Alexander Duffy, MD
NPI 1639732464 · Otolaryngology Physician · Philadelphia, PA
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Duffy, MD is a Otolaryngology Physician provider in Philadelphia, PA (NPI 1639732464).
Provider details
- NPI number
- 1639732464
- Entity type
- Individual
- Primary specialty
- Otolaryngology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD490457 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
7 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,919 across 10 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
- 2019-04-17
- Last updated
- 2026-01-16
- Certified
- 2026-01-16
Frequently asked questions
- What is Alexander Duffy's NPI number?
- Alexander Duffy's National Provider Identifier (NPI) is 1639732464, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Duffy's specialty?
- Alexander Duffy is listed in the NPPES registry with a primary specialty of Otolaryngology Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Duffy located?
- Alexander Duffy's practice location on file with NPPES is 3509 N Broad St, Philadelphia, PA 19140-4105.
- What is Alexander Duffy's phone number?
- The practice phone number listed in the NPPES registry for Alexander Duffy is (844) 570-1767.
- Does Alexander Duffy accept Medicare?
- Alexander Duffy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Duffy's NPI active?
- Yes — Alexander Duffy's NPI (1639732464) is active in the NPPES registry as of the last update on 2026-01-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.