William T Derosa, D.O.

Primary specialty

Medical Oncology PhysicianTaxonomy code 207RX0202X

License

25MB03927200 Issued in NJ

Practice address

95 Madison Ave
Morristown, NJ 07960-6092

Phone

(973) 538-5210

Fax

(973) 644-9657

NPI assigned

Oct 12, 2005

Last updated

Apr 8, 2026By 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 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

Medical OncologyAlso: Hematology

Education

At Still University of Health Sciences, College of Osteo Med, Kirksville, 1980

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Barnabas Health Medical Group PCGroup PAC ID 9537316955, 1,027 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Cooperman Barnabas Medical Center Hospital, Livingston, NJ, CCN 310076
• Morristown Medical Center Hospital, Morristown, NJ, CCN 310015

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: eearly@rcca.direct.varian.com
• Direct secure messaging: wderosa@rcca.direct.varian.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.

• Barnabas Health Medical Group PC

  • Specialist
  • Elizabeth, NJ
  • NPI 1841557246

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Regional Cancer Care Associates LLC

  • Hematology & Oncology Physician
  • Toms River, NJ
  • NPI 1801850243
  Medicare reassignment NPD
• Regional Cancer Care Associates

  • Hematology & Oncology Physician
  • Morristown, NJ
  • NPI 1215201298
  Authorized official Same address or phone
• Barnabas Health Medical Group PC

  • Durable Medical Equipment & Medical Supplies
  • Hackensack, NJ
  • NPI 1316772668
  NPD
• Regional Cancer Care Associates LLC

  • Hematology & Oncology Physician
  • Belleville, NJ
  • NPI 1447315502
  NPD
• Hematology-Oncology Associates of Northern New Jersey, PA

  • Hematology & Oncology Physician
  • Morristown, NJ
  • NPI 1013970813
  NPD (past)

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

• Ahs Hospital Corp.

  dba Morristown Medical Center

  • General Acute Care Hospital
  • Morristown, NJ
  • NPI 1053384776
  Care Compare affiliation
• Cooperman Barnabas Medical Center Inc

  • General Acute Care Hospital
  • Livingston, NJ
  • NPI 1396857488
  Care Compare affiliation

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

{
    "created_epoch": "1129075200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1775606400000",
    "number": "1902894991",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "95 MADISON AVE",
            "city": "MORRISTOWN",
            "state": "NJ",
            "postal_code": "079606092",
            "telephone_number": "973-538-5210",
            "fax_number": "973-644-9657"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "95 MADISON AVE",
            "city": "MORRISTOWN",
            "state": "NJ",
            "postal_code": "079606092",
            "telephone_number": "973-538-5210",
            "fax_number": "973-644-9657"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DEROSA",
        "first_name": "WILLIAM",
        "middle_name": "T",
        "credential": "D.O.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-10-12",
        "last_updated": "2026-04-08",
        "certification_date": "2026-04-08",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NJ",
            "license": "25MB03927200",
            "primary": false
        },
        {
            "code": "207RH0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology",
            "state": "NJ",
            "license": "25MB03927200",
            "primary": false
        },
        {
            "code": "207RX0202X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Medical Oncology",
            "state": "NJ",
            "license": "25MB03927200",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "1092502",
            "state": "NJ"
        }
    ],
    "endpoints": [],
    "other_names": []
}

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• Medical Oncology Physician in Morristown, NJ
• Providers in Morristown, NJ by specialty
• Medical Oncology Physician in New Jersey

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 8, 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.