Kristi A Mahlmann, FNP-BC

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

AP61026558 Issued in WA

Practice address

1420 Ahtanum Ridge Dr
Union Gap, WA 98903-1839

Phone

(509) 454-7700

Fax

(509) 454-7710

NPI assigned

Jan 28, 2020

Last updated

Sep 12, 2025By 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

Other names 1

• Kristi A Seiders-Werner Former name

Medicare fee-for-service enrollment

Enrolled in WA, TX2 enrollments

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 2

Specialty

Nurse Practitioner

Education

Other, 2019

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

SHC Medical Center ToppenishGroup PAC ID 4082980065, shared by 3 NPIs, 43 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Astria Sunnyside Hospital Hospital, Sunnyside, WA, CCN 501330
• Astria Toppenish Hospital Hospital, Toppenish, WA, CCN 500037
• Yakima Valley Memorial Hospital, Yakima, WA, CCN 500036

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine, Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: kwerner@landmarkhealth-direct.org

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.

• SHC Medical Center Toppenish

  dba Astria Toppenish Hospital

  • General Acute Care Hospital
  • Toppenish, WA
  • NPI 1851817308
  Medicare reassignment NPD
• Sunnyside Community Hospital Association

  dba Astria Sunnyside Hospital

  • Critical Access Hospital
  • Sunnyside, WA
  • NPI 1225033814
  Medicare reassignment NPD
• Sunnyside Community Hospital Association

  dba Astria Health Center

  • Rural Health Clinic/Center
  • Sunnyside, WA
  • NPI 1679521637
  Medicare reassignment NPD (past)
• US Health Dept of Health & Human Services

  • Rural Health Clinic/Center
  • Poplar, MT
  • NPI 1972694602

  TX

  Medicare reassignment
• SHC Medical Center Toppenish

  dba Astria Health Center

  • Rural Health Clinic/Center
  • Union Gap, WA
  • NPI 1013492784
  NPD
• Sunnyside Community Hospital Association

  dba Astria Health Center

  • Rural Health Clinic/Center
  • Sunnyside, WA
  • NPI 1407289184

  Family

  NPD
• Sunnyside Community Hospital Association

  dba Astria Health Center

  • Clinic/Center
  • Yakima, WA
  • NPI 1609395060
  NPD
• Sunnyside Community Hospital Association

  • Cardiovascular Disease Physician
  • Sunnyside, WA
  • NPI 1871986455
  NPD
• U S Health Dept of Health & Human Services

  dba Lodge Grass Clinic

  • Critical Access Hospital
  • Lodge Grass, MT
  • NPI 1750410395
  NPD
• US Health Dept of Health & Human Services

  dba Crow/Northern Cheyenne Hospital

  • Critical Access Hospital
  • Crow Agency, MT
  • NPI 1548393358
  NPD
• SHC Medical Center Toppenish

  dba Astria Health Center

  • Rural Health Clinic/Center
  • Toppenish, WA
  • NPI 1316422892
  NPD (past)
• Sunnyside Community Hospital Association

  dba Astria Health Center

  • Rural Health Clinic/Center
  • Sunnyside, WA
  • NPI 1851397426
  NPD (past)

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

• SHC Medical Center Toppenish

  dba Astria Toppenish Hospital

  • General Acute Care Hospital
  • Toppenish, WA
  • NPI 1851817308
  Care Compare affiliation
• Sunnyside Community Hospital Association

  dba Astria Sunnyside Hospital

  • Critical Access Hospital
  • Sunnyside, WA
  • NPI 1225033814
  Care Compare affiliation
• Yakima Valley Memorial Hospital Association

  dba MultiCare Yakima Memorial Hospital

  • General Acute Care Hospital
  • Yakima, WA
  • NPI 1053373480
  Care Compare affiliation

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

{
    "created_epoch": "1580169600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757635200000",
    "number": "1215568357",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 719",
            "city": "SUNNYSIDE",
            "state": "WA",
            "postal_code": "989440719",
            "telephone_number": "509-837-1617",
            "fax_number": "509-837-4908"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1420 AHTANUM RIDGE DR",
            "city": "UNION GAP",
            "state": "WA",
            "postal_code": "989031839",
            "telephone_number": "509-454-7700",
            "fax_number": "509-454-7710"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1812 E Edison Ave",
            "address_purpose": "LOCATION",
            "city": "Sunnyside",
            "state": "WA",
            "postal_code": "98944",
            "country_code": "US",
            "telephone_number": "509-712-3295",
            "fax_number": "509-837-1700",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MAHLMANN",
        "first_name": "KRISTI",
        "middle_name": "A",
        "credential": "FNP-BC",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2020-01-28",
        "last_updated": "2025-09-12",
        "certification_date": "2025-09-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "WA",
            "license": "AP61026558",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "KRISTI",
            "last_name": "SEIDERS-WERNER",
            "middle_name": "A",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Chun T Lai
• Vu Le, MD
• Adrian Francisco Llamas-Lopez, PHARMACIST
• Robert Long
• Luxottica Retail North America Inc (Sears Optical #C0182)
• Nancy Liu Matsuura, PHARMD
• Teresa McCulloch
• Medi-Center Group (Valley Medi-Center)
• Rick Kenneth Melcher, RPH
• Kassandra Mendez

• Family Nurse Practitioner in Union Gap, WA
• Providers in Union Gap, WA by specialty
• Family Nurse Practitioner in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 12, 2025; 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.