Gary Thomas Underhill, MD
Family Medicine Physician · Dayton, WA
Gary Thomas Underhill, MD is a family medicine physician with a practice address in Dayton, Washington, and NPI 1851375265, issued on Nov 30, 2005. Check the license (Washington MD00037711, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Gary Thomas Underhill
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- MD00037711 WA
MD0037711 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1012 S 3RD St, Dayton, WA 99328
- Phone
- (509) 382-2531
- Enumerated
- Nov 30, 2005
- Record last updated
- Mar 3, 2025
- Fax
- (509) 382-3205
- Medicaid ID
- 1020580 WA
- Medicare enrollment
- Enrolled (PECOS I20070827000624); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Also registered at 1012 S 3RD St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Antonella Barecante, OTD, OR/LOccupational Therapist1508625054
- Jennifer Burnett, NPNurse Practitioner1104475243
- Kendall Carman-Wagner, LICSWClinical Social Worker1962552844
- Sherena Clements, RNEmergency Clinical Nurse Specialist1093696908
- Melissa Czapka, NP-CNurse Practitioner1376072553
- Kenneth Dyball, PACFamily Medicine Physician1184712739
Verify Gary Thomas Underhill in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00037711Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average family medicine physician in 2024
208 Medicare Part D claims for 116 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 15 claims were for opioids.
Most prescribed
- Prednisone23 claims
- Cephalexin12 claims
- Amoxicillin-Clavulanate Potass11 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 practice group's MIPS final score for 2023 (Medicare payment program): 91.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Columbia County Hospital DistrictDayton, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gary Thomas Underhill among 5,534 family medicine physician records in Washington
Gary Thomas Underhill, MD is one of 5,534 family medicine physician records with a practice address in Washington. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 92% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1996 · median 2009 among the 3,294 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 Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 family medicine physician records list a practice address in Dayton
They are 7 of the 78 NPPES records with a practice address in Dayton, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Dayton → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- April Biggs, MDDayton, WA 993281154328458
- Jonathan Crosier, MDDayten, WA 993281366533481
- Kenneth Dyball, PACDayton, WA 993281184712739
- Laurence Eidt, M.D.Dayton, WA 993281275733560
- Kurt Frauenpreis, MDDayton, WA 993281093732182
- Michael Frommlet, MDDayton, WA 993281528087335
- Michael Luce, M.D.Dayton, WA 993281003904640
- Dale Fetroe, MDConnell, WA 993261124025721
Common questions
What is Gary Thomas Underhill, MD's NPI number?
Gary Thomas Underhill, MD's National Provider Identifier (NPI) is 1851375265, issued on Nov 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Gary Thomas Underhill, MD located?
The NPPES record lists a practice address at 1012 S 3RD St, Dayton, WA, 99328. Phone: (509) 382-2531. Providers update this record themselves, so call before visiting.
How can I verify Gary Thomas Underhill, MD's license?
NPPES lists Washington license number MD00037711, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gary Thomas Underhill, MD prescribe under Medicare Part D?
In 2024, Gary Thomas Underhill, MD had 208 Medicare Part D claims for 116 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Gary Thomas Underhill, MD's MIPS final score?
The 2023 MIPS final score is 91.5 of 100, reported for the practice group. 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.