Ilsa Y. Grunder, NP
Nurse Practitioner · Worcester, MA
Ilsa Y. Grunder, NP is a nurse practitioner with a practice address in Worcester, Massachusetts, and NPI 1073653507, issued on Feb 7, 2007. Check the license (Massachusetts 196255, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Ilsa Y. Grunder
- Credential
- NP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 196255 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Lake Ave N, Worcester, MA 01655
- Phone
- (508) 856-3509
- Enumerated
- Feb 7, 2007
- Record last updated
- Jun 11, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070413000118); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 3,480 in Massachusetts → Look up another NPI →
Also registered at 55 Lake Ave N
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ilsa Y. Grunder in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 196255Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% fewer Medicare Part D claims than the average nurse practitioner in 2024
344 Medicare Part D claims for 129 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of claims.
Most prescribed
- Eliquis62 claims
- Hydroxyurea40 claims
- Prednisone21 claims
- Letrozole18 claims
- Levothyroxine Sodium17 claims
- Sprycel12 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: $125.62
3 payments; by number, the most common kind was food and beverage; the largest payer was Myriad Genetic Laboratories, Inc. The 38,884 providers of this specialty with any payment received $791.64 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
- Reliant Medical Group IncWorcester, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ilsa Y. Grunder among 3,480 nurse practitioner records in Massachusetts
Ilsa Y. Grunder, NP is one of 3,480 nurse practitioner records with a practice address in Massachusetts. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 22% of them.
- NPI issued2007 · 22% of these records are older, 69% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated2005 · median 2017 among the 1,963 with a school on file
- Record last updated2021 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
499 nurse practitioner records list a practice address in Worcester
They are 499 of the 13,166 NPPES records with a practice address in Worcester, and 3,480 nurse practitioner records in Massachusetts.
All 3,480 in Massachusetts → Every provider in Worcester → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Patricia Amelin, CNPWorcester, MA 016551174597447
- Deborah Benes, N.P.Worcester, MA 016551548258890
- Janice Beschle, NPWorcester, MA 016551376517995
- Carol Bova, NPWorcester, MA 016551679547285
- Dawn Carpenter, NPWorcester, MA 016551366416968
- Dianne Carter, NPWorcester, MA 016551083688394
- Ann Connolly, NPWorcester, MA 016551841264157
- Maria Cote, CNPWorcester, MA 016551689648982
Common questions
What is Ilsa Y. Grunder, NP's NPI number?
Ilsa Y. Grunder, NP's National Provider Identifier (NPI) is 1073653507, issued on Feb 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ilsa Y. Grunder, NP located?
The NPPES record lists a practice address at 55 Lake Ave N, Worcester, MA, 01655. Phone: (508) 856-3509. Providers update this record themselves, so call before visiting.
How can I verify Ilsa Y. Grunder, NP's license?
NPPES lists Massachusetts license number 196255, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Ilsa Y. Grunder, NP prescribe under Medicare Part D?
In 2024, Ilsa Y. Grunder, NP had 344 Medicare Part D claims for 129 beneficiaries; the average among nurse practitioner prescribers was 1,109. 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.