Cheyenne Cassel Sonntag, MD
Surgery Physician · Palo Alto, CA
Cheyenne Cassel Sonntag, MD is a surgery physician with a practice address in Palo Alto, California, and NPI 1104244144, issued on Apr 5, 2014. Check the license (California A171743, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cheyenne Cassel Sonntag
- Credential
- MD
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- A171743 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Palo Alto, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Apr 5, 2014
- Record last updated
- Apr 27, 2024
- Medicare enrollment
- Enrolled (PECOS I20220811001364); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 3,118 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Deyaaldeen Abu Reesh, MDNeurological Surgery Physician1073201521
- Jose Acosta, MDEmergency Medicine Physician1104454446
- Tracie Adamson, NPNurse Practitioner1982765145
- Aderinsola Aderonmu, MSStudent in an Organized Health Care Education/Training Program1083301196
- Akuvi Claude Adossou, MDStudent in an Organized Health Care Education/Training Program1093394504
- Reena Agrawal, MDPhysical Medicine & Rehabilitation Physician1720257520
Verify Cheyenne Cassel Sonntag in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A171743Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average surgery physician in 2024
12 Medicare Part D claims, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $7.22
1 payment: education; the largest payer was Btg International, Inc. The 17,103 providers of this specialty with any payment received $3,513.80 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Cheyenne Cassel Sonntag among 3,118 surgery physician records in California
Cheyenne Cassel Sonntag, MD is one of 3,118 surgery physician records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 78% of them.
- NPI issued2014 · 78% of these records are older, 20% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2014 · median 2003 among the 1,901 with a school on file
- Record last updated2024 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in California
There are 3,118 surgery physician records in California.
All 3,118 in California → Every provider in Palo Alto → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Mona Beaunoyer, MDStanford, CA 943051750314506
- Stephan Busque, MDStanford, CA 943051508891052
- Waldo Concepcion, MDStanford, CA 943051770518870
- Myriam Curet, M.D.Stanford, CA 943051912093550
- Jaime Dutton, MDStanford, CA 943051861611725
- Abigail Hoffman, MDStanford, CA 943051336391929
- Stefanie Jeffrey, MDStanford, CA 943051326174285
- Byrne Lee, MDPalo Alto, CA 943051134137110
Common questions
What is Cheyenne Cassel Sonntag, MD's NPI number?
Cheyenne Cassel Sonntag, MD's National Provider Identifier (NPI) is 1104244144, issued on Apr 5, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Cheyenne Cassel Sonntag, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Palo Alto, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Cheyenne Cassel Sonntag, MD's license?
NPPES lists California license number A171743, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cheyenne Cassel Sonntag, MD prescribe under Medicare Part D?
In 2024, Cheyenne Cassel Sonntag, MD had 12 Medicare Part D claims; the average among surgery physician prescribers was 147. Part D covers Medicare prescriptions only.
What is Cheyenne Cassel Sonntag, MD's MIPS final score?
The 2023 MIPS final score is 76.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.