Benjamin Williams Diffenderfer, PA-C
- Medicare patients, 2024
- 524
- Part D claims, 2024
- 514
- Hospital affiliations
- 1
- Industry payments
- $1,043
- Medical groups
- 2
- Practice address
- 510 Upper Chesapeake Drive, Suite 415, Bel Air, MD 21014
- Practice phone
- Call (443) 643-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
National Spine & Pain Centers - Bel Air
Surgery Center - Medicare-Certified · Bel Air, Maryland
Find Benjamin Diffenderfer'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.
Benjamin Williams Diffenderfer is a physician assistant in Bel Air, Maryland
Benjamin Diffenderfer practices at National Spine & Pain Centers - Bel Air in Bel Air, Maryland.
Benjamin Diffenderfer's NPI, 1679857239, was assigned on September 30, 2011. Benjamin Diffenderfer holds Maryland license C0004567.
- NPI
- 1679857239NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032383278
- NPI enumeration date
- September 30, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (443) 643-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Benjamin Williams Diffenderfer practices at National Spine & Pain Centers - Bel Air in Bel Air, Maryland
Benjamin Diffenderfer's primary practice is National Spine & Pain Centers - Bel Air, at 510 Upper Chesapeake Drive, Suite 415, Bel Air, MD 21014. The practice phone is (443) 643-3000.
- National Spine & Pain Centers - Bel Air510 Upper Chesapeake Drive, Suite 415, Bel Air, MD 21014Phone(443) 643-3000
Source: Dmand AI Affiliation Data
Benjamin Williams Diffenderfer is affiliated with 4 sites of care and 2 medical groups
Benjamin Diffenderfer's primary practice is National Spine & Pain Centers - Bel Air in Bel Air, Maryland. Benjamin Diffenderfer is also affiliated with University of Maryland Upper Chesapeake Medical Center Bel Air. The medical group on file is Agape Physical Therapy. Dmand AI also links Benjamin Diffenderfer to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Benjamin Williams Diffenderfer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Benjamin Diffenderfer practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| National Spine & Pain Centers - Bel Air | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Benjamin Williams Diffenderfer is one of 2,452 physician assistants in Maryland
Physician assistant is Benjamin Diffenderfer's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Benjamin Diffenderfer is licensed in Maryland.
Specialties and state licenses
- Physician assistant, MarylandPrimary
Physician assistants near Benjamin Diffenderfer
Counts of physician assistants 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
Benjamin Williams Diffenderfer treated 524 Medicare patients in 2024, average age 75
CMS counts 524 Medicare patients who saw Benjamin Diffenderfer in 2024. The largest group is 65 to 74, with 239 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 6% are also on Medicaid. Their average risk score is 1.03, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Benjamin Diffenderfer's median patient age at 74, with 90% women.
Benjamin Diffenderfer's Medicare patients by age, 2024
Benjamin Diffenderfer's Medicare patients by sex, 2024
- Women43282%
- Men9218%
Chronic conditions among Benjamin Diffenderfer's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Osteoporosis73%
- Arthritis58%
- Anxiety28%
- Mood disorders26%
- Ischemic heart disease24%
- Depression22%
Share of Medicare patients with each condition. A patient can have several.
Benjamin Diffenderfer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women90%
- Men9%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Benjamin Williams Diffenderfer wrote 514 Medicare Part D claims in 2024
In 2024, Benjamin Diffenderfer wrote 514 Medicare Part D claims for 196 patients. 71% of them were for generic drugs.
Benjamin Diffenderfer's Part D claims by kind of drug, 2024
- Generic367 claims71%
- Brand-name and other147 claims29%
Drug classes CMS tracks in Benjamin Diffenderfer's Part D claims, 2024
- Opioids18%90 of 514 claims
- Antibiotics5%25 of 514 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
Benjamin Williams Diffenderfer offers telehealth to Medicare patients
Benjamin Diffenderfer accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Benjamin Diffenderfer as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Benjamin Williams Diffenderfer received $1,043 in industry payments in 2025
CMS Open Payments shows 13 general payments to Benjamin Diffenderfer from 4 drug and device companies in 2025. Travel and lodging make up the largest share, 46% of the total. Radius Health, Inc. paid the most, $661.
General payments to Benjamin Diffenderfer by kind, 2025 to 2025
- Travel and lodging$48446%
- Food and beverage$38437%
- Consulting fees$17517%
Companies that paid Benjamin Diffenderfer 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 Benjamin Williams Diffenderfer'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 Benjamin Williams Diffenderfer
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Benjamin Williams Diffenderfer's NPI number?
Benjamin Williams Diffenderfer's NPI number is 1679857239. It was assigned on September 30, 2011, and it is active in the NPI Registry.
What does Benjamin Williams Diffenderfer specialize in?
Benjamin Williams Diffenderfer is a physician assistant in Bel Air, Maryland. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Benjamin Williams Diffenderfer practice?
Benjamin Diffenderfer practices at 510 Upper Chesapeake Drive, Suite 415, Bel Air, MD 21014. Benjamin Diffenderfer's primary practice is National Spine & Pain Centers - Bel Air in Bel Air, Maryland. Dmand AI also links Benjamin Diffenderfer to 2 group practices and clinics and 1 medical group.
What is Benjamin Williams Diffenderfer's office phone number?
The practice phone on file for Benjamin Diffenderfer is (443) 643-3000.
What is Benjamin Williams Diffenderfer's medical license number?
Benjamin Diffenderfer holds Maryland license C0004567.
Which hospitals is Benjamin Williams Diffenderfer affiliated with?
Benjamin Diffenderfer is affiliated with University of Maryland Upper Chesapeake Medical Center Bel Air.
What medical group is Benjamin Williams Diffenderfer part of?
Benjamin Diffenderfer is linked to Agape Physical Therapy. Dmand AI links Benjamin Diffenderfer to 1 more medical group.
Does Benjamin Williams Diffenderfer accept Medicare?
Yes. CMS lists Benjamin Diffenderfer as accepting Medicare assignment.
Does Benjamin Williams Diffenderfer offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Benjamin Diffenderfer as offering telehealth services.
How many Medicare patients does Benjamin Williams Diffenderfer see?
CMS counts 524 Medicare patients who saw Benjamin Diffenderfer in 2024, with an average age of 75.
Has Benjamin Williams Diffenderfer received payments from drug or device companies?
CMS Open Payments shows $1,043 in general payments to Benjamin Diffenderfer from 4 companies from 2025 to 2025. The largest total came from Radius Health, Inc.
How long has Benjamin Williams Diffenderfer been practicing?
Benjamin Diffenderfer graduated from medical school in 2011, 15 years ago.
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