MR. NATHAN S LARSON (CRNA) – Certified Registered Nurse Anesthetist, NPI 1255683777
Certified Registered Nurse Anesthetist
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,775 CERTIFIED REGISTERED NURSE ANESTHETIST (CRNA) in MO
Provider Addresses for MR. NATHAN S LARSON (CRNA)
PO BOX 505164
SAINT LOUIS, MO 631505164
Phone: (417) 829-4620
Fax: (417) 829-4316
Type: Mailing
100 HOSPITAL DR
LEBANON, MO 655369210
Phone: (417) 533-6100
Fax: (417) 533-6021
Type: Location
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: 2017-09-12
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 |
|---|---|---|---|---|
| I20170912002794 | I | Certified Registered Nurse Anesthetist (Crna) | IL | 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 |
|---|---|---|---|---|
| 00811 | Anesthesia for other procedure on large bowel using an endoscope | 19 | 19 | $0 |
| 00731 | Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope | 18 | 18 | $0 |
| 00812 | Anesthesia for exam of colon using an endoscope | 17 | 17 | $0 |
| 00813 | Anesthesia for procedure on small and large bowel using an endoscope | 16 | 16 | $0 |
Insurance plans in this area (ZIP 63150)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| CERTIFIED REGISTERED NURSE ANESTHET | MO | 00142 | Anesthesia for lens surgery | 33 | 33 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Cardiovascular Disease (Cardiology), Internal Medicine | IL | |
| Diagnostic Radiology | FL | |
| Certified Registered Nurse Anesthetist (Crna) | IL | |
| Diagnostic Radiology | PA | |
| Cardiac Electrophysiology, Cardiovascular Disease (Cardiology) | MO | |
| - | IN | |
| - | IL | |
| A N E S T H E S I O L O G Y | IL | |
| Mental Health Counselor | IL | |
| Internal Medicine | IL |
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