NPI registry status
Active
2026 NPPES data Oral and Maxillofacial Surgery (Dentist) NPI 1376923623 DDS, MD
Verify on CMS → Mark Grinzinger, DDS, MD
Oral and Maxillofacial Surgery (Dentist) in Grand Rapids, Michigan.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 7,769 in Oral and Maxillofacial Surgery (Dentist), and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
283
Medicare Part D claims · 145 beneficiaries · Oral and Maxillofacial Surgery (Dentist) avg: 407
Industry payments
$13.54
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Mark Grinzinger, DDS, MD filed 283 Medicare Part D claims in 2024 as an Oral and Maxillofacial Surgery (Dentist) in Grand Rapids, Michigan.
- 283
- Part D claims, 2024
- $13.54
- industry payments (Sunshine Act)
- ≥48th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Mark Grinzinger, DDS, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1376923623), first enumerated 06/02/2015.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 283 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Industry payment transparency
$13.54 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
Michigan statewide board action statistics are published annually — these figures describe aggregate state activity, not Mark Grinzinger, DDS, MD's individual license status. Verify directly with the state medical board.
Source: MI-BOM annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1376923623 · Oral and Maxillofacial Surgery (Dentist)
NPI-10 · ENUM-MID · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1376923623
- ENUM-MID 2015
- TAX-MID 8K Oral and
- RX-LIGHT 283
- BOOK-THIN 214 in Michigan
- PHOTO-ENUM Nicholas Nagaki · 2015
Mark Grinzinger, DDS, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
283 ≥ 48th percentile 48% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Mark Grinzinger, DDS, MD?
Quality data not reportedPrimary specialty
Oral and Maxillofacial Surgery (Dentist)
Medicare Part D claims
283 30% vs specialty avg
Specialty distribution in Michigan
How Oral and Maxillofacial Surgery (Dentist) compares to other specialties among Michigan providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Oral and Maxillofacial Surgery (Dentist). Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1376923623 |
|---|---|
| Specialty | Oral and Maxillofacial Surgery (Dentist) |
| Credentials | DDS, MD |
| Gender | Male |
| NPI Issued | 06/02/2015 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Mark Grinzinger, DDS, MD. Source: openpaymentsdata.cms.gov.
Total received
$14
Largest payer
DePuy Synthes Sales Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - Michigan MI-BOM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~41K Michigan medical licensees in 2023 - they are NOT specific to Mark Grinzinger, DDS, MD. To verify Mark Grinzinger, DDS, MD's current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
283
Total Claims
$823
Total Drug Cost
145
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 283.033
- Total Day Supply
- 1,640
- Brand Drug Cost
- $0
- Generic Drug Cost
- $823
- Opioid Claims
- 87 (30.7% rate)
- Antibiotic Claims
- 141
Patient Demographics
- Average Patient Age
- 70.6 years
- Avg HCC Risk Score
- 1.08
- Gender Split
- 46% female / 54% male
- Age Distribution
- <65: 19, 65-74: 75, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Mark Grinzinger, DDS, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Amoxicillin
Amoxicillin
107 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
81 claims
- Chlorhexidine Gluc…
Chlorhexidine Gluconate
52 claims
- Clindamycin Hcl 17
Clindamycin Hcl
17 claims
- Amoxicillin-Clavul… 11
Amoxicillin-Clavulanate Potass
11 claims
| Drug | Claims |
|---|---|
| Amoxicillin | 107 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 81 |
| Chlorhexidine Gluconate | 52 |
| Clindamycin Hcl | 17 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Oral and Maxillofacial Surgery (Dentist) in MI →
All providers in Michigan →
Compare specialties →
Oral and Maxillofacial Surgery (Dentist) Overview
How Mark Grinzinger, DDS, MD fits within the Oral and Maxillofacial Surgery (Dentist) landscape nationally.
7,769
Oral and Maxillofacial Surgery (Dentist) Providers in US
52
States with Oral and Maxillofacial Surgery (Dentist)
407
Avg Claims per Provider
Mark Grinzinger, DDS, MD's 283 claims are below the specialty average of 407.
Nationwide Oral and Maxillofacial Surgery (Dentist) peers with similar MIPS or enrollment year
Two federal-record peer sets for Grinzinger, both outside Michigan so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2015)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Oral and Maxillofacial Surgery (Dentist) Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Grinzinger.
One of 214 Oral and Maxillofacial Surgery (Dentist) providers enrolled in Michigan, 5 are shown here.
Dr. Zaid Abu-Seir
DDS
Warren, MI
Dr. Andrew Afshar
DDS, MD
Midland, MI
Dr. Eyal Akerman
D.M.D, M.SC
Ann Arbor, MI
Dr. Ali Al-Sammak
DMD
Chesterfield, MI
Dr. Ihab Alamat
MD, DDS
Shelby Township, MI
Compare Oral and Maxillofacial Surgery (Dentist) nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mark Grinzinger, DDS, MD's specialty? ▼
Mark Grinzinger, DDS, MD specializes in Oral and Maxillofacial Surgery (Dentist) and practices in Grand Rapids, Michigan. Credentials: DDS, MD.
How much does Mark Grinzinger, DDS, MD prescribe under Medicare Part D? ▼
In 2024, Mark Grinzinger, DDS, MD wrote 283 Medicare Part D claims totaling $823 in drug costs for 145 beneficiaries.
Where is Mark Grinzinger, DDS, MD located? ▼
Mark Grinzinger, DDS, MD is located at 4349 SAWKAW DR NE, Grand Rapids, MI, 49525. Phone: (586) 576-4140.
What is Mark Grinzinger, DDS, MD's NPI number? ▼
Mark Grinzinger, DDS, MD's National Provider Identifier (NPI) is 1376923623, issued on 06/02/2015.
Does Mark Grinzinger, DDS, MD prescribe opioids? ▼
Yes, Mark Grinzinger, DDS, MD had 87 opioid claims in 2024 with an opioid prescribing rate of 30.7%.
How many Oral and Maxillofacial Surgery (Dentist) providers are there in the US? ▼
There are 7,769 Oral and Maxillofacial Surgery (Dentist) providers across 52 states in the US. The average Oral and Maxillofacial Surgery (Dentist) provider writes 407 Medicare Part D claims per year.
What drugs does Mark Grinzinger, DDS, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Mark Grinzinger, DDS, MD's most frequently prescribed drugs include Amoxicillin, Hydrocodone-Acetaminophen, Chlorhexidine Gluconate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Grinzinger, DDS, MD accept Medicare? ▼
Mark Grinzinger, DDS, MD appears in CMS Medicare data with 283 Part D claims and 145 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Grinzinger, DDS, MD's credentials? ▼
Mark Grinzinger, DDS, MD's NPI is 1376923623 with credentials DDS, MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.