NPI registry status
Active
2026 NPPES data Surgical Physician Assistant NPI 1104931500 PA-C, MHS
Verify on CMS → Diana Ruiz, PA-C, MHS
Surgical Physician Assistant 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 16,179 in Surgical Physician Assistant, 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
384
Medicare Part D claims · 181 beneficiaries · Surgical Physician Assistant avg: 316
Generic prescribing
91%
generic claims · 9% 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
Diana Ruiz, PA-C, MHS filed 384 Medicare Part D claims in 2023 as a Surgical Physician Assistant in Portland, Oregon, prescribing 91% generic.
- 384
- Part D claims, 2023
- 91%
- 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.
Diana Ruiz, PA-C, MHS's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
384 Top 43% higher than 57% 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 Diana Ruiz, PA-C, MHS?
Quality data not reportedPrimary specialty
Surgical Physician Assistant
Medicare Part D claims
384 22% vs specialty avg
Specialty distribution in Oregon
How Surgical Physician Assistant 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 Surgical Physician Assistant. 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).
Diana Ruiz, PA-C, MHS appears in the CMS NPPES registry as a Surgical Physician Assistant provider holding PA-C, MHS credentials at 9427 SW BARNES RD, Portland, OR, 97225, with a listed phone of (503) 203-2040. NPI 1104931500 was issued on 08/19/2006.
Medicare Part D records for calendar year 2023 show 384 prescription claims written by this provider, covering 181 Medicare beneficiaries and totaling roughly $14K in drug spend, split 9% brand-name and 91% generic by claim count, with an opioid prescribing rate of 46.9%.
Surgical Physician Assistant is a mid-sized specialty nationwide, with 16,179 enrolled providers across 54 states and an average of 316 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 | 1104931500 |
|---|---|
| Specialty | Surgical Physician Assistant |
| Credentials | PA-C, MHS |
| Gender | Female |
| NPI Issued | 08/19/2006 |
Hospital and facility affiliations
Facilities where Diana Ruiz, PA-C, MHS 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.
Kaiser Foundation Health Plan OF The Northwest
Clackamas, OR
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Generic-heavy
Diana Ruiz, PA-C, MHS - brand share 9.0%
Surgical Physician Assistant average
9% brand-name claims vs 91% generic, on 384 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.
384
Total Claims
$14K
Total Drug Cost
181
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 405
- Total Day Supply
- 6,014
- Brand vs Generic
- 9% brand / 91% generic
- Brand Drug Cost
- $9K
- Generic Drug Cost
- $5K
- Opioid Claims
- 180 (46.9% rate)
- Antibiotic Claims
- 19
Patient Demographics
- Average Patient Age
- 73.8 years
- Avg HCC Risk Score
- 1.10
- Gender Split
- 71% female / 29% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Diana Ruiz, PA-C, MHS prescribes most
Top Medicare Part D drugs by claim count, 2023
- Oxycodone Hcl
Oxycodone Hcl
129 claims
- Ondansetron Odt 40
Ondansetron Odt
40 claims
- Meloxicam 28
Meloxicam
28 claims
- Hydromorphone Hcl 21
Hydromorphone Hcl
21 claims
- Hydrocodone-Acetam… 13
Hydrocodone-Acetaminophen
13 claims
- Tramadol Hcl 12
Tramadol Hcl
12 claims
- Pregabalin 11
Pregabalin
11 claims
- Xarelto 11
Xarelto
11 claims
| Drug | Claims |
|---|---|
| Oxycodone Hcl | 129 |
| Ondansetron Odt Ondansetron | 40 |
| Meloxicam | 28 |
| Hydromorphone Hcl | 21 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 13 |
| Tramadol Hcl | 12 |
| Pregabalin | 11 |
| Xarelto Rivaroxaban | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Surgical Physician Assistant Overview
How Diana Ruiz, PA-C, MHS fits within the Surgical Physician Assistant landscape nationally.
16,179
Surgical Physician Assistant Providers in US
54
States with Surgical Physician Assistant
316
Avg Claims per Provider
Diana Ruiz, PA-C, MHS's 384 claims are above the specialty average of 316.
Nearby Surgical Physician Assistant Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Ruiz.
Evan Acerbo
Hillsboro, OR
Dr. Christine Adams
PA-C
Salem, OR
Dr. Shayne Ahwah
PAC
Beaverton, OR
Dr. Jessica Aikin
PA-C
Hillsboro, OR
Lisa Andersen
Portland, OR
Compare Surgical Physician Assistant 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 Oregon medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Surgical Physician Assistant 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 Diana Ruiz, PA-C, MHS's specialty? ▼
Diana Ruiz, PA-C, MHS specializes in Surgical Physician Assistant and practices in Portland, Oregon. Credentials: PA-C, MHS.
How much does Diana Ruiz, PA-C, MHS prescribe under Medicare Part D? ▼
In 2023, Diana Ruiz, PA-C, MHS wrote 384 Medicare Part D claims totaling $14K in drug costs for 181 beneficiaries.
Where is Diana Ruiz, PA-C, MHS located? ▼
Diana Ruiz, PA-C, MHS is located at 9427 SW BARNES RD, Portland, OR, 97225. Phone: (503) 203-2040.
What is Diana Ruiz, PA-C, MHS's NPI number? ▼
Diana Ruiz, PA-C, MHS's National Provider Identifier (NPI) is 1104931500, issued on 08/19/2006.
Does Diana Ruiz, PA-C, MHS prescribe more brand-name or generic drugs? ▼
Diana Ruiz, PA-C, MHS's prescribing is 9% brand-name and 91% generic drugs by claim count, with $9K in brand drug costs.
Does Diana Ruiz, PA-C, MHS prescribe opioids? ▼
Yes, Diana Ruiz, PA-C, MHS had 180 opioid claims in 2023 with an opioid prescribing rate of 46.9%.
How many Surgical Physician Assistant providers are there in the US? ▼
There are 16,179 Surgical Physician Assistant providers across 54 states in the US. The average Surgical Physician Assistant provider writes 316 Medicare Part D claims per year.
What drugs does Diana Ruiz, PA-C, MHS prescribe most often? ▼
Based on 2023 Medicare Part D data, Diana Ruiz, PA-C, MHS's most frequently prescribed drugs include Oxycodone Hcl, Ondansetron Odt, Meloxicam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Diana Ruiz, PA-C, MHS accept Medicare? ▼
Diana Ruiz, PA-C, MHS appears in CMS Medicare data with 384 Part D claims and 181 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Diana Ruiz, PA-C, MHS's credentials? ▼
Diana Ruiz, PA-C, MHS's NPI is 1104931500 with credentials PA-C, MHS. 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.