Dr. William Neal Duffy, MD
- Medicare services, 2024
- 1,195
- Medicare patients, 2024
- 234
- Part D claims, 2024
- 3,299
- Hospital affiliations
- 2
- Medical group
- 1
- Practice address
- 1800 Lombard Street, Philadelphia, PA 19146
- Practice phone
- Call (215) 893-2548
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
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Dr. William Neal Duffy is an internist in Philadelphia, Pennsylvania
Dr. Duffy practices at Penn Medicine | Good Shepherd Rehabilitation Specialty Hospital in Philadelphia, Pennsylvania, part of University of Pennsylvania.
Dr. Duffy's NPI, 1538108055, was assigned on June 6, 2006. Dr. Duffy graduated from Georgetown University School of Medicine in 1993. Dr. Duffy holds Pennsylvania license MD060436L.
- NPI
- 1538108055NPI Registry (opens in a new tab)
- NPI enumeration date
- June 6, 2006
- NPI status
- Active
- Practice phone
- (215) 893-2548
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. William Neal Duffy practices at Penn Medicine | Good Shepherd Rehabilitation Specialty Hospital in Philadelphia, Pennsylvania
Dr. Duffy's primary practice is Penn Medicine | Good Shepherd Rehabilitation Specialty Hospital, at 1800 Lombard Street, Philadelphia, PA 19146 in Philadelphia County. The practice phone is (215) 893-2548.
- Penn Medicine | Good Shepherd Rehabilitation Specialty Hospital1800 Lombard Street, Philadelphia, PA 19146 · Philadelphia CountyPhone(215) 893-2548
Source: Dmand AI Affiliation Data
Dr. William Neal Duffy is affiliated with 2 sites of care and 1 medical group
Dr. Duffy's primary practice is Penn Medicine | Good Shepherd Rehabilitation Specialty Hospital in Philadelphia, Pennsylvania, part of University of Pennsylvania. The medical group on file is Clinical Care Associates (CCA), Penn Medicine. Dmand AI also links Dr. Duffy to 1 more hospital, 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 Neal Duffy's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Duffy practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Penn Medicine | Good Shepherd Rehabilitation Specialty Hospital | 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 Neal Duffy is one of 5,665 internists in Pennsylvania
Internal medicine is Dr. Duffy's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Duffy is licensed in Pennsylvania.
Specialties and state licenses
- Internal medicine, PennsylvaniaPrimary
Internists near Dr. Duffy
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 Neal Duffy billed Medicare for 1,195 services in 2024
CMS data shows 1,195 Medicare services from Dr. Duffy across 14 procedure codes in 2024, for 234 Medicare patients. Medicare paid $108,675 for them. Every service was in an office.
Dr. Duffy's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5622024: 5864%
- Other services
- 2023: 2332024: 34347%
- Tests and treatments
- 2023: 1282024: 25398%
- Lab and pathology
- 2023: 242024: 1346%
Dr. Duffy compared with the Pennsylvania median for internists, 2024
- Dr. Duffy
- Pennsylvania median
- Medicare services
- 1,195vs 4172.9 times
- Medicare patients
- 234vs 18526% above
- Part D claims
- 2,688vs 22412.0 times
Medians across 5,518 internists in Pennsylvania with Dmand AI profiles that report each measure.
Dr. Duffy'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 Neal Duffy treated 234 Medicare patients in 2024, average age 74
CMS counts 234 Medicare patients who saw Dr. Duffy in 2024. The largest group is 75 to 84, with 103 patients. 71% of them have high cholesterol, and 62% have high blood pressure. Their average risk score is 1.00, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Duffy's median patient age at 72, with 45% women.
Dr. Duffy's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Duffy's Medicare patients by sex, 2024
- Women10947%
- Men12553%
Chronic conditions among Dr. Duffy's Medicare patients, 2024
- High cholesterol71%
- High blood pressure62%
- Arthritis40%
- Diabetes22%
- Ischemic heart disease22%
- Osteoporosis19%
- Atrial fibrillation17%
- Cancer17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Duffy's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women45%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Neal Duffy wrote 3,299 Medicare Part D claims in 2024
In 2024, Dr. Duffy wrote 3,299 Medicare Part D claims for 311 patients. 87% of them were for generic drugs. CMS names the drug for 2,688 of them, across 74 drugs with 11 or more claims each, at $225,834 in total drug cost. In 2023, CMS named 2,301 claims across 74 drugs.
Dr. Duffy's Part D claims by kind of drug, 2024
- Generic2,885 claims87%
- Brand-name398 claims12%
- Other16 claims0%
Dr. Duffy'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.
Drug classes CMS tracks in Dr. Duffy's Part D claims, 2024
- Opioids1%29 of 3,299 claims
- Antibiotics4%138 of 3,299 claims
- Antipsychotics, patients 65 and over0%13 of 3,299 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,3012024: 2,68817%
Drugs named by CMS: 74 in 2024, 74 in 2023.
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 Neal Duffy graduated from Georgetown University School of Medicine
Dr. Duffy graduated from Georgetown University School of Medicine in 1993.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William Neal Duffy'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 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) |
| 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 Neal Duffy
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 Neal Duffy's NPI number?
Dr. William Neal Duffy's NPI number is 1538108055. It was assigned on June 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William Neal Duffy?
Dr. William Neal Duffy is an internist in Philadelphia, Pennsylvania. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William Neal Duffy practice?
Dr. Duffy practices at 1800 Lombard Street, Philadelphia, PA 19146. Dr. Duffy's primary practice is Penn Medicine | Good Shepherd Rehabilitation Specialty Hospital in Philadelphia, Pennsylvania, part of University of Pennsylvania. Dmand AI also links Dr. Duffy to 1 hospital.
What is Dr. William Neal Duffy's office phone number?
The practice phone on file for Dr. Duffy is (215) 893-2548.
What is Dr. William Neal Duffy's medical license number?
Dr. Duffy holds Pennsylvania license MD060436L.
Which hospitals is Dr. William Neal Duffy affiliated with?
Dr. Duffy practices at Penn Medicine | Good Shepherd Rehabilitation Specialty Hospital in Philadelphia, Pennsylvania. Dmand AI links Dr. Duffy to 1 more hospital.
What medical group is Dr. William Neal Duffy part of?
Dr. Duffy is linked to Clinical Care Associates (CCA), Penn Medicine.
Does Dr. William Neal Duffy accept Medicare?
Yes. CMS data shows Dr. Duffy billed Medicare for 1,195 services in 2024.
How many Medicare patients does Dr. William Neal Duffy see?
CMS counts 234 Medicare patients who saw Dr. Duffy in 2024, with an average age of 74.
What services does Dr. William Neal Duffy bill to Medicare?
In 2024, Dr. Duffy's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99215) and medicare service (G0439).
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Where did Dr. William Neal Duffy go to medical school?
Dr. Duffy graduated from Georgetown University School of Medicine in 1993.
What drugs does Dr. William Neal Duffy prescribe most?
In 2024 Medicare Part D data, Dr. Duffy's most prescribed drugs by claims were Amlodipine Besylate, Rosuvastatin Calcium and Atorvastatin Calcium.
How long has Dr. William Neal Duffy been practicing?
Dr. Duffy graduated from medical school in 1993, 33 years ago.
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