NPI registry status
Active
2026 NPPES data Nurse Practitioner NPI 1558495424 ARNP
Verify on CMS → William Castleberry, ARNP
Nurse Practitioner in Medford, Oregon.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 89,808 in Nurse Practitioner, 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
52
Medicare Part D claims · 27 beneficiaries · Nurse Practitioner avg: 1K
Generic prescribing
79%
generic claims · 21% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
94.3/100
▲ 11 pts above national avg 83.5 · Exceptional
Industry payments
$51.3
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
William Castleberry, ARNP reported a CMS MIPS final score of 94.3/100 - above the 83.5 national average - and filed 52 Medicare Part D claims in 2024.
- 94.3/100
- MIPS score · +11 vs avg
- 52
- Part D claims, 2024
- 79%
- generic prescribing
- $51.3
- industry payments (Sunshine Act)
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 William Castleberry, ARNP
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1558495424), first enumerated 03/15/2007.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 52 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 94.3/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Industry payment transparency
$51.3 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- 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 1558495424 · Nurse Practitioner
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-ELITE · RX-TRACE · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1558495424
- ENUM-MID 2007
- TAX-MEGA 90K Nurse Practitioner
- MIPS-ELITE 94.3/100
- RX-TRACE 52
- BOOK-LIGHT 608 in Oregon
- PHOTO-FINISH Lindsay Cantwell, DN… · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Castleberry · th…
Castleberry · this provider
94.3 MIPS pts
- Taylor Gregory, …
Taylor Gregory, NP
94.3 MIPS pts
- Lindsay Cantwell…
Lindsay Cantwell, DNP, FNP-C
94.3 MIPS pts
- Erika Dell · near
Erika Dell
94.3 MIPS pts
- Ogechi Ebere, AP…
Ogechi Ebere, APRN FNP-C, PMHNP-BC
94.3 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
William Castleberry, ARNP's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
94 ≥ 73rd percentile 73% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where William Castleberry, ARNP sits
This provider among nurse practitioner peers
Across the 13,205 nurse practitioner providers who report both Medicare Part D prescribing and a MIPS quality score, William Castleberry, ARNP writes more Part D claims than 12% of them and scores higher on MIPS quality than 74% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one nurse practitioner peer from a representative sample of 60; the gold marker is William Castleberry, ARNP. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about William Castleberry, ARNP?
High performer (top quartile)Primary specialty
Nurse Practitioner
Medicare Part D claims
52 95% vs specialty avg
MIPS final score
94.3/100 10.8 pts vs avg
Specialty distribution in Oregon
How Nurse Practitioner compares to other specialties among Oregon providers
Medicare quality performance, MIPS
William Castleberry, ARNP's 2023 MIPS final score plotted against the Nurse Practitioner national average
- MIPS Final Score
- 94.3/100
- vs 83.5 national avg · 2023 performance year
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 | 1558495424 |
|---|---|
| Specialty | Nurse Practitioner |
| Credentials | ARNP |
| Gender | Male |
| NPI Issued | 03/15/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
94.3056
Final Score
Measured-score avg: 83.5
85.5889
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
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 William Castleberry, ARNP. Source: openpaymentsdata.cms.gov.
Total received
$51
Largest payer
Boston Scientific Corporation
Most common payment type
Food and Beverage
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.
Brand vs generic prescribing mix · Typical
William Castleberry, ARNP - brand share 21.0%
Nurse Practitioner average
21% brand-name claims vs 79% generic, on 52 2024 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 2024.
52
Total Claims
$4K
Total Drug Cost
27
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 58
- Total Day Supply
- 1,131
- Brand vs Generic
- 21% brand / 79% generic
- Brand Drug Cost
- $4K
- Generic Drug Cost
- $386
- Antibiotic Claims
- 11
Patient Demographics
- Average Patient Age
- 72.3 years
- Avg HCC Risk Score
- 1.14
- Gender Split
- 52% female / 48% male
Nurse Practitioner Overview
How William Castleberry, ARNP fits within the Nurse Practitioner landscape nationally.
89,808
Nurse Practitioner Providers in US
56
States with Nurse Practitioner
1,144
Avg Claims per Provider
William Castleberry, ARNP's 52 claims are below the specialty average of 1,144.
Nationwide Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for Castleberry, both outside Oregon so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (94.3 here).
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Nurse Practitioner Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Castleberry.
One of 608 Nurse Practitioner providers enrolled in Oregon, 5 are shown here.
Maryan Abdulkadir
Portland, OR
Anna Acree
FNP-C
Portland, OR
Stacey Agee
ANP
Astoria, OR
Becky Ahmed
NP-C
Hillsboro, OR
Christopher Aichele
ARNP
Portland, OR
Compare Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is William Castleberry, ARNP's specialty? ▼
William Castleberry, ARNP specializes in Nurse Practitioner and practices in Medford, Oregon. Credentials: ARNP.
How much does William Castleberry, ARNP prescribe under Medicare Part D? ▼
In 2024, William Castleberry, ARNP wrote 52 Medicare Part D claims totaling $4K in drug costs for 27 beneficiaries.
What is William Castleberry, ARNP's Medicare quality score? ▼
William Castleberry, ARNP has a CMS MIPS Final Score of 94.3/100 (Quality: 85.6). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is William Castleberry, ARNP located? ▼
William Castleberry, ARNP is located at 1411 E MCANDREWS RD, Medford, OR, 97504. Phone: (541) 773-1435.
What is William Castleberry, ARNP's NPI number? ▼
William Castleberry, ARNP's National Provider Identifier (NPI) is 1558495424, issued on 03/15/2007.
Does William Castleberry, ARNP prescribe more brand-name or generic drugs? ▼
William Castleberry, ARNP's prescribing is 21% brand-name and 79% generic drugs by claim count, with $4K in brand drug costs.
How many Nurse Practitioner providers are there in the US? ▼
There are 89,808 Nurse Practitioner providers across 56 states in the US. The average Nurse Practitioner provider writes 1,144 Medicare Part D claims per year.
Does William Castleberry, ARNP accept Medicare? ▼
William Castleberry, ARNP appears in CMS Medicare data with 52 Part D claims and 27 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Castleberry, ARNP's credentials? ▼
William Castleberry, ARNP's NPI is 1558495424 with credentials ARNP. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.