NPI registry status
Active
2026 NPPES data Specialist NPI 1235247784 M. D.
Verify on CMS → James Knackstedt, M. D.
Specialist in Eugene, 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 69,608 in Specialist, 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
940
Medicare Part D claims · 318 beneficiaries · Specialist avg: 1K
Generic prescribing
94%
generic claims · 6% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$186.6
3 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
James Knackstedt, M. D. filed 940 Medicare Part D claims in 2023 as a Specialist in Eugene, Oregon, prescribing 94% generic.
- 940
- Part D claims, 2023
- 94%
- generic prescribing
- $186.6
- 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.
James Knackstedt, M. D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
940 Top 25% higher than 75% 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 James Knackstedt, M. D.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
940 36% vs specialty avg
Specialty distribution in Oregon
How Specialist 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 Specialist. 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).
James Knackstedt, M. D. appears in the CMS NPPES registry as a Specialist provider holding M. D. credentials at 995 WILLAGILLESPIE RD STE 300C, Eugene, OR, 97401, with a listed phone of (541) 302-1420. NPI 1235247784 was issued on 08/25/2006.
Medicare Part D records for calendar year 2023 show 940 prescription claims written by this provider, covering 318 Medicare beneficiaries and totaling roughly $47K in drug spend, split 6% brand-name and 94% generic by claim count, with an opioid prescribing rate of 2.8%.
Specialist is a high-volume specialty nationwide, with 69,608 enrolled providers across 55 states and an average of 1,474 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 | 1235247784 |
|---|---|
| Specialty | Specialist |
| Credentials | M. D. |
| Gender | Male |
| NPI Issued | 08/25/2006 |
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 James Knackstedt, M. D.. Source: openpaymentsdata.cms.gov.
Total received
$187
Largest payer
Hologic Sales and Service, LLC
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 · Generic-heavy
James Knackstedt, M. D. - brand share 6.0%
Specialist average
6% brand-name claims vs 94% generic, on 940 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.
940
Total Claims
$47K
Total Drug Cost
318
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,175
- Total Day Supply
- 28,308
- Brand vs Generic
- 6% brand / 94% generic
- Brand Drug Cost
- $16K
- Generic Drug Cost
- $30K
- Opioid Claims
- 26 (2.8% rate)
- Antibiotic Claims
- 194
Patient Demographics
- Average Patient Age
- 72.3 years
- Avg HCC Risk Score
- 1.03
- Gender Split
- 65% female / 35% male
- Age Distribution
- <65: 29, 65-74: 159, 75-84: 112, 85+: 18
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What James Knackstedt, M. D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Fluticasone Propio…
Fluticasone Propionate
109 claims
- Ipratropium Bromide
Ipratropium Bromide
88 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
66 claims
- Pentoxifylline
Pentoxifylline
64 claims
- Gabapentin 41
Gabapentin
41 claims
- Mometasone Furoate 39
Mometasone Furoate
39 claims
- Pregabalin 39
Pregabalin
39 claims
- Triamterene-Hydroc… 36
Triamterene-Hydrochlorothiazid
36 claims
| Drug | Claims |
|---|---|
| Fluticasone Propionate | 109 |
| Ipratropium Bromide | 88 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 66 |
| Pentoxifylline | 64 |
| Gabapentin | 41 |
| Mometasone Furoate | 39 |
| Pregabalin | 39 |
| Triamterene-Hydrochlorothiazid Triamterene/Hydrochlorothiazid | 36 |
| Prednisone | 34 |
| Betamethasone Valerate | 30 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How James Knackstedt, M. D. fits within the Specialist landscape nationally.
69,608
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
James Knackstedt, M. D.'s 940 claims are below the specialty average of 1,474.
Nearby Specialist Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Knackstedt.
Taylor Abrigo
Portland, OR
Dr. Jeffrey Absalon
MD
Bend, OR
Dr. Christopher Adams
CRM
Albany, OR
Dr. Ross Adams
LMT
Ashland, OR
Dr. Daryl Adamson
MD
Portland, OR
Compare Specialist 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 Specialist 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 James Knackstedt, M. D.'s specialty? ▼
James Knackstedt, M. D. specializes in Specialist and practices in Eugene, Oregon. Credentials: M. D..
How much does James Knackstedt, M. D. prescribe under Medicare Part D? ▼
In 2023, James Knackstedt, M. D. wrote 940 Medicare Part D claims totaling $47K in drug costs for 318 beneficiaries.
Where is James Knackstedt, M. D. located? ▼
James Knackstedt, M. D. is located at 995 WILLAGILLESPIE RD STE 300C, Eugene, OR, 97401. Phone: (541) 302-1420.
What is James Knackstedt, M. D.'s NPI number? ▼
James Knackstedt, M. D.'s National Provider Identifier (NPI) is 1235247784, issued on 08/25/2006.
Does James Knackstedt, M. D. prescribe more brand-name or generic drugs? ▼
James Knackstedt, M. D.'s prescribing is 6% brand-name and 94% generic drugs by claim count, with $16K in brand drug costs.
Does James Knackstedt, M. D. prescribe opioids? ▼
Yes, James Knackstedt, M. D. had 26 opioid claims in 2023 with an opioid prescribing rate of 2.8%.
How many Specialist providers are there in the US? ▼
There are 69,608 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does James Knackstedt, M. D. prescribe most often? ▼
Based on 2023 Medicare Part D data, James Knackstedt, M. D.'s most frequently prescribed drugs include Fluticasone Propionate, Ipratropium Bromide, Amoxicillin-Clavulanate Potass. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does James Knackstedt, M. D. accept Medicare? ▼
James Knackstedt, M. D. appears in CMS Medicare data with 940 Part D claims and 318 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify James Knackstedt, M. D.'s credentials? ▼
James Knackstedt, M. D.'s NPI is 1235247784 with credentials M. D.. 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.