William L Diehl, M.D.

Primary specialty

Surgical Oncology PhysicianTaxonomy code 2086X0206X

License

25MA04355800 Issued in NJ

Practice address

75 E Northfield Rd
Livingston, NJ 07039-4532

Phone

(973) 436-1530

Fax

(973) 422-0414

NPI assigned

Oct 24, 2005

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 NJ

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

General SurgeryAlso: Surgical Oncology

Education

Other, 1981

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Summit Medical Group PAGroup PAC ID 5395642276, 1,204 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Morristown Medical Center Hospital, Morristown, NJ, CCN 310015
• Ahs Hospital Corp Hospital, Hackettstown, NJ, CCN 310115
• Kessler Rehab Center Inpatient rehabilitation facility, West Orange, NJ, CCN 313025

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: william.diehl.1@2983.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 and National Provider Directory roles.

• Summit Medical Group PA

  • Multi-Specialty Clinic/Center
  • Berkeley Heights, NJ
  • NPI 1942254347
  Medicare reassignment Care Compare group NPD
• Summit Medical Group PA

  • Durable Medical Equipment & Medical Supplies
  • Hackensack, NJ
  • NPI 1043930555
  NPD
• Summit Medical Group, Inc

  • Family Medicine Physician
  • Erlanger, KY
  • NPI 1750343216

  Surgery

  NPD (past)

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

• Ahs Hospital Corp

  • General Acute Care Hospital
  • Hackettstown, NJ
  • NPI 1518969419
  Care Compare affiliation
• Ahs Hospital Corp.

  • General Acute Care Hospital
  • Morristown, NJ
  • NPI 1053384776
  Care Compare affiliation
• Kessler Institute for Rehabilitation Inc

  • Rehabilitation Hospital
  • West Orange, NJ
  • NPI 1013919620

  Inpatient rehabilitation facility

  Care Compare affiliation

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

{
    "created_epoch": "1130112000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771200000000",
    "number": "1629068457",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "261 JAMES ST",
            "address_2": "SUITE 2G",
            "city": "MORRISTOWN",
            "state": "NJ",
            "postal_code": "079606392",
            "telephone_number": "973-267-6400",
            "fax_number": "973-267-7295"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "75 E NORTHFIELD RD",
            "city": "LIVINGSTON",
            "state": "NJ",
            "postal_code": "070394532",
            "telephone_number": "973-436-1530",
            "fax_number": "973-422-0414"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DIEHL",
        "first_name": "WILLIAM",
        "middle_name": "L",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-10-24",
        "last_updated": "2026-02-16",
        "certification_date": "2026-02-16",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2086X0206X",
            "taxonomy_group": "",
            "desc": "Surgery, Surgical Oncology",
            "state": "NJ",
            "license": "25MA04355800",
            "primary": true
        },
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "NJ",
            "license": "25MA04355800",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Navdeep Dhillon, MD
• Hema Dholakia, M.D.
• Diagnostic Pathology, PA
• Gigi Diamond, M.D.
• Nechama Diamond, PA
• Joseph Difrancisco, OTR/L
• Jedd Easton Dillman, CRNA
• Aurora Dimarco, PA
• Lily Ryan Dimartino, PA-C
• Elysa Faith Dinzes, R.D

• Surgical Oncology Physician in Livingston, NJ
• Providers in Livingston, NJ by specialty
• Surgical Oncology Physician in New Jersey

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 16, 2026; 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.