Rachel Littlefield, M.D.
Emergency Medicine Physician · San Antonio, TX
Rachel Littlefield, M.D. is an emergency medicine physician with a practice address in San Antonio, Texas, and NPI 1508228503, issued on Mar 28, 2016. Check the license (Texas S0937, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Rachel Littlefield
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- S0937 TX
E-11839 AR
Self-reported in NPPES; status is on the state search - Practice location
- 3333 Research Plz, San Antonio, TX 78235
- Phone
- (512) 954-0724
- Enumerated
- Mar 28, 2016
- Record last updated
- May 7, 2020 (not updated in 6 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 4,885 in Texas → Look up another NPI →
Also registered at 3333 Research Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dominic Ancona, PAPhysician Assistant1548871387
- Ruby Apigo-Garcia, NPAcute Care Nurse Practitioner1447103684
- Belinda Benavidez, AGACNPAcute Care Nurse Practitioner1346899879
- Gilbert Cervantes, FNP-CPrimary Care Nurse Practitioner1053956623
- Michael Chukwu, DOInternal Medicine Physician1952042665
- Rommel Del Rosario, M.D.Internal Medicine Physician1467778118
Verify Rachel Littlefield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license S0937Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% fewer Medicare Part D claims than the average emergency medicine physician in 2024
207 Medicare Part D claims for 134 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 19 claims were for opioids.
Most prescribed
- Ondansetron Odt25 claims
- Dicyclomine Hcl19 claims
- Cefdinir16 claims
- Hydrocodone-Acetaminophen16 claims
- Naproxen14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Rachel Littlefield among 4,885 emergency medicine physician records in Texas
Rachel Littlefield, M.D. is one of 4,885 emergency medicine physician records with a practice address in Texas. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 70% of them.
- NPI issued2016 · 70% of these records are older, 26% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2020 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
400 emergency medicine physician records list a practice address in San Antonio
They are 400 of the 37,749 NPPES records with a practice address in San Antonio, and 4,885 emergency medicine physician records in Texas.
All 4,885 in Texas → Every provider in San Antonio → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Patrick Malie, DOSan Antonio, TX 782351912387473
- Thomas Caldwell, MDJbsa Fort Sam Houston, TX 782341124768718
- Hanna Carr, MDSan Antonio, TX 782341407555923
- William Collins, MDSan Antonio, TX 782341538867023
- Joseph Cornett, MDJbsa Lackland, TX 782361841435963
- Peter Cuenca, M.D.Jbsa Lackland, TX 782361194714113
- George Dockendorf, DOLackland A F B, TX 782361265477343
- James Eadie, MDLackland A F B, TX 782361376573063
Common questions
What is Rachel Littlefield, M.D.'s NPI number?
Rachel Littlefield, M.D.'s National Provider Identifier (NPI) is 1508228503, issued on Mar 28, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Rachel Littlefield, M.D. located?
The NPPES record lists a practice address at 3333 Research Plz, San Antonio, TX, 78235. Phone: (512) 954-0724. Providers update this record themselves, so call before visiting.
How can I verify Rachel Littlefield, M.D.'s license?
NPPES lists Texas license number S0937, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Rachel Littlefield, M.D. prescribe under Medicare Part D?
In 2024, Rachel Littlefield, M.D. had 207 Medicare Part D claims for 134 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.