RACHEL LITTLEFIELD M.D.
NPI 1508228503
Emergency Medicine in San Antonio, TX
About Rachel Littlefield M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RACHEL LITTLEFIELD M.D. (NPI 1508228503) is an individual emergency medicine provider in San Antonio, Texas, licensed in Texas (S0937) and active in the NPI registry since March 2016. She is enrolled in Medicare PECOS, is affiliated with Baptist Medical Center, and maintains a secondary practice location in Little Rock.
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
Rachel Littlefield 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
5Medicare enrollment records show Rachel Littlefield reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Antonio, TX 78249
- Reassigned Medicare billing, Texas enrollment
- 379 clinicians in this Medicare group
Austin, TX 78705
- Reassigned Medicare billing, Texas enrollment
- 547 clinicians in this Medicare group
Austin, TX 78705
- Reassigned Medicare billing, Texas enrollment
- 1,511 clinicians in this Medicare group
The Woodlands, TX 77380
- Reassigned Medicare billing, Texas enrollment
- 56 clinicians in this Medicare group
Gainesville, TX 76240
- Reassigned Medicare billing, Texas enrollment
- 1,193 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 4
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Baptist Medical Center
Acute Care Hospitals · San Antonio, TXBaptist Neighborhood Hospital Thousand Oaks
Acute Care Hospitals · San Antonio, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 78235 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.
SAN ANTONIO, TX 78235
SAN ANTONIO, TX 78235
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 Rachel Littlefield's NPI number?
The NPI number for Rachel Littlefield is 1508228503. It was assigned to this individual provider in the NPPES registry on March 28, 2016.
Where is Rachel Littlefield located?
Rachel Littlefield practices at 3333 Research Plz, San Antonio, TX 78235. The listed phone number is (512) 954-0724.
What is Rachel Littlefield's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Rachel Littlefield enrolled in Medicare?
Yes. Rachel Littlefield 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 Rachel Littlefield's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Rachel Littlefield reassigns Medicare benefits to 5 organizations: Third Coast Emergency Physicians Southwest PA (San Antonio, TX), Longhorn Emergency Medical Associates PA (Austin, TX), Travis County Emergency Physicians PA (Austin, TX), Pediatric Urgent Care PA (The Woodlands, TX) and Acs Primary Care Physicians Southwest, PA (Gainesville, 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 Rachel Littlefield's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Rachel Littlefield accept?
Health plans from Baylor Scott and White Health Plan, Blue Cross and Blue Shield of Texas, Imperial Insurance Companies, Inc., Oscar Insurance Company and Sendero Health Plans, Local Nonprofit and 1 other insurer list Rachel Littlefield 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 Rachel Littlefield affiliated with any hospitals?
According to CMS data, Rachel Littlefield is affiliated with Baptist Medical Center and Baptist Neighborhood Hospital Thousand Oaks.
When was this NPI record last updated?
The NPPES record for Rachel Littlefield was last updated on May 7, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Rachel Littlefield, M.D. · NPI 1508228503
Emergency Medicine physician in San Antonio, Texas. Individual provider, active in the CMS NPPES registry since March 28, 2016.
## Identity
- **NPI:** 1508228503 (Entity type: Individual)
- **Enumerated:** March 28, 2016
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** S0937 (Texas)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3333 RESEARCH PLZ, San Antonio, TX 78235-5154
- **Phone:** (512) 954-0724
## 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): Third Coast Emergency Physicians Southwest PA (NPI 1497793475, San Antonio, TX); Longhorn Emergency Medical Associates PA (NPI 1649669672, Austin, TX); Travis County Emergency Physicians PA (NPI 1962440933, Austin, TX); Pediatric Urgent Care PA (NPI 1598059776, The Woodlands, TX); Acs Primary Care Physicians Southwest, PA (NPI 1538101019, Gainesville, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Texas A & M University System, Hsc, College Of Medicine, class of 2016
## Record status
- **NPPES last updated:** May 7, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1508228503) · Data from the CMS NPPES public registry.