NPI registry status
Active
2026 NPPES data Pharmacotherapy Pharmacist NPI 1891806188 RPH
Verify on CMS → Trent Merkwan, RPH
Pharmacotherapy Pharmacist in Miller, South Dakota.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 5,925 in Pharmacotherapy Pharmacist, 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
17
Medicare Part D claims · 15 beneficiaries · Pharmacotherapy Pharmacist avg: 397
Generic prescribing
0%
generic claims · 100% 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
Trent Merkwan, RPH filed 17 Medicare Part D claims in 2023 as a Pharmacotherapy Pharmacist in Miller, South Dakota, prescribing 0% generic.
- 17
- Part D claims, 2023
- 0%
- 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.
Trent Merkwan, RPH's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
17 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 Trent Merkwan, RPH?
Quality data not reportedPrimary specialty
Pharmacotherapy Pharmacist
Medicare Part D claims
17 96% vs specialty avg
Specialty distribution in South Dakota
How Pharmacotherapy Pharmacist compares to other specialties among South Dakota 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 Pharmacotherapy Pharmacist. 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).
Trent Merkwan, RPH appears in the CMS NPPES registry as a Pharmacotherapy Pharmacist provider holding RPH credentials at 209 N BROADWAY AVE, Miller, SD, 57362, with a listed phone of (605) 853-3647. NPI 1891806188 was issued on 08/31/2006.
Medicare Part D records for calendar year 2023 show 17 prescription claims written by this provider, covering 15 Medicare beneficiaries and totaling roughly $3K in drug spend, split 100% brand-name and 0% generic by claim count.
Pharmacotherapy Pharmacist is a mid-sized specialty nationwide, with 5,925 enrolled providers across 53 states and an average of 397 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 | 1891806188 |
|---|---|
| Specialty | Pharmacotherapy Pharmacist |
| Credentials | RPH |
| Gender | Male |
| NPI Issued | 08/31/2006 |
Brand vs generic prescribing mix · Brand-heavy
Trent Merkwan, RPH - brand share 100.0%
Pharmacotherapy Pharmacist average
100% brand-name claims vs 0% generic, on 17 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.
17
Total Claims
$3K
Total Drug Cost
15
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 17
- Total Day Supply
- 17
- Brand vs Generic
- 100% brand / 0% generic
- Brand Drug Cost
- $3K
- Generic Drug Cost
- $0
Patient Demographics
- Average Patient Age
- 78.1 years
- Avg HCC Risk Score
- 0.84
Pharmacotherapy Pharmacist Overview
How Trent Merkwan, RPH fits within the Pharmacotherapy Pharmacist landscape nationally.
5,925
Pharmacotherapy Pharmacist Providers in US
53
States with Pharmacotherapy Pharmacist
397
Avg Claims per Provider
Trent Merkwan, RPH's 17 claims are below the specialty average of 397.
Nearby Pharmacotherapy Pharmacist Providers in South Dakota
Other clinicians with the same primary specialty enrolled in South Dakota, drawn from the same CMS NPPES roster as Merkwan.
Dr. Travis Anderberg
PHARM. D
Miller, SD
Dr. Stacy Anderson
PHARMD
Aberdeen, SD
Dr. Gordon Budahl
RPH
Fort Meade, SD
Dr. Robert Caldwell
PHARM.D., PH.D.
Rosebud, SD
Dr. William Charles
PHARMD
Pine Ridge, SD
Compare Pharmacotherapy Pharmacist 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 South Dakota medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Pharmacotherapy Pharmacist 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
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How to Find a Doctor
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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 South Dakota
Frequently Asked Questions
What is Trent Merkwan, RPH's specialty? ▼
Trent Merkwan, RPH specializes in Pharmacotherapy Pharmacist and practices in Miller, South Dakota. Credentials: RPH.
How much does Trent Merkwan, RPH prescribe under Medicare Part D? ▼
In 2023, Trent Merkwan, RPH wrote 17 Medicare Part D claims totaling $3K in drug costs for 15 beneficiaries.
Where is Trent Merkwan, RPH located? ▼
Trent Merkwan, RPH is located at 209 N BROADWAY AVE, Miller, SD, 57362. Phone: (605) 853-3647.
What is Trent Merkwan, RPH's NPI number? ▼
Trent Merkwan, RPH's National Provider Identifier (NPI) is 1891806188, issued on 08/31/2006.
Does Trent Merkwan, RPH prescribe more brand-name or generic drugs? ▼
Trent Merkwan, RPH's prescribing is 100% brand-name and 0% generic drugs by claim count, with $3K in brand drug costs.
How many Pharmacotherapy Pharmacist providers are there in the US? ▼
There are 5,925 Pharmacotherapy Pharmacist providers across 53 states in the US. The average Pharmacotherapy Pharmacist provider writes 397 Medicare Part D claims per year.
Does Trent Merkwan, RPH accept Medicare? ▼
Trent Merkwan, RPH appears in CMS Medicare data with 17 Part D claims and 15 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Trent Merkwan, RPH's credentials? ▼
Trent Merkwan, RPH's NPI is 1891806188 with credentials RPH. 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.