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
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Methodist Hospital
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 3
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.
Is Steven Siemieniak affiliated with any hospitals?
According to CMS data, Steven Siemieniak is affiliated with Methodist Hospital.
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 43 days 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
- **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.