Quick answers
- Does Ilsa Y. Grunder accept Medicare assignment?
- Yes. Medicare's clinician data says Ilsa Y. Grunder accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Ilsa Y. Grunder see?
- In 2024, CMS data shows 431 Original Medicare patients and 100,419 services for Ilsa Y. Grunder. This counts Original Medicare only and measures volume, not quality.
- What is Ilsa Y. Grunder's NPI number?
- 1073653507. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Ilsa Y. Grunder, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 431 |
|---|---|
| Services billed to Medicare | 100,419 |
| Different services or procedures | 119 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Injection, iron sucrose, 1 mg (J1756)16,000 services
- Injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use) (Q0138)15,810 services
- Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mg (J1568)2,430 services
- Injection, abatacept, 10 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered) (J0129)2,250 services
- Injection, infliximab, excludes biosimilar, 10 mg (J1745)1,940 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure71%
- Arthritis47%
- Chronic kidney disease37%
- Ischemic heart disease34%
- Anxiety33%
Practice locations
Addresses where Ilsa Y. Grunder is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Eaton PlWorcester, MA 01608 (508) 556‑5400
Group practices
Medicare enrollment lists Ilsa Y. Grunder as a member of this group (CMS data updated October 2, 2026).
- Reliant Medical Group Inc640 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Worcester
Clinicians with the same Medicare primary specialty in Worcester, MA — not a recommendation.
Other clinicians in Reliant Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2005 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1073653507 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians