DR. MARK W LARSON M.D.
NPI 1194784090
Specialist in Ellensburg, WA
About Dr. Mark W Larson M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK W LARSON M.D. (NPI 1194784090) is an individual specialist in Ellensburg, Washington, licensed in Washington (2520900035733) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Virginia Mason Medical Center, and maintains a secondary practice location in Ellensburg.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Mark W Larson M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Mark Larson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Ellensburg, WA 98926
- Reassigned Medicare billing, Washington enrollment
- 163 clinicians in this Medicare group
Greenwood Village, CO 80111
- Reassigned Medicare billing, Washington enrollment
- 57 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Virginia Mason Medical Center
Acute Care Hospitals · Seattle, WAYakima Valley Memorial
Acute Care Hospitals · Yakima, WAKittitas Valley Community Hospital
Critical Access Hospitals · Ellensburg, WAMedicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 18
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Larson's NPI number?
The NPI number for Mark Larson is 1194784090. It was assigned to this individual provider in the NPPES registry on March 20, 2006.
Where is Mark Larson located?
Mark Larson practices at 716 E Manitoba Ave, Ellensburg, WA 98926. The listed phone number is (509) 925-3151.
What is Mark Larson's specialty?
The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.
Is Mark Larson enrolled in Medicare?
Yes. Mark Larson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Mark Larson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Larson reassigns Medicare benefits to 2 organizations: Kittitas County Public Hospital Dist 1 (Ellensburg, WA) and Rural Physicians Group-Pannu PLLC (Greenwood Village, CO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Larson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Larson accept?
Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Mark Larson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Mark Larson affiliated with any hospitals?
According to CMS data, Mark Larson is affiliated with Virginia Mason Medical Center, Yakima Valley Memorial and Kittitas Valley Community Hospital.
When was this NPI record last updated?
The NPPES record for Mark Larson was last updated on May 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Mark W Larson, M.D. · NPI 1194784090
Specialist provider in Ellensburg, Washington. Individual provider, active in the CMS NPPES registry since March 20, 2006.
## Identity
- **NPI:** 1194784090 (Entity type: Individual)
- **Enumerated:** March 20, 2006
- **Primary specialty:** Specialist · taxonomy 174400000X
- **State license:** 2520900035733 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 716 E MANITOBA AVE, Ellensburg, WA 98926-3842
- **Phone:** (509) 925-3151
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Kittitas County Public Hospital Dist 1 (NPI 1932354909, Ellensburg, WA); Rural Physicians Group-Pannu PLLC (NPI 1861808719, Greenwood Village, CO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Kansas School Of Med, class of 1989
## Record status
- **NPPES last updated:** May 15, 2025
- **Other identifiers:** Medicaid 8219073 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1194784090) · Data from the CMS NPPES public registry.