James Horodyski, M.D.
Internal Medicine Physician · Fairfield, CA
James Horodyski, M.D. is an internal medicine physician with a practice address in Fairfield, California, and NPI 1184710063, issued on Oct 5, 2006. Check the license (California A68731, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Horodyski
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A68731 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 B Gale Wilson Blvd, Fairfield, CA 94533
- Phone
- (707) 429-3600
- Enumerated
- Oct 5, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070427000170); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1200 B Gale Wilson Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James Horodyski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A68731Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
11 Medicare Part D claims, against an average of 3,176 among the 108,855 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 MIPS final score for 2023 (Medicare payment program): 45 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Quantum Healthcare Medical Associates IncVallejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Horodyski among 17,696 internal medicine physician records in California
James Horodyski, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1996 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
54 internal medicine physician records list a practice address in Fairfield
They are 54 of the 3,595 NPPES records with a practice address in Fairfield, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Fairfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sumera Ahmed, MDFairfield, CA 945331134180219
- Nail Amro, M.D.Fairfield, CA 945331861413551
- Shulan Ding, MDFairfield, CA 945331811075351
- Daniel Green, MDFairfield, CA 945331386731602
- Svetlana Gutierrez, M.D.Fairfield, CA 945331619990637
- Jane Hewitt, MDFairfield, CA 945331629156526
- Matthew Johnson, MDFairfield, CA 945331659487395
- Pushkar Pandey, M.D.Fairfield, CA 945331477522480
Common questions
What is James Horodyski, M.D.'s NPI number?
James Horodyski, M.D.'s National Provider Identifier (NPI) is 1184710063, issued on Oct 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James Horodyski, M.D. located?
The NPPES record lists a practice address at 1200 B Gale Wilson Blvd, Fairfield, CA, 94533. Phone: (707) 429-3600. Providers update this record themselves, so call before visiting.
How can I verify James Horodyski, M.D.'s license?
NPPES lists California license number A68731, 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 James Horodyski, M.D. prescribe under Medicare Part D?
In 2024, James Horodyski, M.D. had 11 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is James Horodyski, M.D.'s MIPS final score?
The 2023 MIPS final score is 45 of 100. 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.