Larissa Ann Thomas, M.D.
Family Medicine Physician · La Grande, OR
Larissa Ann Thomas, M.D. is a family medicine physician with a practice address in La Grande, Oregon, and NPI 1720344393, issued on Apr 7, 2012. Check the license (Oregon MD168475, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Larissa Ann Thomas
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD168475 OR
Self-reported in NPPES; status is on the state search - Practice location
- 2011 4TH St, La Grande, OR 97850
- Phone
- (541) 963-4139
- Enumerated
- Apr 7, 2012
- Record last updated
- Dec 30, 2025
- Fax
- (541) 429-6612
- Medicare enrollment
- Enrolled (PECOS I20151029002280); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 2012
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,847 in Oregon → Look up another NPI →
Also registered at 2011 4TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Chandler, CHWCommunity Health Worker1184435174
- Jamie Dickenson, LCSWClinical Social Worker1578322251
- Bonnie Dittmann, PA-CPhysician Assistant1114244498
- Dorian EriichCommunity Health Worker1669270575
- Dehanna Gascon, FNP-BCPrimary Care Nurse Practitioner1982575908
- McKenzie HansenFamily Nurse Practitioner1639952930
Verify Larissa Ann Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD168475Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% more Medicare Part D claims than the average family medicine physician in 2024
6,528 Medicare Part D claims for 334 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 291 claims were for opioids.
Most prescribed
- Levothyroxine Sodium336 claims
- Atorvastatin Calcium287 claims
- Lisinopril245 claims
- Omeprazole163 claims
- Gabapentin162 claims
- Losartan Potassium159 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
- Praxis Health PCLa Grande, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Larissa Ann Thomas among 2,847 family medicine physician records in Oregon
Larissa Ann Thomas, M.D. is one of 2,847 family medicine physician records with a practice address in Oregon. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 68% of them.
- NPI issued2012 · 68% of these records are older, 30% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2012 · median 2009 among the 1,671 with a school on file
- Record last updated2025 · 57% 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 Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 family medicine physician records list a practice address in La Grande
They are 12 of the 557 NPPES records with a practice address in La Grande, and 2,847 family medicine physician records in Oregon.
All 2,847 in Oregon → Every provider in La Grande → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Bryan Conklin, MD PCLa Grande, OR 978501346334075
- Brooke Davis, DOLa Grande, OR 978501164839320
- Mary Porter, D.OLa Grande, OR 978501477739720
- John Schaefer, MDLa Grande, OR 978501821182551
- Ellen Schoenfelder, MDLa Grande, OR 978501306912035
- Naghmeh TishmanLa Grande, OR 978501700450251
- Bradley TishmanLa Grande, OR 978501033783584
- Bryan Tolle, D.O.La Grande, OR 978501275878894
Common questions
What is Larissa Ann Thomas, M.D.'s NPI number?
Larissa Ann Thomas, M.D.'s National Provider Identifier (NPI) is 1720344393, issued on Apr 7, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Larissa Ann Thomas, M.D. located?
The NPPES record lists a practice address at 2011 4TH St, La Grande, OR, 97850. Phone: (541) 963-4139. Providers update this record themselves, so call before visiting.
How can I verify Larissa Ann Thomas, M.D.'s license?
NPPES lists Oregon license number MD168475, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Larissa Ann Thomas, M.D. prescribe under Medicare Part D?
In 2024, Larissa Ann Thomas, M.D. had 6,528 Medicare Part D claims for 334 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.