Ellen M. Grimm, MD
Nephrology Physician · San Marcos, TX
Ellen M. Grimm, MD is a nephrology physician with a practice address in San Marcos, Texas, and NPI 1275500100, issued on Feb 28, 2006. Check the license (Texas J4170, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Ellen M. Grimm
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- J4170 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1330 Wonder World Dr, San Marcos, TX 78666
- Phone
- (512) 805-0680
- Enumerated
- Feb 28, 2006
- Record last updated
- Feb 1, 2022
- Fax
- (512) 805-0682
- Medicaid IDs
- 101802002 TX
101802004 TX - Medicare enrollment
- Enrolled (PECOS I20090130000095); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At Houston, 1992
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,159 in Texas → Look up another NPI →
Also registered at 1330 Wonder World Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Billie Martin, PAMedical Physician Assistant1457344780
- Curtis Solomon, MDInterventional Cardiology Physician1801016480
Verify Ellen M. Grimm in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license J4170Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% more Medicare Part D claims than the average nephrology physician in 2024
2,452 Medicare Part D claims for 215 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Amlodipine Besylate156 claims
- Furosemide137 claims
- Losartan Potassium110 claims
- Sevelamer Carbonate107 claims
- Allopurinol81 claims
- Pantoprazole Sodium81 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.
The MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $281.81
7 payments; by number, the most common kind was food and beverage; the largest payer was Fresenius USA Marketing, Inc. The 8,230 providers of this specialty with any payment received $3,091.37 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
- The Austin Diagnostic Clinic PLLCAustin, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ellen M. Grimm among 1,159 nephrology physician records in Texas
Ellen M. Grimm, MD is one of 1,159 nephrology physician records with a practice address in Texas. 89% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 53% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 82% of these records are
- Graduated1992 · median 2001 among the 954 with a school on file
- Record last updated2022 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Texas
There are 1,159 nephrology physician records in Texas.
All 1,159 in Texas → Every provider in San Marcos → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Qing Ren, M.D.San Marcos, TX 786661316137722
- Roshny George, MDRound Rock, TX 786651134180268
- Maaz Syed Ahmed, M.D.,Round Rock, TX 786651790947927
- Alexander Goldstein, M.D.Marble Falls, TX 786541407201239
- Ravi Mididoddi, M.DRound Rock, TX 786811235176710
- Pratima Kamada, M.D.Lockhart, TX 786441801113790
- Hwarang Han, DOAustin, TX 787011740667534
- Elena Slavcheva, MDAustin, TX 787021639130313
Common questions
What is Ellen M. Grimm, MD's NPI number?
Ellen M. Grimm, MD's National Provider Identifier (NPI) is 1275500100, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ellen M. Grimm, MD located?
The NPPES record lists a practice address at 1330 Wonder World Dr, San Marcos, TX, 78666. Phone: (512) 805-0680. Providers update this record themselves, so call before visiting.
How can I verify Ellen M. Grimm, MD's license?
NPPES lists Texas license number J4170, 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 Ellen M. Grimm, MD prescribe under Medicare Part D?
In 2024, Ellen M. Grimm, MD had 2,452 Medicare Part D claims for 215 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
What is Ellen M. Grimm, MD's MIPS final score?
The 2023 MIPS final score is 100 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.