JAMES CALVIN NIEWENHUIS (M.D.) – Anatomic Pathology & Clinical Pathology Physician, NPI 1356367924
Anatomic Pathology & Clinical Pathology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
573 PATHOLOGY in MI
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Provider Addresses for JAMES CALVIN NIEWENHUIS (M.D.)
5700, Southwyck Boulevard, Southwyck, Toledo, Lucas County, Ohio, 43614, United States
TOLEDO, OH 436141509
Phone: (800) 288-8325
Fax: (419) 866-5453
Type: Mailing
North Ottawa Community Hospital, 1309, Sheldon Road, Grand Haven, Ottawa County, Michigan, 49417, United States
GRAND HAVEN, MI 494172404
Phone: (616) 847-5257
Fax: (419) 866-5453
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.
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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: 2009-02-13
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 |
|---|---|---|---|---|
| I20090213000534 | I | Pathology | 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 |
|---|---|---|---|---|
| 88305 | Pathology examination of tissue using a microscope, intermediate complexity | 321 | 180 | $0 |
| 88307 | Pathology examination of tissue using a microscope, moderately high complexity | 43 | 19 | $0 |
Insurance plans in this area (ZIP 43614)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| P A T H O L O G Y | MI | |
| P A T H O L O G Y | MI | |
| P A T H O L O G Y | MI | |
| P A T H O L O G Y | VT | |
| P A T H O L O G Y | MI | |
| P A T H O L O G Y | MI | |
| P A T H O L O G Y | NY | |
| P A T H O L O G Y | MI | |
| P A T H O L O G Y | MI | |
| P A T H O L O G Y | MI |
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