John Hamersma, M.D.
NPI 1033108329 · Family Medicine Physician · Wyoming, MI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Hamersma, M.D. is a Family Medicine Physician provider in Wyoming, MI (NPI 1033108329).
Provider details
- NPI number
- 1033108329
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 4301074575 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
831 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 208 | $125 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 147 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 85 | $10 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 78 | $131 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 64 | $13 |
| Colorectal Cancer Screening; Fecal Occult Blood Test, Immunoassay, 1-3 SimultaneousG0328 | 63 | $17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 132 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 627 | 183 |
| Levothyroxine Sodium | 529 | 117 |
| Lisinopril | 424 | 121 |
| Amlodipine Besylate | 339 | 102 |
| Rosuvastatin Calcium | 322 | 93 |
| Omeprazole | 298 | 88 |
| Hydrochlorothiazide |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$40 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-19
- Last updated
- 2016-06-21
Frequently asked questions
- What is John Hamersma's NPI number?
- John Hamersma's National Provider Identifier (NPI) is 1033108329, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Hamersma's specialty?
- John Hamersma is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Hamersma located?
- John Hamersma's practice location on file with NPPES is 2093 Health Dr Sw, Wyoming, MI 49519.
- What is John Hamersma's phone number?
- The practice phone number listed in the NPPES registry for John Hamersma is (616) 459-3158.
- Does John Hamersma accept Medicare?
- John Hamersma is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Hamersma's NPI active?
- Yes — John Hamersma's NPI (1033108329) is active in the NPPES registry as of the last update on 2016-06-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.