Benjamin Williams Diffenderfer , PA-C
Physician Assistant • Bel Air, MD
510 Upper Chesapeake Dr., Suite 417, Physicians Pavillion Ii
Bel Air, MD 21014
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Benjamin Diffenderfer is listed in NPPES under Physician Assistant.
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NPI assigned on September 30, 2011; this date does not establish years in practice.
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Published CMS data list 24,520 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- J0897 — Injection, denosumab, 1 mg: 12,180 service units.
- J3111 — Injection, romosozumab-aqqg, 1 mg: 11,340 service units.
- 99213 — Established patient outpatient office visit: 405 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 14 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 431 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Alendronate Sodium — 142 prescription fills, including refills.
- Tymlos (Abaloparatide) — 90 prescription fills, including refills.
- Oxycodone Hcl — 57 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 11 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 95% of clinicians listed under Physician Assistant in Bel Air, MD (2024, 32 clinicians with data). Median for this group: 652. Middle half: 200 to 1,324.
More Medicare Part B services than 95% of clinicians listed under Physician Assistant in Maryland (2024, 1,555 clinicians with data). Median for this group: 282. Middle half: 86 to 792.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 5,067 in 2020 to 24,520 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
510 Upper Chesapeake Dr., Suite 417
Physicians Pavillion Ii
Bel Air, MD 21014
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 2 distinct group names: Agape Physical Therapy And Sports Rehabilitation Lp; Upper Chesapeake Orthopedics, Llc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
2011
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
524 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $510,385 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $402,289 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
810 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$529,059 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $3,329.64 across 21 records.
By nature of payment (3 largest of 4)
- Honoraria: $2,100.00 across 1 record.
- Travel and Lodging: $578.89 across 2 records.
- Food and Beverage: $475.75 across 17 records.
Reporting-company totals (3 largest of 4)
- Radius Health, Inc.: $2,921.99 across 10 records.
- Amgen Inc.: $322.79 across 8 records.
- Baxter Healthcare: $66.42 across 2 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
15 years (graduated 2011)
CMS Doctors and Clinicians data list 2011 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2011
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Benjamin Diffenderfer has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Benjamin Diffenderfer as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Bel Air and Maryland
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under Physician Assistant in Bel Air, MD (2024, 32 clinicians with data). Median for this group: 652. Middle half: 200 to 1,324.
More Medicare Part B services than 95% of clinicians listed under Physician Assistant in Maryland (2024, 1,555 clinicians with data). Median for this group: 282. Middle half: 86 to 792.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under Physician Assistant in Bel Air, MD (2024, 32 clinicians with data). Median for this group: $39,337. Middle half: $16,577 to $64,546.
A higher Medicare-allowed amount than 95% of clinicians listed under Physician Assistant in Maryland (2024, 1,555 clinicians with data). Median for this group: $23,780. Middle half: $8,384 to $55,296.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Physician Assistant in Bel Air, MD (2024, 32 clinicians with data). Median for this group: $29,650. Middle half: $12,504 to $49,103.
A higher Medicare payment amount than 95% of clinicians listed under Physician Assistant in Maryland (2024, 1,555 clinicians with data). Median for this group: $17,933. Middle half: $6,264 to $41,140.
Medicare Part D prescriptions
More Part D prescriptions than 80% of clinicians listed under Physician Assistant in Bel Air, MD (2024, 31 clinicians with data). Median for this group: 167. Middle half: 85 to 391.
More Part D prescriptions than 70% of clinicians listed under Physician Assistant in Maryland (2024, 1,444 clinicians with data). Median for this group: 160. Middle half: 54 to 492.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in Bel Air, MD (2024, 31 clinicians with data). Median for this group: $3,971. Middle half: $917 to $14,113.
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in Maryland (2024, 1,444 clinicians with data). Median for this group: $2,321. Middle half: $444 to $33,452.
57 active clinicians are listed under Physician Assistant with a practice address in Bel Air, MD (3,225 in Maryland).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Bel Air
14% of these 57 clinicians have the CMS telehealth indicator.
66.7% of these 57 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 384% from 5,067 in 2020 to 24,520 in 2024.
- 2020: 5,067
- 2021: 7,025
- 2022: 34,489
- 2023: 40,529
- 2024: 24,520
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Medicare-allowed amount
Medicare-allowed amount increased 300% from $127,589 in 2020 to $510,385 in 2024.
- 2020: $127,589
- 2021: $185,609
- 2022: $487,792
- 2023: $605,966
- 2024: $510,385
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Paid by Medicare
Paid by Medicare increased 309% from $98,273 in 2020 to $402,289 in 2024.
- 2020: $98,273
- 2021: $145,108
- 2022: $382,504
- 2023: $475,928
- 2024: $402,289
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 439% from 80 in 2020 to 431 in 2024.
- 2020: 80
- 2021: 144
- 2022: 340
- 2023: 379
- 2024: 431
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30-day fills
30-day fills increased 427% from 154 in 2020 to 810 in 2024.
- 2020: 154
- 2021: 238
- 2022: 518
- 2023: 649
- 2024: 810
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Part D drug cost
Part D drug cost went from $792 in 2020 to $529,059 in 2024.
- 2020: $792
- 2021: $79,723
- 2022: $343,687
- 2023: $344,923
- 2024: $529,059
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $311.08 in 2021 to $3,329.64 in 2025.
- 2021: $311.08
- 2022: $1,630.14
- 2023: $2,370.67
- 2024: $2,857.71
- 2025: $3,329.64
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): 21 records totaling $3,329.64.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Radius Health, Inc. |
Honoraria
Cash or cash equivalent
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Tymlos | General | $2,100.00 |
| Radius Health, Inc. |
Travel and Lodging
Cash or cash equivalent
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Tymlos | General | $483.97 |
| Amgen Inc. |
Consulting Fee
Cash or cash equivalent
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PROLIA | General | $175.00 |
| Radius Health, Inc. |
Food and Beverage
In-kind items and services
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— | General | $132.27 |
| Radius Health, Inc. |
Travel and Lodging
Cash or cash equivalent
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Tymlos | General | $94.92 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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— | General | $71.67 |
| Baxter Healthcare |
Food and Beverage
In-kind items and services
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PERCLOT | General | $36.51 |
| Radius Health, Inc. |
Food and Beverage
Cash or cash equivalent
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Tymlos | General | $31.95 |
| Baxter Healthcare |
Food and Beverage
In-kind items and services
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TISSEEL | General | $29.91 |
| Radius Health, Inc. |
Food and Beverage
In-kind items and services
|
— | General | $26.06 |
| Getinge USA Sales, LLC |
Food and Beverage
In-kind items and services
|
YUNO II MOBILE OPERATING TABLE | General | $18.44 |
| Radius Health, Inc. |
Food and Beverage
In-kind items and services
|
— | General | $17.11 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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EVENITY | General | $15.04 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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EVENITY | General | $13.98 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $13.58 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $13.10 |
| Radius Health, Inc. |
Food and Beverage
Cash or cash equivalent
|
Tymlos | General | $12.85 |
| Radius Health, Inc. |
Food and Beverage
In-kind items and services
|
— | General | $12.75 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $10.39 |
| Radius Health, Inc. |
Food and Beverage
In-kind items and services
|
Tymlos | General | $10.11 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $10.03 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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J0897
Injection, denosumab, 1 mg
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12,180 | 135 | $76.00 | $25.70 |
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J3111
Injection, romosozumab-aqqg, 1 mg
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11,340 | 12 | $33.00 | $10.72 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
|
405 | 261 | $283.00 | $80.07 |
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96372
Injection of drug or substance under skin or into muscle
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260 | 143 | $45.00 | $12.67 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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67 | 67 | $350.00 | $96.66 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
|
57 | 55 | $171.95 | $48.57 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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51 | 50 | $400.00 | $113.20 |
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27447
Replacement of knee joint, both sides of knee
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38 | 37 | $654.52 | $184.37 |
|
99205
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more
|
34 | 34 | $689.00 | $195.25 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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28 | 28 | $523.00 | $148.00 |
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20610
Aspiration and/or injection of fluid from large joint
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22 | 15 | $277.57 | $78.19 |
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27130
Replacement of thigh bone and hip joint with prosthesis
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16 | 16 | $681.89 | $187.17 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
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11 | 11 | $563.00 | $159.57 |
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99221
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes
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11 | 11 | $256.00 | $72.24 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Alendronate Sodium | Alendronate Sodium | 142 | 11,286 | $1,433.53 | 48 |
| Tymlos | Abaloparatide | 90 | 4,440 | $391,554.00 | 22 |
| Oxycodone Hcl | Oxycodone Hcl | 57 | 302 | $257.55 | 53 |
| Teriparatide | Teriparatide | 30 | 1,064 | $77,170.00 | — |
| Risedronate Sodium | Risedronate Sodium | 25 | 2,142 | $2,842.87 | — |
| Cefadroxil | Cefadroxil | 21 | 177 | $93.61 | 21 |
| Ibandronate Sodium | Ibandronate Sodium | 16 | 1,454 | $679.60 | — |
| Meloxicam | Meloxicam | 15 | 435 | $42.53 | — |
| Forteo | Teriparatide | 13 | 364 | $54,871.69 | — |
| Gabapentin | Gabapentin | 11 | 321 | $36.82 | 11 |
| Tramadol Hcl | Tramadol Hcl | 11 | 72 | $76.43 | — |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20111128000127
MD
9032383278
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Agape Physical Therapy And Sports Rehabilitation Lp
12 Newport Dr, Forest Hill, MD 210501758
Upper Chesapeake Orthopedics, Llc
510 Upper Chesapeake Dr, Bel Air, MD 210144336
Phone: 4436433130
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Family Medicine - Sports Medicine
Doctor of Medicine (M.D.), Master of Business Administration
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Physician Assistant - Surgical
Physician Assistant (Certified)
Orthopaedic Surgery - Adult Reconstructive Orthopaedic Surgery
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated September 30, 2011.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Physician Assistants in Bel Air
- Kimberly Bagwell, PA-C
- Roy Rothenberg, PA-C
- Lydia Gladfelter, PA
- Donna Kern, PA-C
- Kimberly Mcarthur, PA
- Kristine Bizzarro, PA-C
Mailing Address
510 Upper Chesapeake Dr., Suite 417, Physicians Pavillion Ii
Bel Air, MD 21014
Phone: 4436433130