NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1275038093 D.O.
Verify on CMS → William Diehl, D.O.
Hospitalist Physician in Bonners Ferry, Idaho.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,938 in Hospitalist 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
867
Medicare Part D claims · 121 beneficiaries · Hospitalist Physician avg: 888
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
William Diehl, D.O. filed 867 Medicare Part D claims in 2023 as a Hospitalist Physician in Bonners Ferry, Idaho.
- 867
- Part D claims, 2023
- 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.
William Diehl, D.O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
867 Top 27% higher than 73% 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
✓
Board certification likely (heuristic, not verified)
William Diehl, D.O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 William Diehl, D.O.?
Quality data not reportedPrimary specialty
Hospitalist Physician
Medicare Part D claims
867 2% vs specialty avg
Specialty distribution in Idaho
How Hospitalist Physician compares to other specialties among Idaho 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 Hospitalist Physician. 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).
William Diehl, D.O. appears in the CMS NPPES registry as a Hospitalist Physician provider holding D.O. credentials at 6640 KANIKSU ST, Bonners Ferry, ID, 83805, with a listed phone of (208) 267-3141. NPI 1275038093 was issued on 03/25/2018.
Medicare Part D records for calendar year 2023 show 867 prescription claims written by this provider, covering 121 Medicare beneficiaries and totaling roughly $92K in drug spend, with an opioid prescribing rate of 8.4%.
Hospitalist Physician is a mid-sized specialty nationwide, with 16,938 enrolled providers across 54 states and an average of 888 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 | 1275038093 |
|---|---|
| Specialty | Hospitalist Physician |
| Credentials | D.O. |
| Gender | Male |
| NPI Issued | 03/25/2018 |
Hospital and facility affiliations
Facilities where William Diehl, D.O. 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.
Boundary Community Hospital
Bonners Ferry, ID
Critical Access Hospitals
CMS CCN: 131301
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
867
Total Claims
$92K
Total Drug Cost
121
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 998
- Total Day Supply
- 26,424
- Generic Drug Cost
- $11K
- Opioid Claims
- 73 (8.4% rate)
- Antibiotic Claims
- 55
Patient Demographics
- Average Patient Age
- 77.5 years
- Avg HCC Risk Score
- 1.76
- Gender Split
- 56% female / 44% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Diehl, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
40 claims
- Losartan Potassium
Losartan Potassium
39 claims
- Gabapentin
Gabapentin
30 claims
- Furosemide
Furosemide
29 claims
- Jardiance
Jardiance
28 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
24 claims
- Metoprolol Succinate
Metoprolol Succinate
24 claims
- Alendronate Sodium
Alendronate Sodium
22 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 40 |
| Losartan Potassium | 39 |
| Gabapentin | 30 |
| Furosemide | 29 |
| Jardiance Empagliflozin | 28 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 24 |
| Metoprolol Succinate | 24 |
| Alendronate Sodium | 22 |
| Mirtazapine | 22 |
| Potassium Chloride | 22 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hospitalist Physician Overview
How William Diehl, D.O. fits within the Hospitalist Physician landscape nationally.
16,938
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
888
Avg Claims per Provider
William Diehl, D.O.'s 867 claims are below the specialty average of 888.
Nearby Hospitalist Physician Providers in Idaho
Other clinicians with the same primary specialty enrolled in Idaho, drawn from the same CMS NPPES roster as Diehl.
Dr. Ann Agnew
MD
Meridian, ID
Tausha Allen
Idaho Falls, ID
Dr. Uzochukwu Amadi
MD
Nampa, ID
Dr. Stephanie Arar
MD
St Maries, ID
Dr. Aubrey Arensdorf
DO
Boise, ID
Compare Hospitalist 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 Idaho medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hospitalist 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 William Diehl, D.O.'s specialty? ▼
William Diehl, D.O. specializes in Hospitalist Physician and practices in Bonners Ferry, Idaho. Credentials: D.O..
How much does William Diehl, D.O. prescribe under Medicare Part D? ▼
In 2023, William Diehl, D.O. wrote 867 Medicare Part D claims totaling $92K in drug costs for 121 beneficiaries.
Where is William Diehl, D.O. located? ▼
William Diehl, D.O. is located at 6640 KANIKSU ST, Bonners Ferry, ID, 83805. Phone: (208) 267-3141.
What is William Diehl, D.O.'s NPI number? ▼
William Diehl, D.O.'s National Provider Identifier (NPI) is 1275038093, issued on 03/25/2018.
Does William Diehl, D.O. prescribe opioids? ▼
Yes, William Diehl, D.O. had 73 opioid claims in 2023 with an opioid prescribing rate of 8.4%.
How many Hospitalist Physician providers are there in the US? ▼
There are 16,938 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 888 Medicare Part D claims per year.
What drugs does William Diehl, D.O. prescribe most often? ▼
Based on 2023 Medicare Part D data, William Diehl, D.O.'s most frequently prescribed drugs include Atorvastatin Calcium, Losartan Potassium, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Diehl, D.O. accept Medicare? ▼
William Diehl, D.O. appears in CMS Medicare data with 867 Part D claims and 121 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Diehl, D.O.'s credentials? ▼
William Diehl, D.O.'s NPI is 1275038093 with credentials D.O.. 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.