Timothy M Sowerby, MD

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

A50116 Issued in CA

Practice address

3900 Lakeville Hwy
Petaluma, CA 94954-5698

Phone

(707) 765-3900

NPI assigned

Apr 11, 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

Electronic endpoints 1

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: Yes

Green means eligible to order or refer.

Enrollment records 1

Merit-based Incentive Payment System (MIPS)

Final score

81.03 of 100Reported as subgroup

Quality

80.86

Promoting interoperability

76

Improvement activities

40

Cost

75.91

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: tsowerby@maringastro.directbygreenway.com

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.

• Permanente Medical Group Inc

  • Internal Medicine Physician
  • Santa Clara, CA
  • NPI 1073606299
  Medicare reassignment NPD
• Regents Univ of California UCSF

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1124439807
  Medicare reassignment NPD
• Permanente Medical Group Inc

  • Internal Medicine Physician
  • Redwood City, CA
  • NPI 1639252604
  NPD
• Permanente Medical Group, Inc

  • Clinical Medical Laboratory
  • San Jose, CA
  • NPI 1497971584
  NPD

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

{
    "created_epoch": "1144713600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1768435200000",
    "number": "1063475952",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3900 LAKEVILLE HWY",
            "city": "PETALUMA",
            "state": "CA",
            "postal_code": "949545698",
            "telephone_number": "707-765-3900"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3900 LAKEVILLE HWY",
            "city": "PETALUMA",
            "state": "CA",
            "postal_code": "949545698",
            "telephone_number": "707-765-3900"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SOWERBY",
        "first_name": "TIMOTHY",
        "middle_name": "M",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-04-11",
        "last_updated": "2026-01-15",
        "certification_date": "2026-01-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CA",
            "license": "A050116",
            "primary": false
        },
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CA",
            "license": "A50116",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "SOAP",
            "endpointTypeDescription": "SOAP URL",
            "endpoint": "https://careepicwest.kp.org:14430/Interconnect-prodcalgateway/wcf/epic.community.hie/xcpdrespondinggatewaysync.svc/ncalceq",
            "affiliation": "N",
            "endpointDescription": "Carequality",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "C-CDA",
            "address_1": "275 W MacArthur Blvd",
            "city": "Oakland",
            "state": "CA",
            "country_code": "US",
            "postal_code": "946115641",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Sonoma Recovery Services, LLC
• Sonoma Therapeutic Arts and Education, a Psychological Corporation
• Emani Ann Sosa
• Kaitlin Elizabeth Soule, LMFT
• Priya Clarke Sowerby
• Speech Pathology Services of Marin Sonoma Incorportated
• Amanda Bernice Eyges Spencer, PSY.D.
• Jordan Dane Spencer
• Jennifer Kathryn Spengler
• Lewis Spengler

• Gastroenterology Physician in Petaluma, CA
• Providers in Petaluma, CA by specialty
• Gastroenterology Physician in California

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