Benjamin Diffenderfer, PA-C
NPI 1679857239 · Physician Assistant · Bel Air, MD
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Benjamin Diffenderfer, PA-C is a Physician Assistant provider in Bel Air, MD (NPI 1679857239).
Provider details
- NPI number
- 1679857239
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- Yes
- License
- C0004567 (MD)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
14 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,000 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 405 | $80 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 260 | $13 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 67 | $97 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 57 | $49 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 51 | $113 |
| Replacement of Knee Joint, Both Sides of Knee |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Alendronate Sodium | 142 | 48 |
| Abaloparatidebrand: Tymlos | 90 | 22 |
| Oxycodone Hcl | 57 | 53 |
| Teriparatide | 30 | — |
| Risedronate Sodium | 25 | — |
| Cefadroxil | 21 | 21 |
| Ibandronate Sodium | 16 | — |
| Meloxicam | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,858 across 11 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-09-30
- Last updated
- 2011-09-30
Frequently asked questions
- What is Benjamin Diffenderfer's NPI number?
- Benjamin Diffenderfer's National Provider Identifier (NPI) is 1679857239, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Benjamin Diffenderfer's specialty?
- Benjamin Diffenderfer is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Benjamin Diffenderfer located?
- Benjamin Diffenderfer's practice location on file with NPPES is 510 Upper Chesapeake Dr., Suite 417, Bel Air, MD 21014.
- What is Benjamin Diffenderfer's phone number?
- The practice phone number listed in the NPPES registry for Benjamin Diffenderfer is (443) 643-3130.
- Does Benjamin Diffenderfer accept Medicare?
- Benjamin Diffenderfer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Benjamin Diffenderfer's NPI active?
- Yes — Benjamin Diffenderfer's NPI (1679857239) is active in the NPPES registry as of the last update on 2011-09-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.