NPI registry status
Active
2026 NPPES data General Practice Dentistry NPI 1639217102 D.D.S.
Verify on CMS → John Greiner, D.D.S.
General Practice Dentistry in Des Moines, Iowa.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 123,581 in General Practice Dentistry, 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
228
Medicare Part D claims · 113 beneficiaries · General Practice Dentistry avg: 84
What the federal data shows
John Greiner, D.D.S. filed 228 Medicare Part D claims in 2024 as a General Practice Dentistry in Des Moines, Iowa.
- 228
- Part D claims, 2024
- ≥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 John Greiner, D.D.S.
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1639217102), first enumerated 02/04/2007.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 228 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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 1639217102 · General Practice Dentistry
NPI-10 · ENUM-MID · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1639217102
- ENUM-MID 2007
- TAX-MEGA 124K General Practice
- RX-LIGHT 228
- BOOK-LIGHT 1,231 in Iowa
- PHOTO-ENUM Sandra Deklich, DDS · 2007
John Greiner, D.D.S.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
228 ≥ 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 John Greiner, D.D.S.?
Quality data not reportedPrimary specialty
General Practice Dentistry
Medicare Part D claims
228 171% vs specialty avg
Specialty distribution in Iowa
How General Practice Dentistry compares to other specialties among Iowa 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 General Practice Dentistry. 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 | 1639217102 |
|---|---|
| Specialty | General Practice Dentistry |
| Credentials | D.D.S. |
| Gender | Male |
| NPI Issued | 02/04/2007 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
228
Total Claims
$788
Total Drug Cost
113
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 228
- Total Day Supply
- 1,672
- Generic Drug Cost
- $764
- Antibiotic Claims
- 182
Patient Demographics
- Average Patient Age
- 75.5 years
- Avg HCC Risk Score
- 0.98
- Gender Split
- 51% female / 49% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What John Greiner, D.D.S. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Amoxicillin
Amoxicillin
123 claims
- Chlorhexidine Gluc… 37
Chlorhexidine Gluconate
37 claims
- Cephalexin 30
Cephalexin
30 claims
- Clindamycin Hcl 22
Clindamycin Hcl
22 claims
| Drug | Claims |
|---|---|
| Amoxicillin | 123 |
| Chlorhexidine Gluconate | 37 |
| Cephalexin | 30 |
| Clindamycin Hcl | 22 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
General Practice Dentistry Overview
How John Greiner, D.D.S. fits within the General Practice Dentistry landscape nationally.
123,581
General Practice Dentistry Providers in US
56
States with General Practice Dentistry
84
Avg Claims per Provider
John Greiner, D.D.S.'s 228 claims are above the specialty average of 84.
Nationwide General Practice Dentistry peers with similar MIPS or enrollment year
Two federal-record peer sets for Greiner, both outside Iowa so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby General Practice Dentistry Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Greiner.
One of 1,231 General Practice Dentistry providers enrolled in Iowa, 5 are shown here.
Dr. Deborah Adamec
D.D.S.
Iowa City, IA
Dr. Ken Addink
DDS
Sioux Center, IA
Dr. Eric Adler
DDS
Solon, IA
Martin Ahrens
Manning, IA
Dr. Vinti Ahuja
DMD
Bettendorf, IA
Compare General Practice Dentistry nationally: see state-by-state distribution →
Frequently Asked Questions
What is John Greiner, D.D.S.'s specialty? ▼
John Greiner, D.D.S. specializes in General Practice Dentistry and practices in Des Moines, Iowa. Credentials: D.D.S..
How much does John Greiner, D.D.S. prescribe under Medicare Part D? ▼
In 2024, John Greiner, D.D.S. wrote 228 Medicare Part D claims totaling $788 in drug costs for 113 beneficiaries.
Where is John Greiner, D.D.S. located? ▼
John Greiner, D.D.S. is located at 4214 FLEUR DR, Des Moines, IA, 50321. Phone: (515) 285-1694.
What is John Greiner, D.D.S.'s NPI number? ▼
John Greiner, D.D.S.'s National Provider Identifier (NPI) is 1639217102, issued on 02/04/2007.
How many General Practice Dentistry providers are there in the US? ▼
There are 123,581 General Practice Dentistry providers across 56 states in the US. The average General Practice Dentistry provider writes 84 Medicare Part D claims per year.
What drugs does John Greiner, D.D.S. prescribe most often? ▼
Based on 2024 Medicare Part D data, John Greiner, D.D.S.'s most frequently prescribed drugs include Amoxicillin, Chlorhexidine Gluconate, Cephalexin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Greiner, D.D.S. accept Medicare? ▼
John Greiner, D.D.S. appears in CMS Medicare data with 228 Part D claims and 113 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Greiner, D.D.S.'s credentials? ▼
John Greiner, D.D.S.'s NPI is 1639217102 with credentials D.D.S.. 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.