JOHN W HAMERSMA M.D.
NPI 1033108329
Family Medicine in Wyoming, MI
About John W Hamersma M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN W HAMERSMA M.D. (NPI 1033108329) is an individual family medicine provider in Wyoming, Michigan, licensed in Michigan (4301074575) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, is affiliated with Spectrum Health, and is a graduate of Michigan State University College Of Human Medicine (1999).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
John W Hamersma M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show John Hamersma reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Grand Rapids, MI 49546
- Reassigned Medicare billing, Michigan enrollment
- 18 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 12
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Spectrum Health
Acute Care Hospitals · Grand Rapids, MIMercy Health Saint Mary's
Acute Care Hospitals · Grand Rapids, MIUniversity Of Michigan Health - West
Acute Care Hospitals · Wyoming, MICorewell Health Pennock Hospital
Critical Access Hospitals · Hastings, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 49519 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WYOMING, MI 49519
WYOMING, MI 49519
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Hamersma's NPI number?
The NPI number for John Hamersma is 1033108329. It was assigned to this individual provider in the NPPES registry on October 19, 2005.
Where is John Hamersma located?
John Hamersma practices at 2093 Health Dr SW Ste 200, Wyoming, MI 49519. The listed phone number is (616) 459-3158.
What is John Hamersma's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is John Hamersma enrolled in Medicare?
Yes. John Hamersma is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for John Hamersma's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Hamersma reassigns Medicare benefits to Grand Valley Medical Specialists Plc (Grand Rapids, MI). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Hamersma's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Hamersma accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company and 2 other insurers list John Hamersma as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Hamersma affiliated with any hospitals?
According to CMS data, John Hamersma is affiliated with Spectrum Health, Mercy Health Saint Mary's, University Of Michigan Health - West and Corewell Health Pennock Hospital.
When was this NPI record last updated?
The NPPES record for John Hamersma was last updated on June 21, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# John W Hamersma, M.D. · NPI 1033108329
Family Medicine physician in Wyoming, Michigan. Individual provider, active in the CMS NPPES registry since October 19, 2005.
## Identity
- **NPI:** 1033108329 (Entity type: Individual)
- **Enumerated:** October 19, 2005
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 4301074575 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 2093 HEALTH DR SW, STE 200, Wyoming, MI 49519
- **Phone:** (616) 459-3158 · **Fax:** (616) 819-2222
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Grand Valley Medical Specialists Plc (NPI 1033226402, Grand Rapids, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Michigan State University College Of Human Medicine, class of 1999
## Record status
- **NPPES last updated:** June 21, 2016
- **Other identifiers:** Medicare PIN 0D16122030 (MI); Medicaid 4949420 (MI); Medicare UPIN H61127 (MI)
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Source: [NPI Profile](https://npiprofile.com/npi/1033108329) · Data from the CMS NPPES public registry.