NPI registry status
Active
2026 NPPES data Student in an Organized Health Care Education/Training Program NPI 1952043374 MD
Verify on CMS → Riannon Atwater, MD
Student in an Organized Health Care Education/Training Program 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 331,274 in Student in an Organized Health Care Education/Training Program, 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
476
Medicare Part D claims · 70 beneficiaries · Student in an Organized Health Care Education/Training Program avg: 459
What the federal data shows
Riannon Atwater, MD filed 476 Medicare Part D claims in 2023 as a Student in an Organized Health Care Education/Training Program in Portland, Oregon.
- 476
- Part D claims, 2023
- ≥62nd
- 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.
Federal trust snapshot
What official records show about Riannon Atwater, MD
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1952043374), first enumerated 04/07/2022.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 476 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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 1952043374 · Student in an Organized Health Care Education/Training Program
NPI-10 · ENUM-RECENT · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1952043374
- ENUM-RECENT 2022
- TAX-MEGA 331K Student in
- RX-LIGHT 476
- BOOK-LIGHT 4,110 in Oregon
- PHOTO-ENUM Kapil Chandora · 2022
Riannon Atwater, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
476 ≥ 62nd percentile 62% 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 Riannon Atwater, MD?
Quality data not reportedPrimary specialty
Student in an Organized Health Care Education/Training Program
Medicare Part D claims
476 4% vs specialty avg
Specialty distribution in Oregon
How Student in an Organized Health Care Education/Training Program 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 Student in an Organized Health Care Education/Training Program. 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 | 1952043374 |
|---|---|
| Specialty | Student in an Organized Health Care Education/Training Program |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 04/07/2022 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
476
Total Claims
$29K
Total Drug Cost
70
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 821
- Total Day Supply
- 23,150
- Generic Drug Cost
- $9K
Patient Demographics
- Average Patient Age
- 72.6 years
- Avg HCC Risk Score
- 1.71
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 13, 65-74: 25, 75-84: 19, 85+: 13
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Riannon Atwater, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
40 claims
- Metoprolol Succinate
Metoprolol Succinate
21 claims
- Lisinopril
Lisinopril
16 claims
- Levothyroxine Sodium 15
Levothyroxine Sodium
15 claims
- Metformin Hcl 15
Metformin Hcl
15 claims
- Sertraline Hcl 15
Sertraline Hcl
15 claims
- Pantoprazole Sodium 13
Pantoprazole Sodium
13 claims
- Aripiprazole 12
Aripiprazole
12 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 40 |
| Metoprolol Succinate | 21 |
| Lisinopril | 16 |
| Levothyroxine Sodium | 15 |
| Metformin Hcl | 15 |
| Sertraline Hcl | 15 |
| Pantoprazole Sodium | 13 |
| Aripiprazole | 12 |
| Clopidogrel Clopidogrel Bisulfate | 12 |
| Hydrochlorothiazide | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Student in an Organized Health Care Education/Training Program in OR →
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Student in an Organized Health Care Education/Training Program Overview
How Riannon Atwater, MD fits within the Student in an Organized Health Care Education/Training Program landscape nationally.
331,274
Student in an Organized Health Care Education/Training Program Providers in US
55
States with Student in an Organized Health Care Education/Training Program
459
Avg Claims per Provider
Riannon Atwater, MD's 476 claims are above the specialty average of 459.
Nationwide Student in an Organized Health Care Education/Training Program peers with similar MIPS or enrollment year
Two federal-record peer sets for Atwater, both outside Oregon so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2022)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Student in an Organized Health Care Education/Training Program Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Atwater.
One of 4,110 Student in an Organized Health Care Education/Training Program providers enrolled in Oregon, 5 are shown here.
Frequently Asked Questions
What is Riannon Atwater, MD's specialty? ▼
Riannon Atwater, MD specializes in Student in an Organized Health Care Education/Training Program and practices in Portland, Oregon. Credentials: MD.
How much does Riannon Atwater, MD prescribe under Medicare Part D? ▼
In 2023, Riannon Atwater, MD wrote 476 Medicare Part D claims totaling $29K in drug costs for 70 beneficiaries.
Where is Riannon Atwater, MD located? ▼
Riannon Atwater, MD is located at 3181 SW SAM JACKSON PARK RD, Portland, OR, 97239. Phone: (503) 494-8211.
What is Riannon Atwater, MD's NPI number? ▼
Riannon Atwater, MD's National Provider Identifier (NPI) is 1952043374, issued on 04/07/2022.
How many Student in an Organized Health Care Education/Training Program providers are there in the US? ▼
There are 331,274 Student in an Organized Health Care Education/Training Program providers across 55 states in the US. The average Student in an Organized Health Care Education/Training Program provider writes 459 Medicare Part D claims per year.
What drugs does Riannon Atwater, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Riannon Atwater, MD's most frequently prescribed drugs include Atorvastatin Calcium, Metoprolol Succinate, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Riannon Atwater, MD accept Medicare? ▼
Riannon Atwater, MD appears in CMS Medicare data with 476 Part D claims and 70 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Riannon Atwater, MD's credentials? ▼
Riannon Atwater, MD's NPI is 1952043374 with credentials MD. 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.