Mark Larson, M.D.
NPI 1194784090 · Specialist · Ellensburg, WA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Larson, M.D. is a Specialist provider in Ellensburg, WA (NPI 1194784090).
Provider details
- NPI number
- 1194784090
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD00035733 (WA)
Specialties & taxonomies
Other Service Providers
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
578 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 221 | $115 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 144 | $168 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 98 | $112 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 62 | $78 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 35 | $77 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 18 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azithromycin | 19 | 15 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 16 | 16 |
| Furosemide | 15 | 14 |
| Prednisone | 13 | — |
| Potassium Chloride | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 603 S Chestnut StEllensburg, WA 98926-3875Phone: (303) 390-1940
Registry dates
- Enumerated
- 2006-03-20
- Last updated
- 2025-05-15
- Certified
- 2025-05-15
Frequently asked questions
- What is Mark Larson's NPI number?
- Mark Larson's National Provider Identifier (NPI) is 1194784090, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Larson's specialty?
- Mark Larson is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Mark Larson located?
- Mark Larson's practice location on file with NPPES is 716 E Manitoba Ave, Ellensburg, WA 98926-3842.
- What is Mark Larson's phone number?
- The practice phone number listed in the NPPES registry for Mark Larson is (509) 925-3151.
- Does Mark Larson accept Medicare?
- Mark Larson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Larson's NPI active?
- Yes — Mark Larson's NPI (1194784090) is active in the NPPES registry as of the last update on 2025-05-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.