DR. MARK THOMAS LARSON (M.D.) – Hospice and Palliative Medicine (Emergency Medicine) Physician, NPI 1497973416
Hospice and Palliative Medicine (Emergency Medicine) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,217 EMERGENCY MEDICINE in WA
Provider Addresses for DR. MARK THOMAS LARSON (M.D.)
6229 SWAYNE DRIVE NE
OLYMPIA, WA 98516
Phone: (360) 438-2865
Fax: (360) 330-8684
Type: Mailing
914 S SCHEUBER RD
CENTRALIA, WA 985319027
Phone: (360) 330-8785
Fax: (360) 330-8784
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $26.
Total Amount is formed as General ($26) + Research ($0) + Ownership ($0) = $26.
Last reported payment date: 2023-06-08 • Largest payer in this snapshot: Inari Medical, Inc. ($26).
Total Amount
$26
General + Research + Ownership
Payments
1
Total payment records
General Amount
$26
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-06-08
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Inari Medical, Inc. | $26 |
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: 2014-04-22
PECOS data refreshed: 2026-06-15
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20031125000084 | I | Emergency Medicine | WA | TBD |
| I20140422001437 | I | Emergency Medicine | TX | 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 |
|---|---|---|---|---|
| 93010 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 188 | 171 | $0 |
| 99285 | Emergency department visit with high level of medical decision making | 137 | 134 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 71 | 68 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 56 | 55 | $0 |
| 99291 | Critical care, first 30-74 minutes | 55 | 55 | $0 |
Insurance plans in this area (ZIP 98516)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Emergency Medicine | TX | |
| Emergency Medicine | WA | |
| Physician Assistant | WA | |
| Emergency Medicine | WA | |
| Emergency Medicine | OH | |
| Emergency Medicine | VA | |
| Physician Assistant | WA | |
| Emergency Medicine | AZ | |
| Emergency Medicine | RI | |
| Emergency Medicine | WA |
Reviews
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