DR. GERARD JOHN DIEFES M.D. NPI 1417948951

NPI Information

  • NPI: 1417948951
  • Provider Name: DR. GERARD JOHN DIEFES, M.D.
  • Classification: Internal Medicine - 207RP1001X
  • Specialization: Pulmonary Disease
  • Entity Type: Individual
  • PECOS Registration: Yes
  • Address: 1001 CITY LINE AVE
    WB 113
    WYNNEWOOD, PA
    ZIP 19096
  • Phone: (610) 896-0280

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NPI Details

DR. Gerard John Diefes, M.D. is a pulmonary disease internal medicine in Wynnewood, PA with 34 years of experience. The provider is an internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs. DR. Gerard John Diefes, M.D. NPI is 1417948951. The provider is registered as an individual entity type.

The NPPES NPI record indicates the provider is a male.

Education
Medical School: HAHNEMANN UNIVERSITY COLLEGE OF MEDICINE
Graduation Year:1992

The provider's business location address is:

1001 CITY LINE AVE
WB 113
WYNNEWOOD, PA
ZIP 19096-902
Phone: (610) 896-0280
Fax: (610) 896-0286

The NPI 1417948951 is registered in the Medicare Provider, Enrollment, Chain and Ownership System (PECOS). The provider is legally eligible to order and refer Part B (Clinical Laboratory and Imaging), Durable Medical Equipment, Part A Home Health Agency (HHA), Power Mobility Devices.

The following top HCPCS codes were publicly reported for this provider under the Medicare program for the year 2016. The reported codes are based on the top codes for each available Medicare specialty, excluding evaluation and management codes.

  • Follow-up hospital inpatient care per day, typically 25 minutes (HCPCS:99232)
  • Follow-up hospital inpatient care per day, typically 35 minutes (HCPCS:99233)
  • Critical care, first 30-74 minutes (HCPCS:99291)
  • Established patient office or other outpatient visit, 30-39 minutes (HCPCS:99214)
  • Initial hospital inpatient care per day, typically 70 minutes (HCPCS:99223)
  • Hospital discharge day management, more than 30 minutes (HCPCS:99239)
  • Initial hospital inpatient care per day, typically 50 minutes (HCPCS:99222)
  • Test to determine lung volumes using gas dilution or washout (HCPCS:94727)
  • Test to examine how well the lungs exchange gases (HCPCS:94729)
  • Telephone medical discussion with physician, 11-20 minutes (HCPCS:99442)
  • Test to measure expiratory airflow and volume changes before and after medication administration (HCPCS:94060)
  • Test to measure expiratory airflow and volume (HCPCS:94010)

The enumeration date for this NPI number is 11/3/2005 and was last updated on 5/20/2025.

Taxonomy Codes

The NPI record includes the healthcare provider taxonomy classification, state license number and state of licensure. The following information regarding the scope of practice of this provider is available:

No. Taxonomy Code Taxonomy Clasification Taxonomy Specialization License Number License State Primary
1207RC0200XInternal MedicineCritical Care MedicineMD056949LPENNSYLVANIANo
2207RS0012XInternal MedicineSleep MedicineMD056949LPENNSYLVANIANo
3207RP1001XInternal MedicinePulmonary DiseaseMD056949LPENNSYLVANIAYes

Other Identifiers

The following information regarding additional identifiers associated to this NPI record includes the other identifier number, identifier type, identifier state and issuer.

No. Other Provider Identifier Other Provider Identifier Type Other Provider Identifier State Other Provider Identifier Issuer
1001781333MEDICAIDPENNSYLVANIA

What is NPI?

NPI stands for National Provider Identifier. The NPI is a 10-digit identification number that is completely unique. The NPI number by itself does not contain any identifiable information such as a provider’s speciality or location. The NPI is assigned to individuals or organizacions for their lifespan and it is independent of key provider information type updates like a change of practices, location or speciality.

This page was last updated on: 11/21/2025

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