DR. MARK W LARSON (M.D.) – Specialist, NPI 1194784090
Specialist
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,141 FAMILY PRACTICE in WA
Provider Addresses for DR. MARK W LARSON (M.D.)
603 S Chestnut St
Ellensburg, WA 989263875
Phone: (303) 390-1940
Type: Location
716, East Manitoba Avenue, Ellensburg, Kittitas County, Washington, 98926, United States
ELLENSBURG, WA 989263842
Phone: (509) 925-3151
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2009-10-07
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20091007000327 | I | Family Practice | WA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 261 | 113 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 163 | 144 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 146 | 135 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 35 | 17 | $0 |
| 99238 | Hospital discharge day management, 30 minutes or less | 17 | 17 | $0 |
Insurance plans in this area (ZIP 98926)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | CO | |
| Pulmonary Disease, Critical Care (Intensivists), Critical Care (Intensivists), Pulmonary Disease, Internal Medicine | WA | |
| Internal Medicine | AZ | |
| Hospitalist, Internal Medicine, Osteopathic Manipulative Medicine | CO | |
| - | CO | |
| Internal Medicine, Critical Care (Intensivists), Pulmonary Disease, Critical Care (Intensivists) | WA | |
| Family Practice | CO | |
| Hospitalist, Internal Medicine, Internal Medicine | ND | |
| Pulmonary Disease, Pulmonary Disease, Internal Medicine | WA | |
| Nurse Practitioner | MI |
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