NPI registry status
Active
2026 NPPES data Adult Health Nurse Practitioner NPI 1740446335 NP
Verify on CMS → Charles Williamson, NP
Adult Health Nurse Practitioner in Portland, 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 29,519 in Adult Health 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
54
Medicare Part D claims · 14 beneficiaries · Adult Health Nurse Practitioner avg: 1K
Industry payments
$374.41
9 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Charles Williamson, NP filed 54 Medicare Part D claims in 2023 as an Adult Health Nurse Practitioner in Portland, Oregon.
- 54
- Part D claims, 2023
- $374.41
- industry payments (Sunshine Act)
- ≥0th
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1740446335 · Adult Health Nurse Practitioner
NPI-10 · ENUM-MID · TAX-MID · RX-TRACE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1740446335
- ENUM-MID 2008
- TAX-MID 30K Adult Health
- RX-TRACE 54
- BOOK-THIN 301 in Oregon
- PHOTO-ENUM Renee Bohnart · 2008
Charles Williamson, NP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
54 ≥ 0th percentile 0% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Charles Williamson, NP?
Quality data not reportedPrimary specialty
Adult Health Nurse Practitioner
Medicare Part D claims
54 96% vs specialty avg
Specialty distribution in Oregon
How Adult Health Nurse Practitioner compares to other specialties among Oregon 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 Adult Health Nurse Practitioner. 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).
Practice Address
Provider Details
| NPI | 1740446335 |
|---|---|
| Specialty | Adult Health Nurse Practitioner |
| Credentials | NP |
| Gender | Male |
| NPI Issued | 08/02/2008 |
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 Charles Williamson, NP. Source: openpaymentsdata.cms.gov.
Total received
$374
Largest payer
Braeburn Inc.
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
54
Total Claims
$4K
Total Drug Cost
14
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 54
- Total Day Supply
- 563
- Generic Drug Cost
- $4K
Patient Demographics
- Average Patient Age
- 45.9 years
- Avg HCC Risk Score
- 1.69
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 29 |
| Naloxone Hcl | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Adult Health Nurse Practitioner Overview
How Charles Williamson, NP fits within the Adult Health Nurse Practitioner landscape nationally.
29,519
Adult Health Nurse Practitioner Providers in US
55
States with Adult Health Nurse Practitioner
1,201
Avg Claims per Provider
Charles Williamson, NP's 54 claims are below the specialty average of 1,201.
Nationwide Adult Health Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for Williamson, both outside Oregon so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2008)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Adult Health Nurse Practitioner Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Williamson.
One of 301 Adult Health Nurse Practitioner providers enrolled in Oregon, 5 are shown here.
Dr. Lakshi Aldredge
NP
Portland, OR
Dr. Eden Aldrich
FNP
Bend, OR
Dr. Nancy Allison
ANP
Portland, OR
Dr. Stephen Allred
NP
Portland, OR
Dr. Mary Lou Alonso
NP1578815783
Cave Junction, OR
Compare Adult Health Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is Charles Williamson, NP's specialty? ▼
Charles Williamson, NP specializes in Adult Health Nurse Practitioner and practices in Portland, Oregon. Credentials: NP.
How much does Charles Williamson, NP prescribe under Medicare Part D? ▼
In 2023, Charles Williamson, NP wrote 54 Medicare Part D claims totaling $4K in drug costs for 14 beneficiaries.
Where is Charles Williamson, NP located? ▼
Charles Williamson, NP is located at 2119 NE HALSEY ST, Portland, OR, 97232. Phone: (503) 975-9398.
What is Charles Williamson, NP's NPI number? ▼
Charles Williamson, NP's National Provider Identifier (NPI) is 1740446335, issued on 08/02/2008.
How many Adult Health Nurse Practitioner providers are there in the US? ▼
There are 29,519 Adult Health Nurse Practitioner providers across 55 states in the US. The average Adult Health Nurse Practitioner provider writes 1,201 Medicare Part D claims per year.
What drugs does Charles Williamson, NP prescribe most often? ▼
Based on 2023 Medicare Part D data, Charles Williamson, NP's most frequently prescribed drugs include Buprenorphine-Naloxone, Naloxone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Charles Williamson, NP accept Medicare? ▼
Charles Williamson, NP appears in CMS Medicare data with 54 Part D claims and 14 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Charles Williamson, NP's credentials? ▼
Charles Williamson, NP's NPI is 1740446335 with credentials NP. 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
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.