KARL J BERTRAM (MD) – Surgery Physician, NPI 1801868047
Surgery Physician
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Profile Insights
NPPES metrics only — not quality of care.
848 GENERAL SURGERY in WI
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Provider Addresses for KARL J BERTRAM (MD)
Fond-du-Lac, Northern Saskatchewan Administration District, Saskatchewan, Canada
FOND DU LAC, WI 549354560
Phone: (920) 926-8340
Fax: (920) 926-8370
Type: Mailing
835, Parkside Street, Ripon, Fond du Lac County, Wisconsin, 54971, United States
RIPON, WI 549718505
Phone: (920) 745-3540
Fax: (920) 745-7932
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: 2010-03-31
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 |
|---|---|---|---|---|
| I20100331000226 | I | General Surgery | WI | 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 |
|---|---|---|---|---|
| 45380 | Biopsy of large bowel using a flexible endoscope | 13 | 13 | $0 |
| 45384 | Removal of polyps or growths of large bowel using a flexible endoscope with electrical cautery | 11 | 11 | $0 |
Insurance plans in this area (ZIP 54935)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Registered Dietitian Or Nutrition Professional | WI | |
| Physical Therapist In Private Practice | MN | |
| Family Practice | WI | |
| Nurse Practitioner | WI | |
| Physician Assistant | WI | |
| Occupational Therapist In Private Practice | WI | |
| Physical Therapist In Private Practice | WI | |
| D E R M A T O L O G Y | WI | |
| P S Y C H I A T R Y | WI | |
| Physical Therapist In Private Practice | WI |
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