Mark Grinzinger, DDS, MD
NPI 1376923623 · Oral and Maxillofacial Surgery (Dentist) · Grand Rapids, MI
Mark Grinzinger, DDS, MD is a Oral and Maxillofacial Surgery (Dentist) provider in Grand Rapids, MI (NPI 1376923623).
Provider details
- NPI number
- 1376923623
- Entity type
- Individual
- Primary specialty
- Oral and Maxillofacial Surgery (Dentist)Dental Providers
- Credential
- DDS, MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 2901021497 (MI)
Specialties & taxonomies
Dental Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
11 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin | 107 | 80 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 81 | 72 |
| Chlorhexidine Gluconate | 52 | 44 |
| Clindamycin Hcl | 17 | 15 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$14 across 1 record (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
- 2015-06-02
- Last updated
- 2021-06-21
- Certified
- 2021-06-21
Frequently asked questions
- What is Mark Grinzinger's NPI number?
- Mark Grinzinger's National Provider Identifier (NPI) is 1376923623, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Grinzinger's specialty?
- Mark Grinzinger is listed in the NPPES registry with a primary specialty of Oral and Maxillofacial Surgery (Dentist) (Dental Providers).
- Where is Mark Grinzinger located?
- Mark Grinzinger's practice location on file with NPPES is 4349 Sawkaw Dr Ne, Grand Rapids, MI 49525-1768.
- What is Mark Grinzinger's phone number?
- The practice phone number listed in the NPPES registry for Mark Grinzinger is (586) 576-4140.
- Is Mark Grinzinger's NPI active?
- Yes — Mark Grinzinger's NPI (1376923623) is active in the NPPES registry as of the last update on 2021-06-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.