Ryan P Osullivan DDS PLLC

Primary specialty

Orthodontics and Dentofacial Orthopedics DentistryTaxonomy code 1223X0400X

Legal business name

RYAN P OSULLIVAN DDS PLLC

Doing business as

Hillside Orthodontics

Practice address

1998 N College Ave
Fayetteville, AR 72703-2609

Phone

(479) 222-1118

NPI assigned

Sep 30, 2026

Last updated

Sep 30, 2026By the provider in NPPES

Organization subpart

No

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

Authorized official

Name

Ryan O'Sullivan, D.D.S. MSNPI 1073966917

Title

Owner

Phone

(918) 232-0395

Specialties & licenses 1

Addresses

Other names 1

• Hillside Orthodontics Doing business as

Practitioners 1

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

• Ryan Patrick O'Sullivan, D.D.S.

  • Orthodontics and Dentofacial Orthopedics Dentistry
  • Fayetteville, AR
  • NPI 1073966917
  Authorized official Same address or phone

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

{
    "created_epoch": "1790726400000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1790726400000",
    "number": "1174437891",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1998 N COLLEGE AVE",
            "city": "FAYETTEVILLE",
            "state": "AR",
            "postal_code": "727032609",
            "telephone_number": "479-222-1118"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1998 N COLLEGE AVE",
            "city": "FAYETTEVILLE",
            "state": "AR",
            "postal_code": "727032609",
            "telephone_number": "479-222-1118"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "RYAN P OSULLIVAN DDS PLLC",
        "organizational_subpart": "NO",
        "enumeration_date": "2026-09-30",
        "last_updated": "2026-09-30",
        "certification_date": "2026-09-30",
        "status": "A",
        "authorized_official_last_name": "O'SULLIVAN",
        "authorized_official_first_name": "RYAN",
        "authorized_official_title_or_position": "OWNER",
        "authorized_official_telephone_number": "918-232-0395",
        "authorized_official_credential": "D.D.S. MS"
    },
    "taxonomies": [
        {
            "code": "1223X0400X",
            "taxonomy_group": "",
            "desc": "Dentist, Orthodontics and Dentofacial Orthopedics",
            "state": "NU",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "Hillside Orthodontics",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

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• Orthodontics and Dentofacial Orthopedics Dentistry in Fayetteville, AR
• Providers in Fayetteville, AR by specialty
• Orthodontics and Dentofacial Orthopedics Dentistry in Arkansas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 30, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.

Verify at the official NPI Registry.