NPIMap

Individual provider Active NPI

Cheyenne Cassel Sonntag, MD

  • Surgery Physician
  • Palo Alto, CA
National Provider Identifier
1104244144
Registry record updated Apr 27, 2024
On this page

Key facts

NPPES NPI Registry
Primary specialty
Surgery PhysicianTaxonomy code 208600000X
License
A171743 Issued in CA
Practice address
300 Pasteur Dr
Palo Alto, CA 94305-2200
Phone
(650) 723-4000
NPI assigned
Apr 5, 2014
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Apr 27, 2024

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Surgery Physician 208600000X A171743 CA Primary
Surgical Critical Care Physician 2086S0102X A171743 CA

Addresses

Primary practice location

300 Pasteur Dr
Palo Alto, CA 94305-2200

Mailing address

300 Pasteur Dr
Palo Alto, CA 94305-2200
Phone (650) 723-4000

Other names 1

  • Cassie Sonntag Other name

Medicare participation

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

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20220811001364 CA Practitioner - General SurgeryPractitioner - Other (Physician) 3870716954 Reassigns benefits to 3 organizations

Care Compare profile

Medicare Care Compare
Specialty
General Surgery
Education
University of Southern California Keck School of Medicine, 2014
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Stanford Health CareGroup PAC ID 6709797491, 3,152 clinicians

Practice addresses (Care Compare)

300 Pasteur Dr
Stanford, CA 94305-2200
Phone (650) 723-4000

Hospital & facility affiliations

  • Stanford Health Care Hospital, Stanford, CA, CCN 050441
  • Stanford Health Care Tri-Valley Hospital, Pleasanton, CA, CCN 050283

Merit-based Incentive Payment System (MIPS)

Final score
88.53 of 100Reported as group
Quality
87.08
Promoting interoperability
100
Improvement activities
40
Cost
69.51

Procedures performed for Medicare patients

ProcedureNumber of procedures
Colonoscopy1-10
Hernia repair - groin (open)1-10
Upper gastrointestinal (GI) endoscopy for acid reflux1-10
Removal of tissue12

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
A171743CAMDSurgical Critical Care Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Stanford Health Care Surgery CurrentSince Jun 1, 2023 Accepting new patients
University of California SFGH Medical Group Surgery Current Accepting new patients
LPCH Medical Group Div of Lucile CurrentSince Jun 1, 2023 Accepting new patients
University of California SFGH Medical Group Surgery CurrentSince Apr 28, 2022 Accepting new patients
Stanford Health Care Surgery Current Accepting new patients
University of California SFGH Medical Group CurrentSince Apr 28, 2022 Accepting new patients
Stanford Health Care CurrentSince Jun 1, 2023 Accepting new patients
Stanford Hospital and Clinics Past Accepting new patients
Lucile Salter Packard Children'S Hospital at Stanford Past Accepting new patients

Locations

900 Blake Wilbur Dr
Palo Alto, CA 94304
Phone (650) 498-6004

725 Welch Rd
Palo Alto, CA 94304
Phone (650) 497-8979

5565 W Las Positas Blvd
Ste 260
Pleasanton, CA 94588
Phone (925) 416-5470

1001 Potrero Ave
San Francisco, CA 94110
Phone (415) 206-2305

1001 Potrero Ave
Rm 3A
San Francisco, CA 94110
Phone (415) 206-4632

300 Pasteur Dr
Stanford, CA 94305
Phone (650) 498-5710

Interoperability endpoints

  • Direct secure messaging: csonntag428739@direct.stanfordhealthcare.org
  • Direct secure messaging: csonntag611736@hisp.ehr.sutterhealth.org

Organizations & group practices 9

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.

Hospital & facility affiliations 8

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

NPI Registry JSON

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

{
    "created_epoch": "1396656000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1714176000000",
    "number": "1104244144",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "300 PASTEUR DR",
            "city": "PALO ALTO",
            "state": "CA",
            "postal_code": "943052200",
            "telephone_number": "650-723-4000"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "300 PASTEUR DR",
            "city": "PALO ALTO",
            "state": "CA",
            "postal_code": "943052200",
            "telephone_number": "650-723-4000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SONNTAG",
        "first_name": "CHEYENNE",
        "middle_name": "CASSEL",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2014-04-05",
        "last_updated": "2024-04-27",
        "certification_date": "2024-04-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "CA",
            "license": "A171743",
            "primary": true
        },
        {
            "code": "2086S0102X",
            "taxonomy_group": "",
            "desc": "Surgery, Surgical Critical Care",
            "state": "CA",
            "license": "A171743",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "CASSIE",
            "last_name": "SONNTAG",
            "code": "5",
            "type": "Other Name"
        }
    ]
}

Other providers in Palo Alto, CA

Sources for this page

Verify at the official NPI Registry.