NPI registry status
Active
2026 NPPES data Endocrinology, Diabetes & Metabolism Physician NPI 1841421229 MD, PHD
Verify on CMS → Tim Arakawa, MD, PHD
Endocrinology, Diabetes & Metabolism Physician in Corvallis, 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 7,852 in Endocrinology, Diabetes & Metabolism Physician, 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
1K
Medicare Part D claims · 180 beneficiaries · Endocrinology, Diabetes & Metabolism Physician avg: 3K
Generic prescribing
47%
generic claims · 45% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
91.4/100
▲ 8 pts above national avg 83.1 · Exceptional
Industry payments
$81.06
4 payments · CMS Open Payments (Sunshine Act)
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
Tim Arakawa, MD, PHD reported a CMS MIPS final score of 91.4/100 - above the 83.1 national average - and filed 1,447 Medicare Part D claims in 2023.
- 91.4/100
- MIPS score · +8 vs avg
- 1K
- Part D claims, 2023
- 47%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Tim Arakawa, MD, PHD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
91 Top 37% higher than 63% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Tim Arakawa, MD, PHD sits
This provider among endocrinology, diabetes & metabolism physician peers
Across the 2,521 endocrinology, diabetes & metabolism physician providers who report both Medicare Part D prescribing and a MIPS quality score, Tim Arakawa, MD, PHD writes more Part D claims than 33% of them and scores higher on MIPS quality than 68% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one endocrinology, diabetes & metabolism physician peer from a representative sample of 60; the gold marker is Tim Arakawa, MD, PHD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Tim Arakawa, MD, PHD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 3 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Tim Arakawa, MD, PHD?
High performer (top quartile)Primary specialty
Endocrinology, Diabetes & Metabolism Physician
Medicare Part D claims
1,447 45% vs specialty avg
MIPS final score
91.4/100 8.3 pts vs avg
Specialty distribution in Oregon
How Endocrinology, Diabetes & Metabolism Physician compares to other specialties among Oregon providers
Medicare quality performance, MIPS
Tim Arakawa, MD, PHD's 2023 MIPS final score plotted against the Endocrinology, Diabetes & Metabolism Physician national average
- MIPS Final Score
- 91.4/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Endocrinology, Diabetes & Metabolism Physician) - 91.4/100 vs national avg 83.1
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).
Tim Arakawa, MD, PHD appears in the CMS NPPES registry as a Endocrinology, Diabetes & Metabolism Physician provider holding MD, PHD credentials at 3615 NW SAMARITAN DR STE G2, Corvallis, OR, 97330, with a listed phone of (541) 768-7900. NPI 1841421229 was issued on 08/03/2009.
Medicare Part D records for calendar year 2023 show 1,447 prescription claims written by this provider, covering 180 Medicare beneficiaries and totaling roughly $609K in drug spend, split 45% brand-name and 47% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 91.4/100 for the 2023 performance year (Quality 95.6, Cost 68.3), compared with the national average of 83.1.
Endocrinology, Diabetes & Metabolism Physician is a mid-sized specialty nationwide, with 7,852 enrolled providers across 54 states and an average of 2,639 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 | 1841421229 |
|---|---|
| Specialty | Endocrinology, Diabetes & Metabolism Physician |
| Credentials | MD, PHD |
| Gender | Male |
| NPI Issued | 08/03/2009 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
91.4019
Final Score
Avg: 83.1
95.6372
Quality
68.3289
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Tim Arakawa, MD, PHD 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.
According to CMS billing records, Tim Arakawa, MD, PHD is affiliated with 3 Medicare-billing facilities.
Albany General Hospital
Albany, OR
Good Samaritan Hospital Corvallis
Corvallis, OR
Mid-Valley Healthcare Inc
Lebanon, 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).
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 Tim Arakawa, MD, PHD. Source: openpaymentsdata.cms.gov.
Total received
$81
Largest payer
Abbott Laboratories
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 · Above average
Tim Arakawa, MD, PHD - brand share 45.0%
Endocrinology, Diabetes & Metabolism Physician average
45% brand-name claims vs 47% generic, on 1,447 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.
1,447
Total Claims
$609K
Total Drug Cost
180
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,729
- Total Day Supply
- 80,079
- Brand vs Generic
- 45% brand / 47% generic
- Brand Drug Cost
- $534K
- Generic Drug Cost
- $17K
Patient Demographics
- Average Patient Age
- 71.2 years
- Avg HCC Risk Score
- 1.48
- Gender Split
- 63% female / 37% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Tim Arakawa, MD, PHD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Levothyroxine Sodium
Levothyroxine Sodium
331 claims
- Methimazole 63
Methimazole
63 claims
- Synthroid 51
Synthroid
51 claims
- Jardiance 45
Jardiance
45 claims
- Tresiba Flextouch … 45
Tresiba Flextouch U-100
45 claims
- Humalog Kwikpen U-… 43
Humalog Kwikpen U-100
43 claims
- Hydrocortisone 42
Hydrocortisone
42 claims
- Alendronate Sodium 35
Alendronate Sodium
35 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 331 |
| Methimazole | 63 |
| Synthroid Levothyroxine Sodium | 51 |
| Jardiance Empagliflozin | 45 |
| Tresiba Flextouch U-100 Insulin Degludec | 45 |
| Humalog Kwikpen U-100 Insulin Lispro | 43 |
| Hydrocortisone | 42 |
| Alendronate Sodium | 35 |
| Metformin Hcl | 34 |
| Metformin Hcl Er Metformin Hcl | 34 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Endocrinology, Diabetes & Metabolism Physician in OR →
All providers in Oregon →
Compare specialties →
Endocrinology, Diabetes & Metabolism Physician Overview
How Tim Arakawa, MD, PHD fits within the Endocrinology, Diabetes & Metabolism Physician landscape nationally.
7,852
Endocrinology, Diabetes & Metabolism Physician Providers in US
54
States with Endocrinology, Diabetes & Metabolism Physician
2,639
Avg Claims per Provider
Tim Arakawa, MD, PHD's 1,447 claims are below the specialty average of 2,639.
Nearby Endocrinology, Diabetes & Metabolism Physician Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Arakawa.
Dr. Andrew Ahmann
MD
Portland, OR
Dr. Content Anderson
MD
Hermiston, OR
Dr. John Bagdade
M.D.
Springfield, OR
Dr. James Beard
MD
Portland, OR
Dr. Jonathan Bennion
M.D.
Corvallis, OR
Compare Endocrinology, Diabetes & Metabolism Physician 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 Endocrinology, Diabetes & Metabolism Physician 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 Tim Arakawa, MD, PHD's specialty? ▼
Tim Arakawa, MD, PHD specializes in Endocrinology, Diabetes & Metabolism Physician and practices in Corvallis, Oregon. Credentials: MD, PHD.
How much does Tim Arakawa, MD, PHD prescribe under Medicare Part D? ▼
In 2023, Tim Arakawa, MD, PHD wrote 1,447 Medicare Part D claims totaling $609K in drug costs for 180 beneficiaries.
What is Tim Arakawa, MD, PHD's Medicare quality score? ▼
Tim Arakawa, MD, PHD has a CMS MIPS Final Score of 91.4/100 (Quality: 95.6, Cost: 68.3). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Tim Arakawa, MD, PHD located? ▼
Tim Arakawa, MD, PHD is located at 3615 NW SAMARITAN DR STE G2, Corvallis, OR, 97330. Phone: (541) 768-7900.
What is Tim Arakawa, MD, PHD's NPI number? ▼
Tim Arakawa, MD, PHD's National Provider Identifier (NPI) is 1841421229, issued on 08/03/2009.
Does Tim Arakawa, MD, PHD prescribe more brand-name or generic drugs? ▼
Tim Arakawa, MD, PHD's prescribing is 45% brand-name and 47% generic drugs by claim count, with $534K in brand drug costs.
How many Endocrinology, Diabetes & Metabolism Physician providers are there in the US? ▼
There are 7,852 Endocrinology, Diabetes & Metabolism Physician providers across 54 states in the US. The average Endocrinology, Diabetes & Metabolism Physician provider writes 2,639 Medicare Part D claims per year.
What drugs does Tim Arakawa, MD, PHD prescribe most often? ▼
Based on 2023 Medicare Part D data, Tim Arakawa, MD, PHD's most frequently prescribed drugs include Levothyroxine Sodium, Methimazole, Synthroid. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Tim Arakawa, MD, PHD accept Medicare? ▼
Tim Arakawa, MD, PHD appears in CMS Medicare data with 1,447 Part D claims and 180 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Tim Arakawa, MD, PHD's credentials? ▼
Tim Arakawa, MD, PHD's NPI is 1841421229 with credentials MD, PHD. 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.
- 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 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.