Michelle Sit, MD

Primary specialty

Rheumatology PhysicianTaxonomy code 207RR0500X

License

0101238150 Issued in VA

Practice address

1010 Nut Tree Rd Ste 100a
Vacaville, CA 95687-4172

Phone

(707) 624-8532

Fax

(707) 624-8501

NPI assigned

Jan 11, 2006

Sex

Female

Sole proprietor

No

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

Specialties & licenses 3

Addresses

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

Specialty

Rheumatology

Education

Other, 2003

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Northbay Physicians Surgery Center, LLCGroup PAC ID 0042122244, 336 clinicians

Northbay Health Medical FoundationGroup PAC ID 3274010871, 207 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Northbay Medical Center Hospital, Fairfield, CA, CCN 050367
• Sutter Medical Center, Sacramento Hospital, Sacramento, CA, CCN 050108
• Sutter Davis Hospital Hospital, Davis, CA, CCN 050537

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: msit248205@hisp.ehr.sutterhealth.org

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.

• Northbay Health Medical Foundation

  dba NorthBay Health Medical Network

  • Internal Medicine Physician
  • Fairfield, CA
  • NPI 1760283527
  Medicare reassignment Care Compare group NPD
• Northbay Healthcare Group

  dba dba NorthBay Medical Center

  • General Acute Care Hospital
  • Fairfield, CA
  • NPI 1821147786
  Medicare reassignment Care Compare group NPD
• Northbay Healthcare Group

  dba NorthBay VacaValley Hospital

  • Multi-Specialty Clinic/Center
  • Vacaville, CA
  • NPI 1760534713

  Rheumatology

  NPD
• Sutter Valley Medical Foundation

  dba Sutter Gould Medical Foundation

  • Multi-Specialty Clinic/Center
  • Modesto, CA
  • NPI 1669846986

  Internal Medicine

  NPD
• Sutter Valley Medical Foundation

  • Durable Medical Equipment & Medical Supplies
  • Tracy, CA
  • NPI 1720930712
  NPD

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

• Northbay Healthcare Group

  dba dba NorthBay Medical Center

  • General Acute Care Hospital
  • Fairfield, CA
  • NPI 1821147786
  Care Compare affiliation
• Sutter Valley Hospitals

  dba Sutter Davis Hospital

  • General Acute Care Hospital
  • Davis, CA
  • NPI 1770532608
  Care Compare affiliation
• Sutter Valley Hospitals

  • General Acute Care Hospital
  • Sacramento, CA
  • NPI 1811946734
  Care Compare affiliation

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

{
    "created_epoch": "1136937600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767744000000",
    "number": "1740269513",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1010 NUT TREE RD STE 100A",
            "city": "VACAVILLE",
            "state": "CA",
            "postal_code": "956874172",
            "telephone_number": "707-624-8530",
            "fax_number": "707-624-8501"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1010 NUT TREE RD STE 100A",
            "city": "VACAVILLE",
            "state": "CA",
            "postal_code": "956874172",
            "telephone_number": "707-624-8532",
            "fax_number": "707-624-8501"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIT",
        "first_name": "MICHELLE",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-01-11",
        "last_updated": "2026-01-07",
        "certification_date": "2026-01-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RR0500X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Rheumatology",
            "state": "CA",
            "license": "C-188321",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "VA",
            "license": "0101238150",
            "primary": false
        },
        {
            "code": "207RR0500X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Rheumatology",
            "state": "VA",
            "license": "0101238150",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Simran Preet Singh Kaur
• Christine Singh Trujillo
• Jaskaran Singh
• Sarabjeet Singh
• Keveonna Singleton, RBT
• Kyle Angelo Cruz Siy
• Sandra Beth Skates, D,O.
• Danielle Slade
• Skylar Marie Slawiak
• Sleepmed of California, Inc.

• Rheumatology Physician in Vacaville, CA
• Providers in Vacaville, CA by specialty
• Rheumatology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 7, 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.