Dr. William W. Kessler, MD
- Medicare services, 2024
- 78
- Medicare patients, 2024
- 38
- Part D claims, 2024
- 67
- Hospital affiliations
- 1
- Industry payments
- $2,309
- Practice address
- 225 Williamson St, Elizabeth, NJ 07202
- Practice phone
- Call (908) 994-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Trinitas Regional Medical Center - Williamson Street Campus
Elizabeth, New Jersey
Find Dr. Kessler's professional email, personal email and mobile number
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Dr. William W. Kessler is a medical oncologist in Elizabeth, New Jersey
Dr. Kessler practices at Trinitas Regional Medical Center - Williamson Street Campus in Elizabeth, New Jersey.
Dr. Kessler's NPI, 1083710842, was assigned on September 16, 2006. Dr. Kessler graduated from Albert Einstein College of Medicine of Yeshiva University in 1975. Dr. Kessler holds New Jersey license MA033567.
- NPI
- 1083710842NPI Registry (opens in a new tab)
- NPI enumeration date
- September 16, 2006
- NPI status
- Active
- Practice phone
- (908) 994-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 77
- Medical school graduation
- 1975
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. William W. Kessler practices at Trinitas Regional Medical Center - Williamson Street Campus in Elizabeth, New Jersey
Dr. Kessler's primary practice is Trinitas Regional Medical Center - Williamson Street Campus, at 225 Williamson St, Elizabeth, NJ 07202 in Union County. The practice phone is (908) 994-5000.
- Trinitas Regional Medical Center - Williamson Street Campus225 Williamson St, Elizabeth, NJ 07202 · Union CountyPhone(908) 994-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. William W. Kessler is affiliated with 2 sites of care and 1 medical group
Dr. Kessler's primary practice is Trinitas Regional Medical Center - Williamson Street Campus in Elizabeth, New Jersey. Dr. Kessler is also affiliated with Trinitas Regional Medical Center. The medical group on file is RWJBarnabas Health Medical Group.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William W. Kessler's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Kessler practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Trinitas Regional Medical Center - Williamson Street Campus | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William W. Kessler is one of 115 medical oncologists in New Jersey
Medical oncology is Dr. Kessler's primary specialty in the NPI Registry, under taxonomy code 207RX0202X. Dr. Kessler is licensed in New Jersey.
Specialties and state licenses
- Medical oncology, New JerseyPrimary
Medical oncologists near Dr. Kessler
Counts of medical oncologists 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 W. Kessler billed Medicare for 78 services in 2024
CMS data shows 78 Medicare services from Dr. Kessler across 3 procedure codes in 2024, for 38 Medicare patients. Medicare paid $4,796 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Kessler's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 832024: 786%
Dr. Kessler compared with the New Jersey median for medical oncologists, 2024
- Dr. Kessler
- New Jersey median
- Medicare services
- 78vs 72389% below
- Medicare patients
- 38vs 23284% below
- Part D claims
- 12vs 35997% below
Medians across 107 medical oncologists in New Jersey with Dmand AI profiles that report each measure.
Dr. Kessler's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William W. Kessler treated 38 Medicare patients in 2024, average age 74
CMS counts 38 Medicare patients who saw Dr. Kessler in 2024. The largest group is 65 to 74, with 12 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 34% are also on Medicaid. Their average risk score is 3.04, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Kessler's median patient age at 63, with 60% women.
Dr. Kessler's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Kessler's Medicare patients by sex, 2024
- Women2361%
- Men1539%
Chronic conditions among Dr. Kessler's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes63%
- COPD53%
- Chronic kidney disease50%
- Heart failure50%
- Ischemic heart disease47%
- Cancer45%
Share of Medicare patients with each condition. A patient can have several.
Dr. Kessler's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women60%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William W. Kessler wrote 67 Medicare Part D claims in 2024
In 2024, Dr. Kessler wrote 67 Medicare Part D claims for 13 patients. 73% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $7,177 in total drug cost. In 2022, CMS named 146 claims across 8 drugs.
Dr. Kessler's Part D claims by kind of drug, 2024
- Generic49 claims73%
- Brand-name18 claims27%
Dr. Kessler'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.
Part D claims for drugs CMS names, 2022 to 2024
- 2022
- 2024
- Claims for drugs CMS names
- 2022: 1462024: 1292%
Drugs named by CMS: 1 in 2024, 8 in 2022.
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
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Dr. William W. Kessler received $2,309 in industry payments from 2016 to 2025
CMS Open Payments shows 129 general payments to Dr. Kessler from 34 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $306.
General payments to Dr. Kessler by program year, 2016 to 2025
Companies that paid Dr. Kessler the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William W. Kessler graduated from Albert Einstein College of Medicine of Yeshiva University
Dr. Kessler graduated from Albert Einstein College of Medicine of Yeshiva University in 1975.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William W. Kessler'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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 and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (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 W. Kessler
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 W. Kessler's NPI number?
Dr. William W. Kessler's NPI number is 1083710842. It was assigned on September 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William W. Kessler?
Dr. William W. Kessler is a medical oncologist in Elizabeth, New Jersey. The primary specialty in the NPI Registry is Medical Oncology Physician (taxonomy code 207RX0202X).
Where does Dr. William W. Kessler practice?
Dr. Kessler practices at 225 Williamson St, Elizabeth, NJ 07202. Dr. Kessler's primary practice is Trinitas Regional Medical Center - Williamson Street Campus in Elizabeth, New Jersey.
What is Dr. William W. Kessler's office phone number?
The practice phone on file for Dr. Kessler is (908) 994-5000.
What is Dr. William W. Kessler's medical license number?
Dr. Kessler holds New Jersey license MA033567.
Which hospitals is Dr. William W. Kessler affiliated with?
Dr. Kessler is affiliated with Trinitas Regional Medical Center.
What medical group is Dr. William W. Kessler part of?
Dr. Kessler is linked to RWJBarnabas Health Medical Group.
Does Dr. William W. Kessler accept Medicare?
Yes. CMS data shows Dr. Kessler billed Medicare for 78 services in 2024.
How many Medicare patients does Dr. William W. Kessler see?
CMS counts 38 Medicare patients who saw Dr. Kessler in 2024, with an average age of 74.
What services does Dr. William W. Kessler bill to Medicare?
In 2024, Dr. Kessler's most billed Medicare services were hospital inpatient care (99231), hospital inpatient care (99232) and hospital inpatient care (99223).
Show 4 more questionsShow fewer questions
Where did Dr. William W. Kessler go to medical school?
Dr. Kessler graduated from Albert Einstein College of Medicine of Yeshiva University in 1975.
What drugs does Dr. William W. Kessler prescribe most?
In 2024 Medicare Part D data, Dr. Kessler's most prescribed drugs by claims were Eliquis.
Has Dr. William W. Kessler received payments from drug or device companies?
CMS Open Payments shows $2,309 in general payments to Dr. Kessler from 34 companies from 2016 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. William W. Kessler been practicing?
Dr. Kessler graduated from medical school in 1975, 51 years ago.
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