Karen Evelin Olarte Merida, M.D.
Internal Medicine Physician · San Antonio, TX
Karen Evelin Olarte Merida, M.D. is an internal medicine physician with a practice address in San Antonio, Texas, and NPI 1245460260, issued on Jul 24, 2009. Check the license (Texas P5442, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Karen Evelin Olarte Merida
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- P5442 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1313 Guadalupe St Ste 100, San Antonio, TX 78207
- Phone
- (210) 921-3800
- Enumerated
- Jul 24, 2009
- Record last updated
- Jul 19, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20130920000210); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Verify Karen Evelin Olarte Merida in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license P5442Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.0 times the Medicare Part D claims of the average internal medicine physician in 2024
12,720 Medicare Part D claims for 739 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 412 claims were for opioids.
Most prescribed
- Atorvastatin Calcium973 claims
- Levocetirizine Dihydrochloride421 claims
- Losartan Potassium402 claims
- Lisinopril384 claims
- Amlodipine Besylate371 claims
- Gabapentin364 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.
Industry payments in 2024: $1,126.18
57 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Gmg Health Systems Associates PASan Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Evelin Olarte Merida among 9,175 internal medicine physician records in Texas
Karen Evelin Olarte Merida, M.D. is one of 9,175 internal medicine physician records with a practice address in Texas. 82% 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 54% of them.
- NPI issued2009 · 54% of these records are older, 42% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2006 · median 2004 among the 6,088 with a school on file
- Record last updated2021 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
657 internal medicine physician records list a practice address in San Antonio
They are 657 of the 37,749 NPPES records with a practice address in San Antonio, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in San Antonio → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Delia Bullock, M.D.San Antonio, TX 782071598748097
- Annie Chacko, MDSan Antonio, TX 782071598878787
- Jorge Estrada, M.D.San Antonio, TX 782071346274495
- Ernesto Garza, M.D.San Antonio, TX 782071376685115
- Sarah Lapey, MDSan Antonio, TX 782071619084787
- David Montemayor, M.D.San Antonio, TX 782071255343042
- Nasser Nakissa, MDSan Antonio, TX 782071689774010
- Ambili Ramachandran, M.D.San Antonio, TX 782071467696047
Common questions
What is Karen Evelin Olarte Merida, M.D.'s NPI number?
Karen Evelin Olarte Merida, M.D.'s National Provider Identifier (NPI) is 1245460260, issued on Jul 24, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Karen Evelin Olarte Merida, M.D. located?
The NPPES record lists a practice address at 1313 Guadalupe St Ste 100, San Antonio, TX, 78207. Phone: (210) 921-3800. Providers update this record themselves, so call before visiting.
How can I verify Karen Evelin Olarte Merida, M.D.'s license?
NPPES lists Texas license number P5442, 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 Evelin Olarte Merida, M.D. prescribe under Medicare Part D?
In 2024, Karen Evelin Olarte Merida, M.D. had 12,720 Medicare Part D claims for 739 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.