Gerard John Diefes, M.D.

Primary specialty

Pulmonary Disease PhysicianTaxonomy code 207RP1001X

License

MD056949L Issued in PA

Practice address

1001 City Line Ave
WB 113
Wynnewood, PA 19096-3902

Phone

(610) 896-0280

Fax

(610) 896-0286

NPI assigned

Nov 3, 2005

Last updated

May 20, 2025By the provider in NPPES

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 3

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Enrolled in PA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Pulmonary DiseaseAlso: Critical Care (Intensivists), Internal Medicine, Sleep Medicine

Education

Hahnemann University College of Medicine, 1992

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Advocare, LLCGroup PAC ID 3678562188, 383 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Chester County Hospital Hospital, West Chester, PA, CCN 390179
• St Mary Medical Center Hospital, Langhorne, PA, CCN 390258
• Paoli Hospital Hospital, Paoli, PA, CCN 390153
• Hospital of Univ of Pennsylvania Hospital, Philadelphia, PA, CCN 390111

Merit-based Incentive Payment System (MIPS)

Final score

100 of 100Reported as individual

Quality

100

Improvement activities

40

Cost

81.7

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: gerard.diefes@advocaredoctors.eclinicaldirectplus.com
• Direct secure messaging: gerard.diefes@respiratoryassociates.chartmakerdirect.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Advocare, LLC

  • Pediatrics Physician
  • Marlton, NJ
  • NPI 1770538696

  PA

  Medicare reassignment Care Compare group NPD
• Respiratory Associates, LTD

  • Specialist
  • Wynnewood, PA
  • NPI 1073534939
  Medicare reassignment NPD
• Advocare , LLC

  dba Advocare Berlin Medical Associates (DME)

  • Internal Medicine Physician
  • Manahawkin, NJ
  • NPI 1912762162
  NPD
• Prime Healthcare Services Roxborough LLC

  dba Roxborough Memorial Hospital

  • General Acute Care Hospital
  • Philadelphia, PA
  • NPI 1083986129
  NPD (past)
• Advocare, LLC

  dba Advocare Merchantville Pediatrics

  • Pediatrics Physician
  • Cherry Hill, NJ
  • NPI 1780696732
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Chester County Hospital

  • General Acute Care Hospital
  • West Chester, PA
  • NPI 1356333579
  Care Compare affiliation
• Hospital of the University of PA

  • Ambulatory Fertility Facility
  • Phila, PA
  • NPI 1033262316

  Hospital

  Care Compare affiliation
• Main Line Hospitals, Inc.

  dba Paoli Hospital

  • General Acute Care Hospital
  • Paoli, PA
  • NPI 1215042114
  Care Compare affiliation
• St Mary Medical Center

  • General Acute Care Hospital
  • Langhorne, PA
  • NPI 1780686931
  Care Compare affiliation
• Trustees of the University of Pennsylvania

  dba Hospital of the University of Pennsylvania

  • General Acute Care Hospital
  • Philadelphia, PA
  • NPI 1851370910
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1130976000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1747699200000",
    "number": "1417948951",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1001 CITY LINE AVE",
            "address_2": "WB 113",
            "city": "WYNNEWOOD",
            "state": "PA",
            "postal_code": "190963902",
            "telephone_number": "610-896-0280",
            "fax_number": "610-896-0286"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1001 CITY LINE AVE",
            "address_2": "WB 113",
            "city": "WYNNEWOOD",
            "state": "PA",
            "postal_code": "190963902",
            "telephone_number": "610-896-0280",
            "fax_number": "610-896-0286"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "736 W Lincoln Hwy",
            "address_purpose": "LOCATION",
            "city": "Exton",
            "state": "PA",
            "postal_code": "193412547",
            "country_code": "US",
            "telephone_number": "610-359-5858",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "DIEFES",
        "first_name": "GERARD",
        "middle_name": "JOHN",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-11-03",
        "last_updated": "2025-05-20",
        "certification_date": "2025-05-20",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "PA",
            "license": "MD056949L",
            "primary": false
        },
        {
            "code": "207RP1001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "PA",
            "license": "MD056949L",
            "primary": true
        },
        {
            "code": "207RS0012X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Sleep Medicine",
            "state": "PA",
            "license": "MD056949L",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "001781333",
            "state": "PA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Joan Keegan Devine, D.O.
• Christine Margaret Devore-Craddock
• Tanpreet Dhanota
• Anna Nicole Diantonio, PA-C
• Aaron Dickinson, DO
• Laura Dimattia, AGACNP-BC
• Victoria Dimelis, MD
• Marissa Laura Diorio, FNP-C CRNP
• Eric David Dipasquale II
• Nancy R Dipietro, D.D.S.

• Pulmonary Disease Physician in Wynnewood, PA
• Providers in Wynnewood, PA by specialty
• Pulmonary Disease Physician in Pennsylvania

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 20, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.