DR. GERARD JOHN DIEFES (M.D.) – Pulmonary Disease Physician, NPI 1417948951
Pulmonary Disease Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,086 PULMONARY DISEASE in PA
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Provider Addresses for DR. GERARD JOHN DIEFES (M.D.)
1001, City Avenue, Overbrook, West Philadelphia, Lower Merion Township, Montgomery County, Pennsylvania, 19096, United States
WB 113
WYNNEWOOD, PA 190963902
Phone: (610) 896-0280
Fax: (610) 896-0286
Type: Mailing
736 W Lincoln Hwy
Exton, PA 193412547
Phone: (610) 359-5858
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 105 Open Payments records for all available years, with a total value of $2,344.
Total Amount is formed as General ($2,344) + Research ($0) + Ownership ($0) = $2,344.
Last reported payment date: 2024-12-23 • Largest payer in this snapshot: GlaxoSmithKline, LLC. ($689).
Total Amount
$2,344
General + Research + Ownership
Payments
105
Total payment records
General Amount
$2,344
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-23
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GlaxoSmithKline, LLC. | $689 |
| AstraZeneca Pharmaceuticals LP | $321 |
| Regeneron Healthcare Solutions, Inc. | $208 |
| Insmed, Inc. | $204 |
| GENZYME CORPORATION | $150 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2005-06-13
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20050613000167 | I | Pulmonary Disease | PA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 973 | 163 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 204 | 93 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 128 | 80 | $0 |
| 99291 | Critical care, first 30-74 minutes | 127 | 49 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 84 | 77 | $0 |
Insurance plans in this area (ZIP 19096)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| O P H T H A L M O L O G Y | NJ | |
| - | NJ | |
| O T O L A R Y N G O L O G Y | NY | |
| - | NJ | |
| E N D O C R I N O L O G Y | NJ | |
| Internal Medicine | NJ | |
| Physician Assistant | NJ | |
| O B S T E T R I C S/ G Y N E C O L O G Y | NJ | |
| Family Practice | NJ | |
| Internal Medicine | NJ |
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