DR. MARK W. COLLAR (M.D.) – Anesthesiology Physician, NPI 1659354553
Anesthesiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,266 ANESTHESIOLOGY in WI
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Provider Addresses for DR. MARK W. COLLAR (M.D.)
Monroe Clinic Hospital, 515, 22nd Avenue, Monroe, Green County, Wisconsin, 53566, United States
MONROE, WI 535661569
Phone: (715) 361-2000
Mailing address matches the actual address.
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: 2023-08-15
PECOS data refreshed: 2026-05-27
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 |
|---|---|---|---|---|
| I20040519000697 | I | Anesthesiology | WI | TBD |
| I20230815003117 | I | Anesthesiology | MI | 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 | 18 | 18 | $0 |
| 00812 | Anesthesia for exam of colon using an endoscope | 18 | 18 | $0 |
| 00731 | Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope | 16 | 16 | $0 |
Insurance plans in this area (ZIP 53566)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| ANESTHESIOLOGY | WI | 00142 | Anesthesia for lens surgery | 15 | 15 |
| ANESTHESIOLOGY | WI | 00790 | Anesthesia for procedure in upper abdomen including use of an endoscope | 13 | 13 |
| ANESTHESIOLOGY | WI | 01402 | Anesthesia for open or endoscopic total knee joint replacement | 33 | 33 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Certified Registered Nurse Anesthetist (Crna) | MI | |
| A N E S T H E S I O L O G Y | CO | |
| Certified Registered Nurse Anesthetist (Crna) | MI | |
| Certified Registered Nurse Anesthetist (Crna) | MN | |
| Certified Registered Nurse Anesthetist (Crna) | MI | |
| Certified Registered Nurse Anesthetist (Crna) | MI | |
| Certified Registered Nurse Anesthetist (Crna) | TN | |
| Certified Registered Nurse Anesthetist (Crna) | MI | |
| Certified Registered Nurse Anesthetist (Crna) | MI | |
| Certified Registered Nurse Anesthetist (Crna) | OK |
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