Jennifer Sugay Dionisio, DO
Family Medicine Physician · Fairfield, CA
Jennifer Sugay Dionisio, DO is a family medicine physician with a practice address in Fairfield, California, and NPI 1235877150, issued on May 20, 2022. Check the license (California 20A21920, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jennifer Sugay Dionisio
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A21920 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1550 Gateway Blvd, Fairfield, CA 94533
- Phone
- (707) 427-4000
- Enumerated
- May 20, 2022
- Record last updated
- Sep 9, 2025
- Medicare enrollment
- Enrolled (PECOS I20250909001441); accepts Medicare assignment
- Medical or professional school
- Touro Un College Of Osteopathic Medicine, Vallejo, 2022
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1550 Gateway Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jennifer Sugay Dionisio in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A21920Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average family medicine physician in 2024
527 Medicare Part D claims for 66 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium80 claims
- Losartan Potassium38 claims
- Amlodipine Besylate28 claims
- Furosemide28 claims
- Allopurinol21 claims
- Tamsulosin Hcl21 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
- Permanente Medical Group IncFairfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jennifer Sugay Dionisio among 17,133 family medicine physician records in California
Jennifer Sugay Dionisio, DO 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 2022, is newer than 94% of them.
- NPI issued2022 · 94% of these records are older, 3% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2022 · median 2005 among the 10,652 with a school on file
- Record last updated2025 · 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 Jennifer Sugay Dionisio, DO's NPI number?
Jennifer Sugay Dionisio, DO's National Provider Identifier (NPI) is 1235877150, issued on May 20, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Jennifer Sugay Dionisio, DO located?
The NPPES record lists a practice address at 1550 Gateway Blvd, Fairfield, CA, 94533. Phone: (707) 427-4000. Providers update this record themselves, so call before visiting.
How can I verify Jennifer Sugay Dionisio, DO's license?
NPPES lists California license number 20A21920, 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 Jennifer Sugay Dionisio, DO prescribe under Medicare Part D?
In 2024, Jennifer Sugay Dionisio, DO had 527 Medicare Part D claims for 66 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.