Michelle Sit, MD
Rheumatology Physician · Vacaville, CA
Michelle Sit, MD is a rheumatology physician with a practice address in Vacaville, California, and NPI 1740269513, issued on Jan 11, 2006. Check the license (California C-188321, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michelle Sit
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License numbers
- C-188321 CA
0101238150 VA
Self-reported in NPPES; status is on the state search - Practice location
- 1010 Nut Tree RD Ste 100A, Vacaville, CA 95687
- Phone
- (707) 624-8532
- Enumerated
- Jan 11, 2006
- Record last updated
- Jan 7, 2026
- Fax
- (707) 624-8501
- Medicare enrollment
- Enrolled (PECOS I20240521003564); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Verify Michelle Sit in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C-188321Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average rheumatology physician in 2024
96 Medicare Part D claims for 25 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone53 claims
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.
Industry payments in 2024: $735.49
7 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 4,486 providers of this specialty with any payment received $8,538.33 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.
Bills Medicare through 2 group practices
- Northbay Health Medical FoundationVacaville, CA
- Northbay Physicians Surgery Center, LLCVacaville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michelle Sit among 926 rheumatology physician records in California
Michelle Sit, MD is one of 926 rheumatology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2003 · median 2003 among the 641 with a school on file
- Record last updated2026 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in Vacaville → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Melissa Schoenwetter, D.O.Vacaville, CA 956871699844019
- Mark Mansour, M.D.Cameron Park, CA 956821073597241
- Minzi Chen, MDWoodland, CA 956951922269067
- Diana Lau, MDWoodland, CA 956951770506537
- Lei Wang, MDWoodland, CA 956951497173355
- Robinder Dhillon, M.D., M.B.A.Rancho Cordova, CA 956701841557477
- Feruza AbraamyanRoseville, CA 956611124769278
- Emilia Banisad, MDRoseville, CA 956611598293276
Common questions
What is Michelle Sit, MD's NPI number?
Michelle Sit, MD's National Provider Identifier (NPI) is 1740269513, issued on Jan 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michelle Sit, MD located?
The NPPES record lists a practice address at 1010 Nut Tree RD Ste 100A, Vacaville, CA, 95687. Phone: (707) 624-8532. Providers update this record themselves, so call before visiting.
How can I verify Michelle Sit, MD's license?
NPPES lists California license number C-188321, 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 Michelle Sit, MD prescribe under Medicare Part D?
In 2024, Michelle Sit, MD had 96 Medicare Part D claims for 25 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
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.