Gerard Diefes, M.D.
NPI 1417948951 · Pulmonary Disease Physician · Wynnewood, PA
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gerard Diefes, M.D. is a Pulmonary Disease Physician provider in Wynnewood, PA (NPI 1417948951).
Provider details
- NPI number
- 1417948951
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD056949L (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,631 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 | 822 | $83 |
| Critical Care, First 30-74 Minutes99291 | 212 | $225 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 175 | $125 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 142 | $137 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 68 | $121 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 63 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 266 | 64 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 238 | 49 |
| Prednisone | 128 | 49 |
| Montelukast Sodium | 86 | 17 |
| Umeclidinium Brm/Vilanterol Trbrand: Anoro Ellipta | 57 | — |
| Gabapentin | 47 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,228 across 53 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
Additional practice locations (1)
- 736 W Lincoln HwyExton, PA 19341-2547Phone: (610) 359-5858
Registry dates
- Enumerated
- 2005-11-03
- Last updated
- 2025-05-20
- Certified
- 2025-05-20
Frequently asked questions
- What is Gerard Diefes's NPI number?
- Gerard Diefes's National Provider Identifier (NPI) is 1417948951, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gerard Diefes's specialty?
- Gerard Diefes is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Gerard Diefes located?
- Gerard Diefes's practice location on file with NPPES is 1001 City Line Ave, Wynnewood, PA 19096-3902.
- What is Gerard Diefes's phone number?
- The practice phone number listed in the NPPES registry for Gerard Diefes is (610) 896-0280.
- Does Gerard Diefes accept Medicare?
- Gerard Diefes is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gerard Diefes's NPI active?
- Yes — Gerard Diefes's NPI (1417948951) is active in the NPPES registry as of the last update on 2025-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.