James Niewenhuis, M.D.
NPI 1356367924 · Anatomic Pathology & Clinical Pathology Physician · Grand Haven, MI
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Niewenhuis, M.D. is a Anatomic Pathology & Clinical Pathology Physician provider in Grand Haven, MI (NPI 1356367924).
Provider details
- NPI number
- 1356367924
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 4301055088 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
321 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 266 | $34 |
| Pathology Examination of Tissue Using a Microscope, Moderately High Complexity88307 | 44 | $75 |
| Pathology Examination of Tissue Using a Microscope, Moderately Low Complexity88304 | 11 | $11 |
Typical Medicare-allowed amounts for these services range $11–$75 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-15
- Last updated
- 2014-06-16
Frequently asked questions
- What is James Niewenhuis's NPI number?
- James Niewenhuis's National Provider Identifier (NPI) is 1356367924, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Niewenhuis's specialty?
- James Niewenhuis is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is James Niewenhuis located?
- James Niewenhuis's practice location on file with NPPES is 1309 Sheldon Rd, Grand Haven, MI 49417-2404.
- What is James Niewenhuis's phone number?
- The practice phone number listed in the NPPES registry for James Niewenhuis is (616) 847-5257.
- Does James Niewenhuis accept Medicare?
- James Niewenhuis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Niewenhuis's NPI active?
- Yes — James Niewenhuis's NPI (1356367924) is active in the NPPES registry as of the last update on 2014-06-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.