Callista O'Brien, PA-C

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

MA065644 Issued in PA

Practice address

2701 Shillington Rd Ste 100
Reading, PA 19608-1732

Phone

(484) 822-6170

NPI assigned

Aug 5, 2024

Last updated

Aug 25, 2026By the provider in NPPES

Sex

Female

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 PA

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 1

Specialty

Physician Assistant

Education

Other, 2024

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

St Joseph Medical GroupGroup PAC ID 3779688650, 190 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Penn State Health St. Joseph Hospital, Reading, PA, CCN 390096

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

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.

• St. Joseph Medical Group

  • Family Medicine Physician
  • Reading, PA
  • NPI 1184754657
  Medicare reassignment Care Compare group NPD

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

• St Joseph Regional Health Network

  dba Penn State Health St Joseph

  • General Acute Care Hospital
  • Reading, PA
  • NPI 1699734665
  Care Compare affiliation

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

{
    "created_epoch": "1722816000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787616000000",
    "number": "1023848140",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "500 UNIVERSITY DR",
            "address_2": "MC CA410",
            "city": "HERSHEY",
            "state": "PA",
            "postal_code": "170332360",
            "telephone_number": "800-243-1455"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2701 SHILLINGTON RD STE 100",
            "city": "READING",
            "state": "PA",
            "postal_code": "196081732",
            "telephone_number": "484-822-6170"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "CALLISTA",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2024-08-05",
        "last_updated": "2026-08-25",
        "certification_date": "2026-08-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "PA",
            "license": "MA065644",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Erica Nowotarski
• Lacey Nowotarski
• NSL Wyomissing LLC (Wyomissing Health and Rehabilitation Center)
• Constance Sherry Nunan
• Nurselect, LLC
• Maria L. O'Brien, PTA
• Susan M O'Hayer, PSY.D.
• Jo-Ann O'Rourke, M.D.
• Melanie Occansey
• Occupational Health Centers of the Southwest P.a. (Concentra Medical Centers)

• Physician Assistant in Reading, PA
• Providers in Reading, PA by specialty
• Physician Assistant in Pennsylvania

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 25, 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.