NPIMap

Individual provider Active NPI

Margaret Lynn Meyer, MD

  • Orthopaedic Surgery Physician
  • Sonoma, CA
National Provider Identifier
1639289358
Registry record updated Feb 18, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Orthopaedic Surgery PhysicianTaxonomy code 207X00000X
License
A88282 Issued in CA
Practice address
181 Andrieux St
Ste #111
Sonoma, CA 95476-6920
Phone
(707) 996-8017
Fax
(707) 996-8061
NPI assigned
Aug 30, 2006
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Feb 18, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Orthopaedic Surgery Physician 207X00000X A88282 CA Primary

Addresses

Primary practice location

181 Andrieux St
Ste #111
Sonoma, CA 95476-6920

Mailing address

PO Box 1722
181 Andrieux St Ste #111
Sonoma, CA 95476-6920
Phone (707) 996-8017

Other practice location 1

3901 Stewart Ave
Wausau, WI 54401-3948
Phone (715) 907-0900

Other identifiers 2

IdentifierTypeStateIssuer
P00239692OtherRAILROAD MEDICARE
00A882820MedicaidCA

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address Margaret.Meyer@orthoassocwau.directbygreenway.com

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA, WI2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20040914000330 CA Practitioner - Orthopedic Surgery 3072409911 Reassigns benefits to 1 organization
I20190501000403 WI Practitioner - Orthopedic Surgery 3072409911 Reassigns benefits to 3 organizations

Care Compare profile

Medicare Care Compare
Specialty
Orthopedic Surgery
Education
Temple University School of Medicine, 1998
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Synergy Surgicalists PCGroup PAC ID 2860768330, 14 clinicians
Orthopaedic Centers of Wisconsin S CGroup PAC ID 4981679552, 58 clinicians
Aspirus Medical Group, Inc.Group PAC ID 1052223625, 272 clinicians

Practice addresses (Care Compare)

155 Glasson Way
Suite L30
Grass Valley, CA 95945-5723
Phone (856) 759-4765

3901 Stewart Ave
Wausau, WI 54401-3948
Phone (715) 907-0900

444 E Timberland Dr
Rhinelander, WI 54501-2852
Phone (715) 369-2300

Hospital & facility affiliations

  • Sierra Nevada Memorial Hospital Hospital, Grass Valley, CA, CCN 050150
  • Aspirus Wausau Hospital Hospital, Wausau, WI, CCN 520030
  • Aspirus Rhinelander Hospital Hospital, Rhinelander, WI, CCN 520019

Merit-based Incentive Payment System (MIPS)

Final score
87.53 of 100Reported as group
Quality
77.62
Promoting interoperability
100
Improvement activities
40
Cost
78.08

Merit-based Incentive Payment System (MIPS)

Final score
97.05 of 100Reported as apm
Quality
89.81
Promoting interoperability
100
Improvement activities
40

Merit-based Incentive Payment System (MIPS)

Final score
79.57 of 100Reported as group
Quality
77.2
Promoting interoperability
59
Improvement activities
40
Cost
88.86

Procedures performed for Medicare patients

ProcedureNumber of procedures
Knee replacement1-10
Removal of tissue1-10

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
A88282CAMDOrthopaedic Surgery Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Aspirus Medical Group, Inc. CurrentSince Apr 1, 2024 Accepting new patients
Synergy Surgicalists PC Orthopaedic Surgery CurrentSince Dec 16, 2025 Accepting new patients
Orthopaedic Centers of Wisconsin S C CurrentSince May 1, 2019 Accepting new patients
Aspirus Rhinelander & Tomahawk Hospitals & Clinics, Inc. CurrentSince Apr 1, 2024 Accepting new patients
Orthopaedic Centers of Wisconsin S C Orthopaedic Surgery CurrentSince May 1, 2019 Accepting new patients
Aspirus Medical Group, Inc. Current Accepting new patients
Aspirus Rhinelander & Tomahawk Hospitals & Clinics, Inc. CurrentSince Apr 1, 2024 Accepting new patients
Aspirus Medical Group, Inc. CurrentSince Apr 1, 2024 Accepting new patients
Alii Health Center PastSince Feb 14, 2021 Accepting new patients
Orthopaedic Centers of Wisconsin S C Orthopaedic Surgery Past Accepting new patients
Orthopaedic Centers of Wisconsin S C Orthopaedic Surgery Past Accepting new patients
Aspirus Medical Group, Inc. Past Accepting new patients

Locations

155 Glasson Way
Ste L30
Grass Valley, CA 95945
Phone (856) 759-4765

29980 Network Pl
Chicago, IL 60673

400 W Glen St
Crandon, WI 54520
Phone (715) 478-3318

2251 N Shore Dr
Ste 100
Rhinelander, WI 54501
Phone (715) 361-2074

401 W Mohawk Dr
Ste 100
Tomahawk, WI 54487
Phone (715) 453-7700

401 W Mohawk Dr
Tomahawk, WI 54487
Phone (715) 453-7200

3901 Stewart Ave
Wausau, WI 54401
Phone (715) 841-0002

4005 Community Center Dr
Weston, WI 54476
Phone (715) 241-5400

Interoperability endpoints

  • Direct secure messaging: margaret.meyer@orthoassocwau.directbygreenway.com

Organizations & group practices 13

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.

View all 13

Hospital & facility affiliations 27

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

View all 27

NPI Registry JSON

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

{
    "created_epoch": "1156896000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771372800000",
    "number": "1639289358",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 1722",
            "address_2": "181 ANDRIEUX ST STE #111",
            "city": "SONOMA",
            "state": "CA",
            "postal_code": "954766920",
            "telephone_number": "707-996-8017",
            "fax_number": "707-996-8061"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "181 ANDRIEUX ST",
            "address_2": "STE #111",
            "city": "SONOMA",
            "state": "CA",
            "postal_code": "954766920",
            "telephone_number": "707-996-8017",
            "fax_number": "707-996-8061"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "3901 Stewart Ave",
            "address_purpose": "LOCATION",
            "city": "Wausau",
            "state": "WI",
            "postal_code": "544013948",
            "country_code": "US",
            "telephone_number": "715-907-0900",
            "fax_number": "715-803-6977",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MEYER",
        "first_name": "MARGARET",
        "middle_name": "LYNN",
        "name_prefix": "Ms.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-08-30",
        "last_updated": "2026-02-18",
        "certification_date": "2026-02-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207X00000X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery",
            "state": "CA",
            "license": "A88282",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "P00239692",
            "state": null
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00A882820",
            "state": "CA"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "Margaret.Meyer@orthoassocwau.directbygreenway.com",
            "affiliation": "N",
            "address_1": "3901 Stewart Ave",
            "city": "Wausau",
            "state": "WI",
            "country_code": "US",
            "postal_code": "544013948",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Sonoma, CA

Sources for this page

Verify at the official NPI Registry.