Owen Joseph O'Neill, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

176762 Issued in NY

Practice address

777 N Broadway
Suite 310
Sleepy Hollow, NY 10591-1000

Phone

(914) 333-0034

Fax

(912) 333-0046

NPI assigned

Jun 8, 2006

Last updated

Jul 13, 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 1

Addresses

Medicare fee-for-service enrollment

Enrolled in NY

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

Internal MedicineAlso: Undersea and Hyperbaric Medicine

Education

Other, 1987

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Practice addresses (Care Compare)

Hospital & facility affiliations

• Phelps Hospital Hospital, Sleepy Hollow, NY, CCN 330261
• Memorial Hospital for Cancer and Allied Diseases Hospital, New York, NY, CCN 330154

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://fhir.meditouchehr.com/api/fhir/r4/
• Direct secure messaging: ooneill66618@northwell.direct-ci.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.

• Westchester Hyperbaric Medicine and Wound Care, PC

  • Undersea and Hyperbaric Medicine (Preventive Medicine) Physician
  • Sleepy Hollow, NY
  • NPI 1255372017

  Internal Medicine

  Medicare reassignment NPD Authorized official
• Westchester Internal Medicine PC

  • Internal Medicine Physician
  • Sleepy Hollow, NY
  • NPI 1245279660
  NPD (past) Authorized official

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

• Memorial Hospital for Cancer and Allied Diseases

  • General Acute Care Hospital
  • New York, NY
  • NPI 1700887411
  Care Compare affiliation
• Phelps Memorial Hospital Association

  dba Phelps Hospital

  • General Acute Care Hospital
  • Sleepy Hollow, NY
  • NPI 1720185267
  Care Compare affiliation
• Ralph Lauren Center for Cancer Care and Prevention

  • Special Hospital
  • New York, NY
  • NPI 1770046351
  Care Compare affiliation
• Memorial Hospital for Cancer & Allied Diseases

  • General Acute Care Hospital
  • Basking Ridge, NJ
  • NPI 1659385474
  Care Compare affiliation
• Memorial Sloan Kettering Bergen

  • General Acute Care Hospital
  • Montvale, NJ
  • NPI 1841650330
  Care Compare affiliation
• Memorial Sloan Kettering Monmouth

  • General Acute Care Hospital
  • Middletown, NJ
  • NPI 1528428521
  Care Compare affiliation

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

{
    "created_epoch": "1149724800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1447290119",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "777 N BROADWAY",
            "address_2": "SUITE 310",
            "city": "SLEEPY HOLLOW",
            "state": "NY",
            "postal_code": "105911000",
            "telephone_number": "914-333-0034",
            "fax_number": "912-333-0046"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "777 N BROADWAY",
            "address_2": "SUITE 310",
            "city": "SLEEPY HOLLOW",
            "state": "NY",
            "postal_code": "105911000",
            "telephone_number": "914-333-0034",
            "fax_number": "912-333-0046"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'NEILL",
        "first_name": "OWEN",
        "middle_name": "JOSEPH",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-08",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NY",
            "license": "176762",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jimmy Jose Nunez, DPT
• Johaen Barchinsky Nunez, RN
• Dina R Nunziato, LCSW
• Rolla Nuoman
• Nymc Phelps Family Medicine Residency Program
• Stanley J. Oiseth, M.D.
• Oana Monica Olteanu, MD
• Ada Onwe
• Open Door Family Medical Center Inc
• Kristi Geneviere Orlando, NP

• Internal Medicine Physician in Sleepy Hollow, NY
• Providers in Sleepy Hollow, NY by specialty
• Internal Medicine Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.