Justin Duffy, PA-C
NPI 1174918809 · Physician Assistant · Mchenry, IL
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Duffy, PA-C is a Physician Assistant provider in Mchenry, IL (NPI 1174918809).
Provider details
- NPI number
- 1174918809
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 0110008240 (VA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
31 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 31 | $70 |
Typical Medicare-allowed amounts for these services range $70–$70 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Tartrate | 69 | 38 |
| Atorvastatin Calcium | 33 | 14 |
| Pantoprazole Sodium | 28 | 16 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 27 | 13 |
| Amiodarone Hcl | 25 | 18 |
| Potassium Chloride | 24 | 24 |
| Furosemide | 22 |
Practice location
Mailing address
Additional practice locations (2)
- 424 Savannah RdLewes, DE 19958-1462Phone: (302) 644-4282Fax: (302) 644-8734
- 431 Savannah RdLewes, DE 19958-1460Phone: (302) 644-4282Fax: (302) 644-8734
Registry dates
- Enumerated
- 2015-03-31
- Last updated
- 2025-01-20
- Certified
- 2025-01-20
Frequently asked questions
- What is Justin Duffy's NPI number?
- Justin Duffy's National Provider Identifier (NPI) is 1174918809, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Duffy's specialty?
- Justin Duffy is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Justin Duffy located?
- Justin Duffy's practice location on file with NPPES is 4309 W Medical Center Dr Ste A200, Mchenry, IL 60050-8437.
- What is Justin Duffy's phone number?
- The practice phone number listed in the NPPES registry for Justin Duffy is (815) 759-8070.
- Does Justin Duffy accept Medicare?
- Justin Duffy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Duffy's NPI active?
- Yes — Justin Duffy's NPI (1174918809) is active in the NPPES registry as of the last update on 2025-01-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.