Donald S. Diefendorf, P.A.-C

Primary specialty

Medical Physician AssistantTaxonomy code 363AM0700X

License

MA002841L Issued in PA

Practice address

2700 Quarry Lake Dr Ste 300
Baltimore, MD 21209

Phone

(410) 377-8900

Fax

(410) 377-0576

NPI assigned

Jun 30, 2006

Last updated

Dec 5, 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 2

Addresses

Medicare fee-for-service enrollment

Enrolled in MD, PA2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 2

Specialty

Physician Assistant

Education

Other, 1998

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Wellspan Medical GroupGroup PAC ID 1951213115, 2,438 clinicians

Phoenix Rehabilitation and Health Services IncGroup PAC ID 3476464298, shared by 2 NPIs, 2,775 clinicians

Dr Jeffrey D. Gaber and Associates, P.a.Group PAC ID 5991748931, 9 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Gettysburg Hospital Hospital, Gettysburg, PA, CCN 390065
• Mercy Medical Center Inc Hospital, Baltimore, MD, CCN 210008

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: donald.diefendorf.1@20053.direct.athenahealth.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.

• Dr Jeffrey D. Gaber & Associates, P.a.

  • Internal Medicine Physician
  • Baltimore, MD
  • NPI 1356488076
  Medicare reassignment Care Compare group
• Wellspan Medical Group

  dba WellSpan Digestive Health

  • Gastroenterology Physician
  • York, PA
  • NPI 1669770004
  Medicare reassignment Care Compare group
• Wellspan Medical Group

  dba WellSpan Pediatric Surgical Specialist

  • Pediatric Surgery Physician
  • York, PA
  • NPI 1104799428
  NPD
• Wellspan Medical Group

  dba Wellspan Family Medicine - Stonebridge

  • Family Medicine Physician
  • New Freedom, PA
  • NPI 1629146709
  NPD
• Frederick Health Hospital Inc

  dba Frederick Health Hospital

  • General Acute Care Hospital
  • Frederick, MD
  • NPI 1538165527
  NPD (past)
• Midatlantic Cardiovascular Associates PA

  • Cardiovascular Disease Physician
  • Baltimore, MD
  • NPI 1821084112
  NPD (past)
• Wellspan Medical Group

  dba Wellspan Nephrology

  • Nephrology Physician
  • York, PA
  • NPI 1821159021
  NPD (past)

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

• Mercy Medical Center Inc

  • General Acute Care Hospital
  • Baltimore, MD
  • NPI 1144282583
  Care Compare affiliation
• The Gettysburg Hospital

  dba WellSpan Gettysburg Hospital SPU

  • Ambulatory Surgical Clinic/Center
  • Gettysburg, PA
  • NPI 1184882011

  Hospital

  Care Compare affiliation
• The Gettysburg Hospital

  • General Acute Care Hospital
  • Gettysburg, PA
  • NPI 1265466957
  Care Compare affiliation

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

{
    "created_epoch": "1151625600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1764892800000",
    "number": "1437187002",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "601 MEMORY LN",
            "city": "YORK",
            "state": "PA",
            "postal_code": "174022123",
            "telephone_number": "717-851-1405"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2700 QUARRY LAKE DR STE 300",
            "city": "BALTIMORE",
            "state": "MD",
            "postal_code": "21209",
            "telephone_number": "410-377-8900",
            "fax_number": "410-377-0576"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1227 Baltimore St",
            "address_purpose": "LOCATION",
            "city": "Hanover",
            "state": "PA",
            "postal_code": "173314406",
            "country_code": "US",
            "telephone_number": "717-812-2055",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "DIEFENDORF",
        "first_name": "DONALD",
        "middle_name": "S.",
        "credential": "P.A.-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-30",
        "last_updated": "2025-12-05",
        "certification_date": "2025-12-05",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363AM0700X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Medical",
            "state": "PA",
            "license": "MA002841L",
            "primary": true
        },
        {
            "code": "363AM0700X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Medical",
            "state": "MD",
            "license": "C0002134",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Christina Marie Dicristofaro, RN
• Manjiri Mukund Didolkar, MD, MS
• Mukund S. Didolkar, M.D.
• Susan R Didonato, MA, LCPC
• Emily Diedrich
• Beth Carol Diehl Svrjcek, CRNP
• Barbara Lynn Diehl, MA LCPC
• Jordan Diehl, RN
• Kenneth W Diehl Jr., PSYD
• Matthew Steven Diehl, PHARMD

• Medical Physician Assistant in Baltimore, MD
• Providers in Baltimore, MD by specialty
• Medical Physician Assistant in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 5, 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.