NPI registry status
Active
2026 NPPES data Administrator Registered Nurse NPI 1093965816 DNP
Verify on CMS → Ryan Marendiuk, DNP
Administrator Registered Nurse in Fond Du Lac, 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 2,282 in Administrator Registered Nurse, 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
297
Medicare Part D claims · 66 beneficiaries · Administrator Registered Nurse avg: 796
Generic prescribing
95%
generic claims · 5% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Ryan Marendiuk, DNP filed 297 Medicare Part D claims in 2023 as a Administrator Registered Nurse in Fond Du Lac, Wisconsin, prescribing 95% generic.
- 297
- Part D claims, 2023
- 95%
- generic prescribing
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.
Ryan Marendiuk, DNP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
297 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
What does the federal data show about Ryan Marendiuk, DNP?
Quality data not reportedPrimary specialty
Administrator Registered Nurse
Medicare Part D claims
297 63% vs specialty avg
Specialty distribution in Wisconsin
How Administrator Registered Nurse 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 Administrator Registered Nurse. 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).
Ryan Marendiuk, DNP appears in the CMS NPPES registry as an Administrator Registered Nurse provider holding DNP credentials at 430 E DIVISION ST, Fond Du Lac, WI, 54935, with a listed phone of (920) 926-4200. NPI 1093965816 was issued on 09/29/2008.
Medicare Part D records for calendar year 2023 show 297 prescription claims written by this provider, covering 66 Medicare beneficiaries and totaling roughly $30K in drug spend, split 5% brand-name and 95% generic by claim count.
Administrator Registered Nurse is a narrow specialty nationwide, with 2,282 enrolled providers across 52 states and an average of 796 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 | 1093965816 |
|---|---|
| Specialty | Administrator Registered Nurse |
| Credentials | DNP |
| Gender | Male |
| NPI Issued | 09/29/2008 |
Brand vs generic prescribing mix · Generic-heavy
Ryan Marendiuk, DNP - brand share 5.0%
Administrator Registered Nurse average
5% brand-name claims vs 95% generic, on 297 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
297
Total Claims
$30K
Total Drug Cost
66
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 297
- Total Day Supply
- 5,023
- Brand vs Generic
- 5% brand / 95% generic
- Brand Drug Cost
- $21K
- Generic Drug Cost
- $10K
Patient Demographics
- Average Patient Age
- 46.4 years
- Avg HCC Risk Score
- 1.64
- Gender Split
- 47% female / 53% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ryan Marendiuk, DNP prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydroxyzine Pamoate
Hydroxyzine Pamoate
31 claims
- Quetiapine Fumarate
Quetiapine Fumarate
28 claims
- Clonidine Hcl
Clonidine Hcl
27 claims
- Aripiprazole
Aripiprazole
22 claims
- Olanzapine
Olanzapine
18 claims
- Trazodone Hcl
Trazodone Hcl
16 claims
- Prazosin Hcl
Prazosin Hcl
15 claims
- Fluoxetine Hcl
Fluoxetine Hcl
13 claims
| Drug | Claims |
|---|---|
| Hydroxyzine Pamoate | 31 |
| Quetiapine Fumarate | 28 |
| Clonidine Hcl | 27 |
| Aripiprazole | 22 |
| Olanzapine | 18 |
| Trazodone Hcl | 16 |
| Prazosin Hcl | 15 |
| Fluoxetine Hcl | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Administrator Registered Nurse Overview
How Ryan Marendiuk, DNP fits within the Administrator Registered Nurse landscape nationally.
2,282
Administrator Registered Nurse Providers in US
52
States with Administrator Registered Nurse
796
Avg Claims per Provider
Ryan Marendiuk, DNP's 297 claims are below the specialty average of 796.
Nearby Administrator Registered Nurse Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Marendiuk.
Lindsay Anderson
Onalaska, WI
Dr. Angela Bartkus
RN
Cedarburg, WI
Kathleen Becker
Waukesha, WI
Dr. Elizabeth Gilbert
RN
Waukesha, WI
Dr. Barbara Henry
REGISTERED NURSE
Milwaukee, WI
Compare Administrator Registered Nurse 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 Administrator Registered Nurse 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 Ryan Marendiuk, DNP's specialty? ▼
Ryan Marendiuk, DNP specializes in Administrator Registered Nurse and practices in Fond Du Lac, Wisconsin. Credentials: DNP.
How much does Ryan Marendiuk, DNP prescribe under Medicare Part D? ▼
In 2023, Ryan Marendiuk, DNP wrote 297 Medicare Part D claims totaling $30K in drug costs for 66 beneficiaries.
Where is Ryan Marendiuk, DNP located? ▼
Ryan Marendiuk, DNP is located at 430 E DIVISION ST, Fond Du Lac, WI, 54935. Phone: (920) 926-4200.
What is Ryan Marendiuk, DNP's NPI number? ▼
Ryan Marendiuk, DNP's National Provider Identifier (NPI) is 1093965816, issued on 09/29/2008.
Does Ryan Marendiuk, DNP prescribe more brand-name or generic drugs? ▼
Ryan Marendiuk, DNP's prescribing is 5% brand-name and 95% generic drugs by claim count, with $21K in brand drug costs.
How many Administrator Registered Nurse providers are there in the US? ▼
There are 2,282 Administrator Registered Nurse providers across 52 states in the US. The average Administrator Registered Nurse provider writes 796 Medicare Part D claims per year.
What drugs does Ryan Marendiuk, DNP prescribe most often? ▼
Based on 2023 Medicare Part D data, Ryan Marendiuk, DNP's most frequently prescribed drugs include Hydroxyzine Pamoate, Quetiapine Fumarate, Clonidine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ryan Marendiuk, DNP accept Medicare? ▼
Ryan Marendiuk, DNP appears in CMS Medicare data with 297 Part D claims and 66 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ryan Marendiuk, DNP's credentials? ▼
Ryan Marendiuk, DNP's NPI is 1093965816 with credentials DNP. 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.