Mark S. Sullivan, M.D.
Family Medicine Physician · Fairfield, CA
Mark S. Sullivan, M.D. is a family medicine physician with a practice address in Fairfield, California, and NPI 1871673723, issued on Oct 16, 2006. Check the license (California A49206, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark S. Sullivan
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A49206 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1234 Empire St, Fairfield, CA 94533
- Phone
- (707) 426-3911
- Enumerated
- Oct 16, 2006
- Record last updated
- Jul 28, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (707) 436-2511
- Medicaid ID
- 00A492060 CA
- Medicare enrollment
- Enrolled (PECOS I20050128000328); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 1988
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1234 Empire St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marissa AdenRegistered Nurse1437535176
- Colin AmatoMarriage & Family Therapist1790208288
- Yasmina BazaraaProfessional Counselor1790265833
- Destiny BeardenCommunity Health Worker1841904968
- Sarah BiondolilloSocial Worker1659033181
- Frederick Blair, M.D.Obstetrics & Gynecology Physician1386731768
Verify Mark S. Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A49206Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average family medicine physician in 2024
8,354 Medicare Part D claims for 578 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 470 claims were for opioids.
Most prescribed
- Amlodipine Besylate458 claims
- Atorvastatin Calcium442 claims
- Rosuvastatin Calcium247 claims
- Hydrocodone-Acetaminophen225 claims
- Omeprazole206 claims
- Jardiance189 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.
Bills Medicare through one group practice
- Sutter Valley Medical FoundationVallejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark S. Sullivan among 17,133 family medicine physician records in California
Mark S. Sullivan, M.D. is one of 17,133 family medicine 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, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1988 · median 2005 among the 10,652 with a school on file
- Record last updated2015 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
67 family medicine physician records list a practice address in Fairfield
They are 67 of the 3,595 NPPES records with a practice address in Fairfield, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Fairfield → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Rebekah Ayodele, M.D.Fairfield, CA 945331114965258
- Ronald Chapman, MDFairfield, CA 945331629006333
- David Danzeisen, MDFairfield, CA 945331306924295
- Padma Dasari, M DFairfield, CA 945331730261488
- James Firman, M.D.Fairfield, CA 945331134164189
- Craig Gillespie, MDFairfield, CA 945331609885037
- David Gilliam, M.D.Fairfield, CA 945331376526236
- Robert Landgraf, D.O.Fairfield, CA 945331821032970
Common questions
What is Mark S. Sullivan, M.D.'s NPI number?
Mark S. Sullivan, M.D.'s National Provider Identifier (NPI) is 1871673723, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark S. Sullivan, M.D. located?
The NPPES record lists a practice address at 1234 Empire St, Fairfield, CA, 94533. Phone: (707) 426-3911. Providers update this record themselves, so call before visiting.
How can I verify Mark S. Sullivan, M.D.'s license?
NPPES lists California license number A49206, 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 Mark S. Sullivan, M.D. prescribe under Medicare Part D?
In 2024, Mark S. Sullivan, M.D. had 8,354 Medicare Part D claims for 578 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.