Jason L. Umphress, M.D.
Gastroenterology Physician · Woodland, CA
Jason L. Umphress, M.D. is a gastroenterology physician with a practice address in Woodland, California, and NPI 1194741595, issued on Jul 15, 2006. Check the license (California A64129, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jason L. Umphress
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A64129 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1321 Cottonwood St, Woodland, CA 95695
- Phone
- (530) 666-1631
- Enumerated
- Jul 15, 2006
- Record last updated
- Oct 30, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050429000716); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 1321 Cottonwood St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Robert Craven, M.D.Urology Physician1528098100
- Dominic Erba, M.D.Surgery Physician1356367759
- Cathy Jang, MDObstetrics & Gynecology Physician1750306718
Verify Jason L. Umphress in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A64129Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% more Medicare Part D claims than the average gastroenterology physician in 2024
1,144 Medicare Part D claims for 536 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Gavilyte-G185 claims
- Omeprazole110 claims
- Peg-3350 And Electrolytes85 claims
- Famotidine70 claims
- Dicyclomine Hcl55 claims
- Peg 3350-Electrolyte46 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.
The MIPS final score for 2023 (Medicare payment program): 96.5 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
- Dignity Health Medical FoundationWoodland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jason L. Umphress among 2,140 gastroenterology physician records in California
Jason L. Umphress, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1995 · median 2002 among the 1,538 with a school on file
- Record last updated2013 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Woodland → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Brant Lutsi, M.D.Woodland, CA 956951265608186
- Henry Mok, M.D.Woodland, CA 956951710903125
- Lorenzo Rossaro, MDWoodland, CA 956951750368163
- Rafiq Sheikh, MDWoodland, CA 956951699853325
- Lanchinh Nguyen, MDVacaville, CA 956881487732921
- Wai Kan Chiu, M.D., PH.D.Cameron Park, CA 956821801258686
- Matthew Cole, M.D., M.P.H.Cameron Park, CA 956821851450522
- Russell Jacoby, MDCameron Park, CA 956821700852878
Common questions
What is Jason L. Umphress, M.D.'s NPI number?
Jason L. Umphress, M.D.'s National Provider Identifier (NPI) is 1194741595, issued on Jul 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jason L. Umphress, M.D. located?
The NPPES record lists a practice address at 1321 Cottonwood St, Woodland, CA, 95695. Phone: (530) 666-1631. Providers update this record themselves, so call before visiting.
How can I verify Jason L. Umphress, M.D.'s license?
NPPES lists California license number A64129, 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 Jason L. Umphress, M.D. prescribe under Medicare Part D?
In 2024, Jason L. Umphress, M.D. had 1,144 Medicare Part D claims for 536 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Jason L. Umphress, M.D.'s MIPS final score?
The 2023 MIPS final score is 96.5 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.