STEVEN SIEMIENIAK DO
NPI 1659965598
Emergency Medicine in Jbsa Lackland, TX
About Steven Siemieniak Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEVEN SIEMIENIAK DO (NPI 1659965598) is an individual emergency medicine provider in Jbsa Lackland, Texas, licensed in Virginia (0102207565) and active in the NPI registry since February 2021. He is enrolled in Medicare PECOS, is affiliated with Methodist Hospital, and maintains a secondary practice location in Jbsa Ft Sam Houston.
NPPES Registry Identity
Specialties & Licenses
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
Steven Siemieniak Do 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 Reassignment
Medicare enrollment records show Steven Siemieniak reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Antonio, TX 78229
- Reassigned Medicare billing, Texas enrollment
- 1,452 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Methodist Hospital
Acute Care Hospitals · San Antonio, TXMethodist Hospital Stone Oak
Acute Care Hospitals · San Antonio, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 78236 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 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
JBSA LACKLAND, TX 78236
JBSA LACKLAND, TX 78236
JBSA LACKLAND, TX 78236
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 Steven Siemieniak's NPI number?
The NPI number for Steven Siemieniak is 1659965598. It was assigned to this individual provider in the NPPES registry on February 22, 2021.
Where is Steven Siemieniak located?
Steven Siemieniak practices at 1100 Wilford Hall Loop # 4554, Jbsa Lackland, TX 78236. The listed phone number is (210) 292-7412.
What is Steven Siemieniak's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Steven Siemieniak enrolled in Medicare?
Yes. Steven Siemieniak 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 organization bills Medicare for Steven Siemieniak's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Steven Siemieniak reassigns Medicare benefits to Emergency Medicine Services Of Tx, PLLC (San Antonio, TX). The 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 Steven Siemieniak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Steven Siemieniak accept?
Health plans from Blue Cross and Blue Shield of Texas, Oscar Insurance Company and UnitedHealthcare list Steven Siemieniak 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 Steven Siemieniak affiliated with any hospitals?
According to CMS data, Steven Siemieniak is affiliated with Methodist Hospital and Methodist Hospital Stone Oak.
When was this NPI record last updated?
The NPPES record for Steven Siemieniak was last updated on June 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Steven Siemieniak, DO · NPI 1659965598
Emergency Medicine physician in Jbsa Lackland, Texas. Individual provider, active in the CMS NPPES registry since February 22, 2021.
## Identity
- **NPI:** 1659965598 (Entity type: Individual)
- **Enumerated:** February 22, 2021
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 0102207565 (Virginia)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1100 WILFORD HALL LOOP # 4554, Jbsa Lackland, TX 78236-5638
- **Phone:** (210) 292-7412
## 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:** Emergency Medicine Services Of Tx, PLLC (NPI 1245938729, San Antonio, TX), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** June 26, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1659965598) · Data from the CMS NPPES public registry.