LARISSA MICHELE OLSON (PA) – Physician Assistant, NPI 1558839043
Physician Assistant
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,167 PHYSICIAN ASSISTANT in ME
Provider Addresses for LARISSA MICHELE OLSON (PA)
118 Northport Ave
Belfast, ME 049156072
Phone: (585) 943-2282
Type: Location
16 Hospital Rd
Plymouth, NH 032641199
Phone: (603) 536-1120
Type: Location
Unity Hospital, 1555, Long Pond Road, Greece, Monroe, New York, 14626, United States
ROCHESTER, NY 146264122
Phone: (585) 723-7870
Fax: (585) 723-7871
Type: Mailing
115 PORTER DR
MIDDLEBURY, VT 057538629
Phone: (802) 388-8842
Type: Location
420 FRANKLIN ST
RUMFORD, ME 042762104
Phone:
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: 2023-10-30
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 4 Medicare enrollment records; no due dates published yet.
Enrollment records
4
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 |
|---|---|---|---|---|
| I20190610002506 | I | Physician Assistant | NY | TBD |
| I20200826000396 | I | Physician Assistant | VT | TBD |
| I20230217000989 | I | Physician Assistant | NH | TBD |
| I20231030001544 | I | Physician Assistant | ME | 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 |
|---|---|---|---|---|
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 91 | 89 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 30 | 30 | $0 |
Insurance plans in this area (ZIP 04915)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Endocrinology, Internal Medicine | ME | |
| Cardiovascular Disease (Cardiology) | NH | |
| General Surgery | MA | |
| Hospitalist, Internal Medicine | OR | |
| Nurse Practitioner | ME | |
| Hospitalist, Internal Medicine | ME | |
| Medical Oncology | CA | |
| Physician Assistant | ME | |
| Cardiovascular Disease (Cardiology) | ME | |
| Nurse Practitioner | ME |
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