR. MARK A STILLEY MD
NPI 1336109818
Emergency Medicine in El Paso, TX
About Dr. Mark A Stilley Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK A STILLEY MD (NPI 1336109818) is an individual emergency medicine provider in El Paso, Texas, licensed in Texas (J6041) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with U S M D Hospital At Arlington L P, and is a graduate of University Of Texas Medical School At Houston (1993).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 6
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
Dr. Mark A Stilley 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
5Medicare enrollment records show Mark Stilley reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
El Paso, TX 79902
- Reassigned Medicare billing, Texas enrollment
- 5,299 clinicians in this Medicare group
Plainview, TX 79072
- Reassigned Medicare billing, Texas enrollment
- 217 clinicians in this Medicare group
Fort Worth, TX 76112
- Reassigned Medicare billing, Texas enrollment
- 545 clinicians in this Medicare group
Gainesville, TX 76240
- Reassigned Medicare billing, Texas enrollment
- 1,193 clinicians in this Medicare group
Texarkana, TX 75503
- Reassigned Medicare billing, Texas enrollment
- 128 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
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.
U S M D Hospital At Arlington L P
Acute Care Hospitals · Arlington, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 79925 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
EL PASO, TX 79925
EL PASO, TX 79925
EL PASO, TX 79925
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 Mark Stilley's NPI number?
The NPI number for Mark Stilley is 1336109818. It was assigned to this individual provider in the NPPES registry on March 27, 2006.
Where is Mark Stilley located?
Mark Stilley practices at 10301 Gateway Blvd W, El Paso, TX 79925. The listed phone number is (915) 595-9000.
What is Mark Stilley's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Mark Stilley enrolled in Medicare?
Yes. Mark Stilley 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 Mark Stilley's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Stilley reassigns Medicare benefits to 5 organizations: University Of Texas Southwestern Medical Center At Dallas (El Paso, TX), Hospitalist Medicine Physicians Of Texas - Houston, PLLC (Plainview, TX), Texas Medicine Resources, LLP (Fort Worth, TX), Acs Primary Care Physicians Southwest, PA (Gainesville, TX) and Union Emergency Physicians, PLLC (Texarkana, 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 Mark Stilley's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Stilley accept?
Health plans from Blue Cross and Blue Shield of Texas and CHRISTUS Health Plan list Mark Stilley 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 Mark Stilley affiliated with any hospitals?
According to CMS data, Mark Stilley is affiliated with U S M D Hospital At Arlington L P.
When was this NPI record last updated?
The NPPES record for Mark Stilley was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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. Mark A Stilley, MD · NPI 1336109818
Emergency Medicine physician in El Paso, Texas. Individual provider, active in the CMS NPPES registry since March 27, 2006.
## Identity
- **NPI:** 1336109818 (Entity type: Individual)
- **Enumerated:** March 27, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** J6041 (Texas)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 10301 GATEWAY BLVD W, El Paso, TX 79925-7701
- **Phone:** (915) 595-9000
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): University Of Texas Southwestern Medical Center At Dallas (NPI 1235384199, El Paso, TX); Hospitalist Medicine Physicians Of Texas - Houston, PLLC (NPI 1760028740, Plainview, TX); Texas Medicine Resources, LLP (NPI 1376581900, Fort Worth, TX); Acs Primary Care Physicians Southwest, PA (NPI 1538101019, Gainesville, TX); Union Emergency Physicians, PLLC (NPI 1023798501, Texarkana, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Texas Medical School At Houston, class of 1993
## Record status
- **NPPES last updated:** July 8, 2007
- **Other identifiers:** Other P00323514 (TX); Medicare UPIN F87413 (TX); Medicaid 40674827 (NM); and 3 more
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Source: [NPI Profile](https://npiprofile.com/npi/1336109818) · Data from the CMS NPPES public registry.