Ellen Grimm, MD
NPI 1275500100 · Nephrology Physician · San Marcos, TX
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ellen Grimm, MD is a Nephrology Physician provider in San Marcos, TX (NPI 1275500100).
Provider details
- NPI number
- 1275500100
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- J4170 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
890 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 205 | $339 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 154 | $122 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 142 | $77 |
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 114 | $282 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 75 | $115 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 156 | 54 |
| Furosemide | 137 | 43 |
| Losartan Potassium | 110 | 34 |
| Sevelamer Carbonate | 107 | 29 |
| Allopurinol | 81 | 20 |
| Pantoprazole Sodium | 81 | 24 |
| Hydralazine Hcl | 78 | 24 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$282 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-28
- Last updated
- 2022-02-01
Frequently asked questions
- What is Ellen Grimm's NPI number?
- Ellen Grimm's National Provider Identifier (NPI) is 1275500100, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ellen Grimm's specialty?
- Ellen Grimm is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Ellen Grimm located?
- Ellen Grimm's practice location on file with NPPES is 1330 Wonder World Dr, San Marcos, TX 78666-7566.
- What is Ellen Grimm's phone number?
- The practice phone number listed in the NPPES registry for Ellen Grimm is (512) 805-0680.
- Does Ellen Grimm accept Medicare?
- Ellen Grimm is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ellen Grimm's NPI active?
- Yes — Ellen Grimm's NPI (1275500100) is active in the NPPES registry as of the last update on 2022-02-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.