Lia Armstrong Wystrach, BSN, RN, MN, FNP-C

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

95035870 Issued in CA

Practice address

1100 Larkspur Landing Cir Ste 10
Larkspur, CA 94939-1836

Phone

(415) 924-1214

NPI assigned

Jul 24, 2019

Last updated

Jul 21, 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 2

Addresses

Other names 1

• Lia Marguerite Armstrong Former name

Medicare fee-for-service enrollment

Enrolled in CA

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, 2019

Medicare assignment

May accept Medicare assignment

Telehealth

Offers telehealth services

Group practices

Regents Univ of California UCSFGroup PAC ID 6305160300, 276 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Marinhealth Medical Center Hospital, Greenbrae, CA, CCN 050360
• Adventist Health Portland Hospital, Portland, OR, CCN 380060
• Novato Community Hospital Hospital, Novato, CA, CCN 050131

Merit-based Incentive Payment System (MIPS)

Final score

92 of 100Reported as group

Quality

84.7

Promoting interoperability

100

Improvement activities

40

Cost

79.21

Medicare enrollment (NPD)

Enrolled

Credentials

Bachelor on Science - Nursing, Nurse Practitioner, Registered Nurse

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: lwystrach153345@direct.ohsu.edu
• Direct secure messaging: lwystrach449240@direct-ucsfmedicalcenter.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.

• Regents Univ of California UCSF

  dba UCSF Physician Group

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1124439807
  Medicare reassignment Care Compare group NPD
• Walla Walla General Hospital

  dba Adventist Health Medical Group

  • Rural Health Clinic/Center
  • Walla Walla, WA
  • NPI 1992958771
  NPD (past)

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

• Marin General Hospital

  • General Acute Care Hospital
  • Greenbrae, CA
  • NPI 1396725677
  Care Compare affiliation
• Sutter Bay Hospitals

  • General Acute Care Hospital
  • Novato, CA
  • NPI 1104059153
  Care Compare affiliation
• Portland Adventist Medical Center

  dba Adventist Health Portland

  • General Acute Care Hospital
  • Portland, OR
  • NPI 1801887658
  Care Compare affiliation

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

{
    "created_epoch": "1563926400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1753056000000",
    "number": "1326692708",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4114 NE ROYAL CT APT A",
            "city": "PORTLAND",
            "state": "OR",
            "postal_code": "972322677",
            "telephone_number": "650-576-2558"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1100 LARKSPUR LANDING CIR STE 10",
            "city": "LARKSPUR",
            "state": "CA",
            "postal_code": "949391836",
            "telephone_number": "415-924-1214"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "10151 SE Sunnyside Rd Ste 100",
            "address_purpose": "LOCATION",
            "city": "Clackamas",
            "state": "OR",
            "postal_code": "970156913",
            "country_code": "US",
            "telephone_number": "503-659-0880",
            "fax_number": "503-513-7425",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "WYSTRACH",
        "first_name": "LIA",
        "middle_name": "ARMSTRONG",
        "credential": "BSN, RN, MN, FNP-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2019-07-24",
        "last_updated": "2025-07-21",
        "certification_date": "2025-07-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "OR",
            "license": "201906215NP-PP",
            "primary": false
        },
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "CA",
            "license": "95035870",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "LIA",
            "last_name": "ARMSTRONG",
            "middle_name": "MARGUERITE",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Rachel Lea White
• Melanie S Wice, NP RN CNM
• Alexander Widas, BS, LMT, CHT, REV
• Julie Williamson, M.O.T., OTR/L, CHT
• Laura Winner, DPT
• Jerald A. Young, M.D.
• Jason Chit Lum Yu, PT,DPT,OMT,ATC,CSCS
• Monika Ilona Zacharewicz
• Zachary Schwab, MD

• Family Nurse Practitioner in Larkspur, CA
• Providers in Larkspur, CA by specialty
• Family Nurse Practitioner in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 21, 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.