DR. GERARD JOHN DIEFES M.D.
NPI 1417948951
Internal Medicine - Pulmonary Disease in Wynnewood, PA
About Dr. Gerard John Diefes M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GERARD JOHN DIEFES M.D. (NPI 1417948951) is an individual pulmonary disease provider in Wynnewood, Pennsylvania, licensed in Pennsylvania (MD056949L) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Paoli Hospital, and maintains a secondary practice location in Exton.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Gerard John Diefes M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 11
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Paoli Hospital
Acute Care Hospitals · Paoli, PAChester County Hospital
Acute Care Hospitals · West Chester, PASt Mary Medical Center
Acute Care Hospitals · Langhorne, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 19096 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Referred Medical Equipment & Supplies CMS DME claims 19
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WYNNEWOOD, PA 19096
WYNNEWOOD, PA 19096
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Gerard Diefes's NPI number?
The NPI number for Gerard Diefes is 1417948951. It was assigned to this individual provider in the NPPES registry on November 3, 2005.
Where is Gerard Diefes located?
Gerard Diefes practices at 1001 City Line Ave Wb 113, Wynnewood, PA 19096. The listed phone number is (610) 896-0280.
What is Gerard Diefes's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.
Is Gerard Diefes enrolled in Medicare?
Yes. Gerard Diefes is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Is Gerard Diefes affiliated with any hospitals?
According to CMS data, Gerard Diefes is affiliated with Paoli Hospital, Chester County Hospital and St Mary Medical Center.
When was this NPI record last updated?
The NPPES record for Gerard Diefes was last updated on May 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
