Margaret Duffy, MD
NPI 1518233881 · Nephrology Physician · Allentown, PA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Duffy, MD is a Nephrology Physician provider in Allentown, PA (NPI 1518233881).
Provider details
- NPI number
- 1518233881
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD461963 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1,595 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 533 | $75 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 301 | $99 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 278 | $16 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 150 | $124 |
| Hemodialysis Procedure With Physician Evaluation90935 | 133 | $67 |
| Chronic Care Management Services for Two Or More Chronic Conditions, Additional 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Dapagliflozin Propanediolbrand: Farxiga | 126 | 28 |
| Losartan Potassium | 114 | 38 |
| Amlodipine Besylate | 80 | 23 |
| Torsemide | 65 | 23 |
| Calcium Acetate | 56 | 18 |
| Spironolactone | 52 | 18 |
| Calcitriol | 51 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$266 across 4 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
- 2012-03-30
- Last updated
- 2022-07-21
- Certified
- 2022-05-31
Frequently asked questions
- What is Margaret Duffy's NPI number?
- Margaret Duffy's National Provider Identifier (NPI) is 1518233881, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Duffy's specialty?
- Margaret Duffy is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Duffy located?
- Margaret Duffy's practice location on file with NPPES is 1230 S Cedar Crest Blvd Stes 301, 302, 304, Allentown, PA 18103-6212.
- What is Margaret Duffy's phone number?
- The practice phone number listed in the NPPES registry for Margaret Duffy is (610) 432-4529.
- Does Margaret Duffy accept Medicare?
- Margaret Duffy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Duffy's NPI active?
- Yes — Margaret Duffy's NPI (1518233881) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.