Aaron Lee Haag, DO

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

OS022136 Issued in PA

Practice address

500 University Dr
Hershey, PA 17033-2360

Phone

(800) 243-1455

NPI assigned

Apr 1, 2019

Sex

Male

Sole proprietor

Yes

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: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

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 and National Provider Directory roles.

• Allegheny Clinic

  • Family Medicine Physician
  • Bethel Park, PA
  • NPI 1073081493
  Medicare reassignment NPD
• Allegheny Clinic

  • Primary Care Clinic/Center
  • Pittsburgh, PA
  • NPI 1215752548
  NPD
• Allegheny Clinic

  • Obstetrics & Gynecology Physician
  • Pittsburgh, PA
  • NPI 1477989465
  NPD

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

{
    "created_epoch": "1554076800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782172800000",
    "number": "1669934600",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "500 UNIVERSITY DR",
            "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": "500 UNIVERSITY DR",
            "city": "HERSHEY",
            "state": "PA",
            "postal_code": "170332360",
            "telephone_number": "800-243-1455"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "4727 Friendship Ave Ste 200",
            "address_purpose": "LOCATION",
            "city": "Pittsburgh",
            "state": "PA",
            "postal_code": "152241778",
            "country_code": "US",
            "telephone_number": "412-235-5810",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1307 Federal St Ste B300",
            "address_purpose": "LOCATION",
            "city": "Pittsburgh",
            "state": "PA",
            "postal_code": "152124775",
            "country_code": "US",
            "telephone_number": "412-359-3751",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HAAG",
        "first_name": "AARON",
        "middle_name": "LEE",
        "credential": "DO",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2019-04-01",
        "last_updated": "2026-06-23",
        "certification_date": "2026-06-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "PA",
            "license": "OS022136",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Naina Gurung, CRNP
• Rhonda H Gusherowski, CRNP
• Theresa Gustafson, RD
• Patrick Gut
• Nhuna Ha
• Kristin Haag
• Sabeen Y Habib, M.D.
• Gretchen Louise Hackett, D.O.
• Nicole M Hackman, M.D.
• Mohammad Amin Hadavand

• Internal Medicine Physician in Hershey, PA
• Providers in Hershey, PA by specialty
• Internal Medicine Physician in Pennsylvania

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 23, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.