DR. STEVEN EUGENE WALKER MD
NPI 1649465584
Internal Medicine in San Antonio, TX
About Dr. Steven Eugene Walker Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEVEN EUGENE WALKER MD (NPI 1649465584) is an individual internal medicine provider in San Antonio, Texas, licensed in Texas (M7735) and active in the NPI registry since September 2007. He is enrolled in Medicare PECOS, is affiliated with Memorial Hermann Memorial City Hospital, and maintains 7 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 7
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. Steven Eugene Walker 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
9Medicare enrollment records show Steven Walker reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Antonio, TX 78216
- Reassigned Medicare billing, Texas enrollment
- 688 clinicians in this Medicare group
Fulshear, TX 77441
- Reassigned Medicare billing, Texas enrollment
- 1,235 clinicians in this Medicare group
Tomball, TX 77375
- Reassigned Medicare billing, Texas enrollment
- 4 clinicians in this Medicare group
Irving, TX 75063
- Reassigned Medicare billing, Texas enrollment
- 29 clinicians in this Medicare group
Westminster, CO 80031
- Reassigned Medicare billing, Colorado enrollment
- 8 clinicians in this Medicare group
Indianapolis, IN 46214
- Reassigned Medicare billing, Indiana enrollment
- 7 clinicians in this Medicare group
West Allis, WI 53214
- Reassigned Medicare billing, Wisconsin enrollment
- 20 clinicians in this Medicare group
Saint Paul, MN 55114
- Reassigned Medicare billing, Minnesota enrollment
- 7 clinicians in this Medicare group
Portland, OR 97239
- Reassigned Medicare billing, Oregon enrollment
- 7 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Memorial Hermann Memorial City Hospital
Acute Care Hospitals · Houston, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 78258 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.
Reported Quality Measures
Other Providers at the Same Location NPPES 13
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN ANTONIO, TX 78258
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 Walker's NPI number?
The NPI number for Steven Walker is 1649465584. It was assigned to this individual provider in the NPPES registry on September 13, 2007.
Where is Steven Walker located?
Steven Walker practices at 300 E Sonterra Blvd, San Antonio, TX 78258. The listed phone number is (855) 425-1055.
What is Steven Walker's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Steven Walker enrolled in Medicare?
Yes. Steven Walker 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 Steven Walker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Steven Walker reassigns Medicare benefits to 9 organizations: Ipc Healthcare Services Of Texas, PLLC (San Antonio, TX), Memorial Hermann Medical Group (Fulshear, TX), Tomagwa Ministries, Inc (Tomball, TX), Seasons Medical Group Of Texas, PLLC (Irving, TX), Seasons Medical Group Of Colorado, PC (Westminster, CO) and 4 more organizations, 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 Steven Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Steven Walker accept?
Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 3 other insurers list Steven Walker 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 Walker affiliated with any hospitals?
According to CMS data, Steven Walker is affiliated with Memorial Hermann Memorial City Hospital.
When was this NPI record last updated?
The NPPES record for Steven Walker was last updated on December 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Dr. Steven Eugene Walker, MD · NPI 1649465584
Internal Medicine physician in San Antonio, Texas. Individual provider, active in the CMS NPPES registry since September 13, 2007.
## Identity
- **NPI:** 1649465584 (Entity type: Individual)
- **Enumerated:** September 13, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** M7735 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 E SONTERRA BLVD, San Antonio, TX 78258-3971
- **Phone:** (855) 425-1055
## 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:** 9 organizations under Medicare reassignment (form CMS-855R): Ipc Healthcare Services Of Texas, PLLC (NPI 1023403011, San Antonio, TX); Memorial Hermann Medical Group (NPI 1003985102, Fulshear, TX); Tomagwa Ministries, Inc (NPI 1417543422, Tomball, TX); Seasons Medical Group Of Texas, PLLC (NPI 1275931545, Irving, TX); Seasons Medical Group Of Colorado, PC (NPI 1649707332, Westminster, CO); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** December 1, 2025
- **Other identifiers:** Other 74748 (MN); Other DR.0072034 (CO); Other 01091951A (IN); and 3 more
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Source: [NPI Profile](https://npiprofile.com/npi/1649465584) · Data from the CMS NPPES public registry.