NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1639497621 M.D.
Verify on CMS → Kerry Ahrens, M.D.
Emergency Medicine Physician in Green Bay, 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 64,398 in Emergency Medicine Physician, 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
265
Medicare Part D claims · 161 beneficiaries · Emergency Medicine Physician avg: 352
Industry payments
$99.9
2 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Kerry Ahrens, M.D. filed 265 Medicare Part D claims in 2023 as a Emergency Medicine Physician in Green Bay, Wisconsin.
- 265
- Part D claims, 2023
- Likely
- board-certified (heuristic)
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.
Kerry Ahrens, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
265 49th percentile higher than 49% 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
✓
Board certification likely (heuristic, not verified)
Kerry Ahrens, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 4 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Kerry Ahrens, M.D.?
Quality data not reportedPrimary specialty
Emergency Medicine Physician
Medicare Part D claims
265 25% vs specialty avg
Specialty distribution in Wisconsin
How Emergency Medicine Physician 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 Emergency Medicine Physician. 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).
Kerry Ahrens, M.D. appears in the CMS NPPES registry as a Emergency Medicine Physician provider holding M.D. credentials at 2845 GREENBRIER RD, Green Bay, WI, 54311, with a listed phone of (920) 288-4060. NPI 1639497621 was issued on 05/14/2010.
Medicare Part D records for calendar year 2023 show 265 prescription claims written by this provider, covering 161 Medicare beneficiaries and totaling roughly $3K in drug spend, with an opioid prescribing rate of 6.4%.
Emergency Medicine Physician is a high-volume specialty nationwide, with 64,398 enrolled providers across 56 states and an average of 352 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 | 1639497621 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 05/14/2010 |
Hospital and facility affiliations
Facilities where Kerry Ahrens, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
According to CMS billing records, Kerry Ahrens, M.D. is affiliated with 4 Medicare-billing facilities.
Aurora Health Care North Inc
Two Rivers, WI
Aurora Medical Group, Inc.
Oshkosh, WI
Baycare Aurora LLC
Kaukauna, WI
Baycare Clinic LLP
Green Bay, WI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Kerry Ahrens, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$100
Largest payer
Genentech, Inc.
Most common payment type
Education
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
265
Total Claims
$3K
Total Drug Cost
161
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 271
- Total Day Supply
- 2,847
- Generic Drug Cost
- $3K
- Opioid Claims
- 17 (6.4% rate)
- Antibiotic Claims
- 84
Patient Demographics
- Average Patient Age
- 68.2 years
- Avg HCC Risk Score
- 1.85
- Gender Split
- 63% female / 37% male
- Age Distribution
- <65: 46, 65-74: 62, 75-84: 42, 85+: 11
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Kerry Ahrens, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Cephalexin
Cephalexin
35 claims
- Dexamethasone
Dexamethasone
18 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
16 claims
- Methylprednisolone
Methylprednisolone
16 claims
- Ondansetron Odt
Ondansetron Odt
14 claims
- Prednisone
Prednisone
14 claims
- Cyclobenzaprine Hcl 12
Cyclobenzaprine Hcl
12 claims
- Morphine Sulfate 12
Morphine Sulfate
12 claims
| Drug | Claims |
|---|---|
| Cephalexin | 35 |
| Dexamethasone | 18 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 16 |
| Methylprednisolone | 16 |
| Ondansetron Odt Ondansetron | 14 |
| Prednisone | 14 |
| Cyclobenzaprine Hcl | 12 |
| Morphine Sulfate | 12 |
| Tizanidine Hcl | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Emergency Medicine Physician Overview
How Kerry Ahrens, M.D. fits within the Emergency Medicine Physician landscape nationally.
64,398
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider
Kerry Ahrens, M.D.'s 265 claims are below the specialty average of 352.
Nearby Emergency Medicine Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Ahrens.
Dr. Hythem Abad
DO
Portage, WI
Dr. Alan Abdulla
D.O.
Waukesha, WI
Dr. Krystyna Abdulla
DO
New Berlin, WI
Dr. Abdulmoniem Abdulmoniem
M.D.
Elkhorn, WI
Dr. Justine Abel
DO
Eau Claire, WI
Compare Emergency Medicine Physician 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 Emergency Medicine Physician 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.
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Frequently Asked Questions
What is Kerry Ahrens, M.D.'s specialty? ▼
Kerry Ahrens, M.D. specializes in Emergency Medicine Physician and practices in Green Bay, Wisconsin. Credentials: M.D..
How much does Kerry Ahrens, M.D. prescribe under Medicare Part D? ▼
In 2023, Kerry Ahrens, M.D. wrote 265 Medicare Part D claims totaling $3K in drug costs for 161 beneficiaries.
Where is Kerry Ahrens, M.D. located? ▼
Kerry Ahrens, M.D. is located at 2845 GREENBRIER RD, Green Bay, WI, 54311. Phone: (920) 288-4060.
What is Kerry Ahrens, M.D.'s NPI number? ▼
Kerry Ahrens, M.D.'s National Provider Identifier (NPI) is 1639497621, issued on 05/14/2010.
Does Kerry Ahrens, M.D. prescribe opioids? ▼
Yes, Kerry Ahrens, M.D. had 17 opioid claims in 2023 with an opioid prescribing rate of 6.4%.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 64,398 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
What drugs does Kerry Ahrens, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Kerry Ahrens, M.D.'s most frequently prescribed drugs include Cephalexin, Dexamethasone, Amoxicillin-Clavulanate Potass. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Kerry Ahrens, M.D. accept Medicare? ▼
Kerry Ahrens, M.D. appears in CMS Medicare data with 265 Part D claims and 161 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Kerry Ahrens, M.D.'s credentials? ▼
Kerry Ahrens, M.D.'s NPI is 1639497621 with credentials M.D.. 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.