William James Grenier, APRN, NPC
- Medicare patients, 2024
- 18
- Part D claims, 2024
- 888
- Hospital affiliations
- 2
- Industry payments
- $149
- Medical group
- 1
- Practice address
- 45 Lower Westfield Road, Holyoke, MA 01040
- Practice phone
- Call (413) 315-4100
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find William Grenier's professional email, personal email and mobile number
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William James Grenier is a family nurse practitioner in Holyoke, Massachusetts
William Grenier practices at Valley Springs Behavioral Health Hospital in Holyoke, Massachusetts, part of Valley Springs Behavioral Health Hospital.
William Grenier's NPI, 1154626521, was assigned on January 17, 2011. William Grenier holds Kentucky license 3006776.
- NPI
- 1154626521NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1557547460
- NPI enumeration date
- January 17, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (413) 315-4100
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
William James Grenier practices at Valley Springs Behavioral Health Hospital in Holyoke, Massachusetts
William Grenier's primary practice is Valley Springs Behavioral Health Hospital, at 45 Lower Westfield Road, Holyoke, MA 01040 in Hampden County. The practice phone is (413) 315-4100.
- Valley Springs Behavioral Health Hospital45 Lower Westfield Road, Holyoke, MA 01040 · Hampden CountyPhone(413) 315-4100
Source: Dmand AI Affiliation Data
William James Grenier is affiliated with 2 sites of care and 1 medical group
William Grenier's primary practice is Valley Springs Behavioral Health Hospital in Holyoke, Massachusetts, part of Valley Springs Behavioral Health Hospital. William Grenier is also affiliated with Baystate Medical Center. The medical group on file is Impact Physician Group Massachusetts.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at William James Grenier's practice
Dmand AI tracks the electronic health record (EHR) system at each site where William Grenier practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Valley Springs Behavioral Health Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Valley Springs Behavioral Health Hospital and 6.2K+ hospitals, with verified contacts in the same login.
William James Grenier is one of 3,644 family nurse practitioners in Massachusetts
Family is William Grenier's primary specialty in the NPI Registry, under taxonomy code 363LF0000X. Dmand AI has William Grenier's licenses on file in 5 states: Kentucky, Florida, Indiana, North Carolina and Ohio.
Specialties and state licenses
- Family nurse practitioner, KentuckyPrimary
- Florida license
- Indiana license
- North Carolina license
- Ohio license
Family nurse practitioners near William Grenier
Counts of family nurse practitioners with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
William James Grenier treated 18 Medicare patients in 2024, average age 53
CMS counts 18 Medicare patients who saw William Grenier in 2024. Their average risk score is 0.63, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts William Grenier's median patient age at 56, with 56% women.
William Grenier's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 56
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
William James Grenier wrote 888 Medicare Part D claims in 2024
In 2024, William Grenier wrote 888 Medicare Part D claims for 46 patients. 82% of them were for generic drugs.
William Grenier's Part D claims by kind of drug, 2024
- Generic732 claims82%
- Brand-name and other156 claims18%
Drug classes CMS tracks in William Grenier's Part D claims, 2024
- Antibiotics2%15 of 888 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How William James Grenier takes part in Medicare
William Grenier accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
William James Grenier received $149 in industry payments in 2025
CMS Open Payments shows 2 general payments to William Grenier from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Alkermes, Inc. paid the most, $149.
Companies that paid William Grenier the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for William James Grenier's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about William James Grenier
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is William James Grenier's NPI number?
William James Grenier's NPI number is 1154626521. It was assigned on January 17, 2011, and it is active in the NPI Registry.
What does William James Grenier specialize in?
William James Grenier is a family nurse practitioner in Holyoke, Massachusetts. The primary specialty in the NPI Registry is Family Nurse Practitioner (taxonomy code 363LF0000X).
Where does William James Grenier practice?
William Grenier practices at 45 Lower Westfield Road, Holyoke, MA 01040. William Grenier's primary practice is Valley Springs Behavioral Health Hospital in Holyoke, Massachusetts, part of Valley Springs Behavioral Health Hospital.
What is William James Grenier's office phone number?
The practice phone on file for William Grenier is (413) 315-4100.
What is William James Grenier's medical license number?
William Grenier holds Kentucky license 3006776, one of the licenses on file in 5 states.
Which states has William James Grenier been licensed in?
Dmand AI has state licenses on file for William Grenier in Kentucky, Florida, Indiana, North Carolina and Ohio.
Which hospitals is William James Grenier affiliated with?
William Grenier practices at Valley Springs Behavioral Health Hospital in Holyoke, Massachusetts. William Grenier is also affiliated with Baystate Medical Center.
What medical group is William James Grenier part of?
William Grenier is linked to Impact Physician Group Massachusetts.
Does William James Grenier accept Medicare?
Yes. CMS lists William Grenier as accepting Medicare assignment.
How many Medicare patients does William James Grenier see?
CMS counts 18 Medicare patients who saw William Grenier in 2024, with an average age of 53.
Has William James Grenier received payments from drug or device companies?
CMS Open Payments shows $149 in general payments to William Grenier from 1 company from 2025 to 2025. The largest total came from Alkermes, Inc.
How long has William James Grenier been practicing?
William Grenier graduated from medical school in 2008, 18 years ago.
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