Stefanie Marie Dieffenbach, WHNP-BC

Primary specialty

Women's Health Nurse PractitionerTaxonomy code 363LW0102X

License

10025329 Issued in OR

Practice address

4400 NE Halsey St Ste 286
Portland, OR 97213-1545

Phone

(503) 729-5814

Fax

(503) 215-7062

NPI assigned

Apr 24, 2024

Last updated

Oct 15, 2026By the provider in NPPES

Sex

Female

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 OR

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

Nurse Practitioner

Education

Other, 2023

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Providence Health and Services OregonGroup PAC ID 0648183608, 1,423 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: sdieffenbach243496@oc.providencedirect.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.

• Providence Health & Services Oregon

  dba Providence Medical Group

  • General Practice Physician
  • Lake Oswego, OR
  • NPI 1023488343
  Medicare reassignment Care Compare group NPD
• Providence Health & Services Oregon

  dba Providence Medical Group

  • Adult Mental Health Clinic/Center
  • Portland, OR
  • NPI 1093963209
  NPD
• Providence Health & Services Oregon

  dba Providence Medical Group

  • Psychiatry Physician
  • Portland, OR
  • NPI 1760177737
  NPD
• Providence Health & Services - Oregon

  dba Providence Medical Group

  • Internal Medicine Physician
  • Sherwood, OR
  • NPI 1184729329
  NPD (past)
• Providence Medical Group, PC

  • Internal Medicine Physician
  • Atlanta, GA
  • NPI 1063570604
  NPD (past)

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

{
    "created_epoch": "1713916800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1792022400000",
    "number": "1033965744",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4400 NE HALSEY ST STE 286",
            "city": "PORTLAND",
            "state": "OR",
            "postal_code": "972131545",
            "telephone_number": "503-729-5814",
            "fax_number": "503-215-7062"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4400 NE HALSEY ST STE 286",
            "city": "PORTLAND",
            "state": "OR",
            "postal_code": "972131545",
            "telephone_number": "503-729-5814",
            "fax_number": "503-215-7062"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "4400 NE Halsey St Ste 285",
            "address_purpose": "LOCATION",
            "city": "Portland",
            "state": "OR",
            "postal_code": "972131545",
            "country_code": "US",
            "telephone_number": "503-215-6262",
            "fax_number": "503-234-5437",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "10330 SE 32nd Ave Ste 305",
            "address_purpose": "LOCATION",
            "city": "Milwaukie",
            "state": "OR",
            "postal_code": "972226596",
            "country_code": "US",
            "telephone_number": "503-513-1800",
            "fax_number": "503-513-1850",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "DIEFFENBACH",
        "first_name": "STEFANIE",
        "middle_name": "MARIE",
        "credential": "WHNP-BC",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2024-04-24",
        "last_updated": "2026-10-15",
        "certification_date": "2026-10-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LW0102X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Women's Health",
            "state": "OR",
            "license": "10025329",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Mary K Dictson, LPC
• Donald Patrick Didier, M.S.W.
• Lauren Didier
• Brandon Dieckmann, MSW
• Anna Colleen Diedesch, AU.D.
• Erika May Diehl
• Nicole Diehl
• Elizabeth Jane Dielentheis, BIRTH DOULA
• Seaanna Cecile Diemer
• Ananda Diener

• Women's Health Nurse Practitioner in Portland, OR
• Providers in Portland, OR by specialty
• Women's Health Nurse Practitioner in Oregon

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 15, 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.