Mark W. Larson, M.D.
Specialist · Ellensburg, WA
Mark W. Larson, M.D. is a specialist with a practice address in Ellensburg, Washington, and NPI 1194784090, issued on Mar 20, 2006. Check the license (Washington 2520900035733, as entered in NPPES) with the Washington board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark W. Larson
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License numbers
- 2520900035733 WA
MD00035733 WA
Self-reported in NPPES; status is on the state search - Practice location
- 716 E Manitoba Ave, Ellensburg, WA 98926
- Phone
- (509) 925-3151
- Enumerated
- Mar 20, 2006
- Record last updated
- May 15, 2025
- Medicaid ID
- 8219073 WA
- Medicare enrollment
- Enrolled (PECOS I20091007000327); accepts Medicare assignment
- Medical or professional school
- University Of Kansas School Of Med (Kc/Wich/Sal), 1989
- Entity
- Type 1 · individual
8 nearest specialist records → All 2,609 in Washington → Look up another NPI →
Also registered at 716 E Manitoba Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marilynn Carr, M.D.Specialist1831168038
- Carissa DahlFamily Medicine Physician1356808596
- Jose Diaz, PA CMedical Physician Assistant1447231790
- Lori Drews, ARNPPsychiatric/Mental Health Nurse Practitioner1922336932
- Bruce Herman, M.D.Specialist1902865900
- Sonja Huebner, ARNPFamily Nurse Practitioner1114259751
Verify Mark W. Larson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Washington board licenses this profession
Search for license 2520900035733Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average specialist in 2024
200 Medicare Part D claims for 87 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D.
Most prescribed
- Azithromycin19 claims
- Amoxicillin-Clavulanate Potass16 claims
- Furosemide15 claims
- Prednisone13 claims
- Potassium Chloride11 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): 77.5 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
- Rural Physicians Group-Pannu PLLCEllensburg, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark W. Larson among 2,609 specialist records in Washington
Mark W. Larson, M.D. is one of 2,609 specialist records with a practice address in Washington. 4% 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 2% of them.
- NPI issued2006 · 2% of these records are older, 83% newer
- In a Medicare fileYes · 4% of these records are
- In the CMS Doctors and Clinicians fileYes · 2% of these records are
- Graduated1989 · median 1990 among the 65 with a school on file
- Record last updated2025 · 92% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 specialist records list a practice address in Ellensburg
They are 19 of the 676 NPPES records with a practice address in Ellensburg, and 2,609 specialist records in Washington.
All 2,609 in Washington → Every provider in Ellensburg → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Ruth Bare, LMPEllensburg, WA 989261225164429
- Mary Call, LMPEllensburg, WA 989261164640256
- Marilynn Carr, M.D.Ellensburg, WA 989261831168038
- James Heppler, M.D.Ellensburg, WA 989261417979568
- Bruce Herman, M.D.Ellensburg, WA 989261902865900
- Daniel Hiersche, M.D.Ellensburg, WA 989261043297187
- John Merrill-Steskal, M.D.Ellensburg, WA 989261700845609
- Timothy O'Brien, MDEllensburg, WA 989261770506453
Common questions
What is Mark W. Larson, M.D.'s NPI number?
Mark W. Larson, M.D.'s National Provider Identifier (NPI) is 1194784090, issued on Mar 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark W. Larson, M.D. located?
The NPPES record lists a practice address at 716 E Manitoba Ave, Ellensburg, WA, 98926. Phone: (509) 925-3151. Providers update this record themselves, so call before visiting.
How can I verify Mark W. Larson, M.D.'s license?
NPPES lists Washington license number 2520900035733, as entered by the provider. Search the Washington board that licenses this profession; the NPPES record confirms identity only.
How much does Mark W. Larson, M.D. prescribe under Medicare Part D?
In 2024, Mark W. Larson, M.D. had 200 Medicare Part D claims for 87 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Mark W. Larson, M.D.'s MIPS final score?
The 2023 MIPS final score is 77.5 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.