Dr. William J. Kassler, MD
- Part D claims, 2024
- 228
- Hospital affiliations
- 2
- Industry payments
- $23
- Medical group
- 1
- State license
- 1
- Practice address
- 1 Elliot Way, Manchester, NH 03103
- Practice phone
- Call (603) 669-5300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Kassler's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William J. Kassler is an internist in Manchester, New Hampshire
Dr. Kassler practices at Elliot Hospital in Manchester, New Hampshire, part of SolutionHealth.
Dr. Kassler's NPI, 1538162672, was assigned on May 23, 2005. Dr. Kassler graduated from University of Massachusetts Medical School in 1984. Dr. Kassler holds New Hampshire license 10716.
- NPI
- 1538162672NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5092036723
- NPI enumeration date
- May 23, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (603) 669-5300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 68
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William J. Kassler practices at Elliot Hospital in Manchester, New Hampshire
Dr. Kassler's primary practice is Elliot Hospital, at 1 Elliot Way, Manchester, NH 03103 in Hillsborough County. The practice phone is (603) 669-5300.
- Elliot Hospital1 Elliot Way, Manchester, NH 03103 · Hillsborough CountyPhone(603) 669-5300
Source: Dmand AI Affiliation Data
Dr. William J. Kassler is affiliated with 3 sites of care and 1 medical group
Dr. Kassler's primary practice is Elliot Hospital in Manchester, New Hampshire, part of SolutionHealth. The medical group on file is Amoskeag Health. Dmand AI also links Dr. Kassler to 1 more hospital and 1 community health center, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William J. Kassler's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kassler practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Elliot Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across SolutionHealth and 6.2K+ hospitals, with verified contacts in the same login.
Dr. William J. Kassler is one of 577 internists in New Hampshire
Internal medicine is Dr. Kassler's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Kassler is licensed in New Hampshire.
Specialties and state licenses
- Internal medicine, New HampshirePrimary
Internists near Dr. Kassler
Counts of internists 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
Dr. William J. Kassler's patients have a median age of 51
Across all payers, Dmand AI patient panel data puts Dr. Kassler's median patient age at 51, with 48% women.
Dr. Kassler's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women48%
- Men52%
Source: Dmand AI Patient Panel Data
Dr. William J. Kassler wrote 228 Medicare Part D claims in 2024
In 2024, Dr. Kassler wrote 228 Medicare Part D claims for 46 patients. 77% of them were for generic drugs. CMS names the drug for 32 of them, across 2 drugs with 11 or more claims each, at $114 in total drug cost.
Dr. Kassler's Part D claims by kind of drug, 2024
- Generic175 claims77%
- Brand-name and other53 claims23%
Dr. Kassler's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. William J. Kassler takes part in Medicare
Dr. Kassler 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)
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Dr. William J. Kassler received $23 in industry payments in 2020
CMS Open Payments shows 1 general payment to Dr. Kassler from 1 drug or device company in 2020. Food and beverage make up the largest share, 100% of the total. Merck Sharp & Dohme Corporation paid the most, $23.
Companies that paid Dr. Kassler the most, 2020 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William J. Kassler graduated from University of Massachusetts Medical School
Dr. Kassler graduated from University of Massachusetts Medical School in 1984.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William J. Kassler'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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)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) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 Dr. William J. Kassler
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William J. Kassler's NPI number?
Dr. William J. Kassler's NPI number is 1538162672. It was assigned on May 23, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. William J. Kassler?
Dr. William J. Kassler is an internist in Manchester, New Hampshire. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William J. Kassler practice?
Dr. Kassler practices at 1 Elliot Way, Manchester, NH 03103. Dr. Kassler's primary practice is Elliot Hospital in Manchester, New Hampshire, part of SolutionHealth. Dmand AI also links Dr. Kassler to 1 hospital and 1 community health center.
What is Dr. William J. Kassler's office phone number?
The practice phone on file for Dr. Kassler is (603) 669-5300.
What is Dr. William J. Kassler's medical license number?
Dr. Kassler holds New Hampshire license 10716.
Which hospitals is Dr. William J. Kassler affiliated with?
Dr. Kassler practices at Elliot Hospital in Manchester, New Hampshire. Dmand AI links Dr. Kassler to 1 more hospital.
What medical group is Dr. William J. Kassler part of?
Dr. Kassler is linked to Amoskeag Health.
Does Dr. William J. Kassler accept Medicare?
Yes. CMS lists Dr. Kassler as accepting Medicare assignment.
Where did Dr. William J. Kassler go to medical school?
Dr. Kassler graduated from University of Massachusetts Medical School in 1984.
What drugs does Dr. William J. Kassler prescribe most?
In 2024 Medicare Part D data, Dr. Kassler's most prescribed drugs by claims were Metformin HCl and Amlodipine Besylate.
Has Dr. William J. Kassler received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Dr. Kassler from 1 company from 2020 to 2020. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. William J. Kassler been practicing?
Dr. Kassler graduated from medical school in 1984, 42 years ago.
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