Karen C. Diaz, MD
Obstetrics Physician · San Antonio, TX
Karen C. Diaz, MD is an obstetrics physician with a practice address in San Antonio, Texas, and NPI 1023125010, issued on Aug 24, 2006. Check the license (Texas G4981, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Karen C. Diaz
- Credential
- MD
- Primary taxonomy
- Obstetrics Physician 207VX0000X
- License number
- G4981 TX
Self-reported in NPPES; status is on the state search - Practice location
- 8300 Floyd Curl Dr FL 5, San Antonio, TX 78229
- Phone
- (210) 450-9500
- Enumerated
- Aug 24, 2006
- Record last updated
- Aug 23, 2024
- Fax
- (210) 450-6027
- Medicaid ID
- 117813901 TX
- Entity
- Type 1 · individual
8 nearest obstetrics physician records → All 103 in Texas → Look up another NPI →
Also registered at 8300 Floyd Curl Dr FL 5
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jessica Balstad, CNMAdvanced Practice Midwife1750077038
- Rachelle Bandino, PA-CPhysician Assistant1619621745
- Amy Bible, CNMAdvanced Practice Midwife1508976200
- Megan Brister, CNMAdvanced Practice Midwife1407207921
- Deborah Conway, MDMaternal & Fetal Medicine Physician1336256312
- Rachael Counts, MDObstetrics & Gynecology Physician1568081602
Verify Karen C. Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license G4981Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average obstetrics physician in 2024
93 Medicare Part D claims for 33 beneficiaries, against an average of 218 among the 863 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims.
Most prescribed
- Estradiol22 claims
- Oxybutynin Chloride Er16 claims
- Myrbetriq12 claims
- Tolterodine Tartrate Er12 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.
Karen C. Diaz among 103 obstetrics physician records in Texas
Karen C. Diaz, MD is one of 103 obstetrics physician records with a practice address in Texas. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 61% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 54% of these records are
- Record last updated2024 · 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 207VX0000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics Physician providers in Texas
There are 103 obstetrics physician records in Texas.
All 103 in Texas → Every provider in San Antonio → Obstetrics Physician nationwide →
The 8 obstetrics physician records with the nearest ZIP codes
- Alan Braid, MDSan Antonio, TX 782291205810447
- Jessica Guerrero, M.D.San Antonio, TX 782291457532830
- Roberta Krueger, M.D.San Antonio, TX 782291952410193
- Ashley Harris, M.D.San Antonio, TX 782321821418039
- Paul Dente Ellis, D.O.Fort Sam Houston, TX 782341992187256
- Jose Farina, M.D.San Antonio, TX 782121720012172
- Samantha Alvarado, MDSan Antonio, TX 782071932894862
- Jennifer Arzola, M.D.San Antonio, TX 782511285831594
Common questions
What is Karen C. Diaz, MD's NPI number?
Karen C. Diaz, MD's National Provider Identifier (NPI) is 1023125010, issued on Aug 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen C. Diaz, MD located?
The NPPES record lists a practice address at 8300 Floyd Curl Dr FL 5, San Antonio, TX, 78229. Phone: (210) 450-9500. Providers update this record themselves, so call before visiting.
How can I verify Karen C. Diaz, MD's license?
NPPES lists Texas license number G4981, 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 Karen C. Diaz, MD prescribe under Medicare Part D?
In 2024, Karen C. Diaz, MD had 93 Medicare Part D claims for 33 beneficiaries; the average among obstetrics physician prescribers was 218. 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.