Katherine Alison Sides, MD
Emergency Medicine Physician · San Marcos, TX
Katherine Alison Sides, MD is an emergency medicine physician with a practice address in San Marcos, Texas, and NPI 1003041484, issued on May 28, 2009. Check the license (Texas P1925, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Katherine Alison Sides
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- P1925 TX
157074 NC
Self-reported in NPPES; status is on the state search - Practice location
- 1301 Wonder World Dr, San Marcos, TX 78666
- Phone
- (512) 353-8979
- Enumerated
- May 28, 2009
- Record last updated
- Mar 5, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (512) 753-3698
- Medicare enrollment
- Enrolled (PECOS I20120820001084); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 2009
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 4,885 in Texas → Look up another NPI →
Also registered at 1301 Wonder World Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Raka Amin, MDInternal Medicine Physician1437576493
- Jose Ayala, MDInternal Medicine Physician1114960663
- Chad Benninghoff, NPFamily Nurse Practitioner1912256256
- Shyra BerishSpeech-Language Pathologist1235656364
- Jessica Best, MDEmergency Medicine Physician1679833354
Verify Katherine Alison Sides in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license P1925Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average emergency medicine physician in 2024
107 Medicare Part D claims for 55 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 19 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen17 claims
- Ondansetron Odt16 claims
- Cephalexin12 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.
Bills Medicare through one group practice
- Round Table Physicians Group PLLCHouston, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Alison Sides among 4,885 emergency medicine physician records in Texas
Katherine Alison Sides, MD 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 2009, is newer than 45% of them.
- NPI issued2009 · 45% of these records are older, 52% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2009 · median 2013 among the 2,779 with a school on file
- Record last updated2019 · 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).
11 emergency medicine physician records list a practice address in San Marcos
They are 11 of the 1,003 NPPES records with a practice address in San Marcos, and 4,885 emergency medicine physician records in Texas.
All 4,885 in Texas → Every provider in San Marcos → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Jessica Best, MDSan Marcos, TX 786661679833354
- Myla Canales, M.D.San Marcos, TX 786661376886317
- Curtis Grote, MDSan Marcos, TX 786661720078090
- Bradley LawingSan Marcos, TX 786661629411517
- Toan Leung, MDSan Marcos, TX 786661699726000
- Daniel Loisel, DOSan Marcos, TX 786661245220540
- Jose Pena, MDSan Marcos, TX 786661104817220
- Randolph Seybold, MDSan Marcos, TX 786661659361954
Common questions
What is Katherine Alison Sides, MD's NPI number?
Katherine Alison Sides, MD's National Provider Identifier (NPI) is 1003041484, issued on May 28, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Alison Sides, MD located?
The NPPES record lists a practice address at 1301 Wonder World Dr, San Marcos, TX, 78666. Phone: (512) 353-8979. Providers update this record themselves, so call before visiting.
How can I verify Katherine Alison Sides, MD's license?
NPPES lists Texas license number P1925, 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 Katherine Alison Sides, MD prescribe under Medicare Part D?
In 2024, Katherine Alison Sides, MD had 107 Medicare Part D claims for 55 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.