Gary A Haag, DO

Primary specialty

Anesthesiology PhysicianTaxonomy code 207L00000X

License

H38515 Issued in MD

Practice address

1840 Amherst St
Winchester, VA 22603

Phone

(540) 536-8000

NPI assigned

Feb 1, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Eligible to order & refer

• Part B services: No
• Medical equipment: Yes
• Home health: No
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy, Doctor of Medicine

State licenses

Practice roles

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.

• Longview Anesthesiology Group, PC

  • Anesthesiology Physician
  • Longview, WA
  • NPI 1003894957

  Anesthesiology

  NPD (past)
• Southeast Anesthesia PC

  • Anesthesiology Physician
  • Cartersville, GA
  • NPI 1750419693

  Anesthesiology

  NPD (past)

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

{
    "created_epoch": "1138752000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1801868237",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 3295",
            "city": "WINCHESTER",
            "state": "VA",
            "postal_code": "226042495",
            "telephone_number": "540-662-8336",
            "fax_number": "540-662-8593"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1840 AMHERST ST",
            "city": "WINCHESTER",
            "state": "VA",
            "postal_code": "22603",
            "telephone_number": "540-536-8000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HAAG",
        "first_name": "GARY",
        "middle_name": "A",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-02-01",
        "last_updated": "2026-07-13",
        "certification_date": "2022-08-16",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "MD",
            "license": "H38515",
            "primary": true
        },
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "VA",
            "license": "0102201159",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "005708257",
            "state": "VA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Katherine Hawkins Gustin, MD
• Shawna W Guthrie, DPT
• Michael Patrick Gwaltney, DDS
• Gwi Nutrition Services LLC
• Melissa Ann Haack, RBT
• Stacie Seaborn Haaga, RD
• Christopher David Haake, PMHNP-BC
• Kaley Nicole Haass
• Heather Habaqe, LPC
• John E Habeck, NP

• All providers in Winchester, VA
• Anesthesiology Physician in Virginia

• 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.