NPI registry status
Active
2026 NPPES data Podiatrist NPI 1548317928 DPM
Verify on CMS → Gregory Zainer, DPM
Podiatrist in Janesville, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,490 in Podiatrist, 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
96
Medicare Part D claims · 47 beneficiaries · Podiatrist avg: 304
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Gregory Zainer, DPM filed 96 Medicare Part D claims in 2023 as a Podiatrist in Janesville, Wisconsin.
- 96
- Part D claims, 2023
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.
Gregory Zainer, DPM's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
96 0th percentile higher than 0% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Gregory Zainer, DPM?
Quality data not reportedPrimary specialty
Podiatrist
Medicare Part D claims
96 68% vs specialty avg
Specialty distribution in Wisconsin
How Podiatrist compares to other specialties among Wisconsin 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 Podiatrist. 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).
Gregory Zainer, DPM appears in the CMS NPPES registry as a Podiatrist provider holding DPM credentials at 1010 N WASHINGTON ST, Janesville, WI, 53548, with a listed phone of (608) 741-6799. NPI 1548317928 was issued on 01/05/2007.
Medicare Part D records for calendar year 2023 show 96 prescription claims written by this provider, covering 47 Medicare beneficiaries and totaling roughly $4K in drug spend.
Podiatrist is a mid-sized specialty nationwide, with 10,490 enrolled providers across 54 states and an average of 304 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1548317928 |
|---|---|
| Specialty | Podiatrist |
| Credentials | DPM |
| Gender | Male |
| NPI Issued | 01/05/2007 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
96
Total Claims
$4K
Total Drug Cost
47
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 177
- Total Day Supply
- 4,771
- Generic Drug Cost
- $4K
Patient Demographics
- Average Patient Age
- 73.7 years
- Avg HCC Risk Score
- 1.37
- Gender Split
- 72% female / 28% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Zainer, DPM prescribes most
Top Medicare Part D drugs by claim count, 2023
- Allopurinol
Allopurinol
20 claims
- Pentoxifylline
Pentoxifylline
12 claims
- Flurbiprofen
Flurbiprofen
11 claims
- Gabapentin
Gabapentin
11 claims
| Drug | Claims |
|---|---|
| Allopurinol | 20 |
| Pentoxifylline | 12 |
| Flurbiprofen | 11 |
| Gabapentin | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Podiatrist Overview
How Gregory Zainer, DPM fits within the Podiatrist landscape nationally.
10,490
Podiatrist Providers in US
54
States with Podiatrist
304
Avg Claims per Provider
Gregory Zainer, DPM's 96 claims are below the specialty average of 304.
Nearby Podiatrist Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Zainer.
Hughes Ackom
La Crosse, WI
Dr. Elizabeth Albanese
D.P.M.
Watertown, WI
Dr. Mark Aldrich
DPM
Antigo, WI
Dr. Dawn Anderson
DPM
Wausau, WI
Dr. Keith Anderson
D.P.M.
Hayward, WI
Compare Podiatrist nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Wisconsin medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Podiatrist peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Wisconsin
Frequently Asked Questions
What is Gregory Zainer, DPM's specialty? ▼
Gregory Zainer, DPM specializes in Podiatrist and practices in Janesville, Wisconsin. Credentials: DPM.
How much does Gregory Zainer, DPM prescribe under Medicare Part D? ▼
In 2023, Gregory Zainer, DPM wrote 96 Medicare Part D claims totaling $4K in drug costs for 47 beneficiaries.
Where is Gregory Zainer, DPM located? ▼
Gregory Zainer, DPM is located at 1010 N WASHINGTON ST, Janesville, WI, 53548. Phone: (608) 741-6799.
What is Gregory Zainer, DPM's NPI number? ▼
Gregory Zainer, DPM's National Provider Identifier (NPI) is 1548317928, issued on 01/05/2007.
How many Podiatrist providers are there in the US? ▼
There are 10,490 Podiatrist providers across 54 states in the US. The average Podiatrist provider writes 304 Medicare Part D claims per year.
What drugs does Gregory Zainer, DPM prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Zainer, DPM's most frequently prescribed drugs include Allopurinol, Pentoxifylline, Flurbiprofen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Zainer, DPM accept Medicare? ▼
Gregory Zainer, DPM appears in CMS Medicare data with 96 Part D claims and 47 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Zainer, DPM's credentials? ▼
Gregory Zainer, DPM's NPI is 1548317928 with credentials DPM. 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 (2023). 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.
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 May 2026.