NPI registry status
Active
2026 NPPES data Critical Care Medicine (Internal Medicine) Physician NPI 1376592477 MD
Verify on CMS → Walter Willoughby, MD
Critical Care Medicine (Internal Medicine) Physician in Las Vegas, Nevada.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,646 in Critical Care Medicine (Internal Medicine) 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
3K
Medicare Part D claims · 393 beneficiaries · Critical Care Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
49%
generic claims · 49% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
74.6/100
▼ 9 pts below national avg 83.1 · Mid-tier
Industry payments
$1.4K
68 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
Walter Willoughby, MD reported a CMS MIPS final score of 74.6/100 - below the 83.1 national average - and filed 3,019 Medicare Part D claims in 2023.
- 74.6/100
- MIPS score · -9 vs avg
- 3K
- Part D claims, 2023
- 49%
- 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.
Walter Willoughby, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
75 12th percentile higher than 12% 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 Walter Willoughby, MD sits
This provider among critical care medicine (internal medicine) physician peers
Across the 1,643 critical care medicine (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Walter Willoughby, MD writes more Part D claims than 89% of them and scores higher on MIPS quality than 12% - placing this provider in the high-volume, lower-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 critical care medicine (internal medicine) physician peer from a representative sample of 60; the gold marker is Walter Willoughby, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Walter Willoughby, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Walter Willoughby, MD?
Below national averagePrimary specialty
Critical Care Medicine (Internal Medicine) Physician
Medicare Part D claims
3,019 182% vs specialty avg
MIPS final score
74.6/100 8.5 pts vs avg
Specialty distribution in Nevada
How Critical Care Medicine (Internal Medicine) Physician compares to other specialties among Nevada providers
Medicare quality performance, MIPS
Walter Willoughby, MD's 2023 MIPS final score plotted against the Critical Care Medicine (Internal Medicine) Physician national average
- MIPS Final Score
- 74.6/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Critical Care Medicine (Internal Medicine) Physician) - 74.6/100 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).
Walter Willoughby, MD appears in the CMS NPPES registry as a Critical Care Medicine (Internal Medicine) Physician provider holding MD credentials at 10105 BANBURRY CROSS DR STE 355, Las Vegas, NV, 89144, with a listed phone of (702) 409-3069. NPI 1376592477 was issued on 05/08/2006.
Medicare Part D records for calendar year 2023 show 3,019 prescription claims written by this provider, covering 393 Medicare beneficiaries and totaling roughly $2.1 million in drug spend, split 49% brand-name and 49% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 74.6/100 for the 2023 performance year (Quality 62.8, Cost 54.1), compared with the national average of 83.1.
Critical Care Medicine (Internal Medicine) Physician is a mid-sized specialty nationwide, with 6,646 enrolled providers across 53 states and an average of 1,069 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 | 1376592477 |
|---|---|
| Specialty | Critical Care Medicine (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/08/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
74.5813
Final Score
Avg: 83.1
62.8032
Quality
54.1345
Cost
98
Promoting Interoperability
Reporting: Individual
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 Walter Willoughby, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.4K
Largest payer
AstraZeneca Pharmaceuticals LP
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
Walter Willoughby, MD - brand share 49.0%
Critical Care Medicine (Internal Medicine) Physician average
49% brand-name claims vs 49% generic, on 3,019 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.
3,019
Total Claims
$2.1M
Total Drug Cost
393
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,915
- Total Day Supply
- 93,380
- Brand vs Generic
- 49% brand / 49% generic
- Brand Drug Cost
- $2.1M
- Generic Drug Cost
- $58K
- Antibiotic Claims
- 442
Patient Demographics
- Average Patient Age
- 75.4 years
- Avg HCC Risk Score
- 1.78
- Gender Split
- 59% female / 41% male
- Age Distribution
- <65: 23, 65-74: 151, 75-84: 167, 85+: 52
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Walter Willoughby, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisone
Prednisone
445 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
348 claims
- Symbicort
Symbicort
247 claims
- Trelegy Ellipta
Trelegy Ellipta
229 claims
- Breztri Aerosphere
Breztri Aerosphere
195 claims
- Azithromycin 140
Azithromycin
140 claims
- Doxycycline Hyclate 139
Doxycycline Hyclate
139 claims
- Montelukast Sodium 98
Montelukast Sodium
98 claims
| Drug | Claims |
|---|---|
| Prednisone | 445 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 348 |
| Symbicort Budesonide/Formoterol Fumarate | 247 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 229 |
| Breztri Aerosphere Budesonide/Glycopyr/Formoterol | 195 |
| Azithromycin | 140 |
| Doxycycline Hyclate | 139 |
| Montelukast Sodium | 98 |
| Spiriva Respimat Tiotropium Bromide | 93 |
| Ofev Nintedanib Esylate | 85 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Critical Care Medicine (Internal Medicine) Physician in NV →
All providers in Nevada →
Compare specialties →
Critical Care Medicine (Internal Medicine) Physician Overview
How Walter Willoughby, MD fits within the Critical Care Medicine (Internal Medicine) Physician landscape nationally.
6,646
Critical Care Medicine (Internal Medicine) Physician Providers in US
53
States with Critical Care Medicine (Internal Medicine) Physician
1,069
Avg Claims per Provider
Walter Willoughby, MD's 3,019 claims are above the specialty average of 1,069.
Nearby Critical Care Medicine (Internal Medicine) Physician Providers in Nevada
Other clinicians with the same primary specialty enrolled in Nevada, drawn from the same CMS NPPES roster as Willoughby.
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 Nevada medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Critical Care Medicine (Internal Medicine) 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 Walter Willoughby, MD's specialty? ▼
Walter Willoughby, MD specializes in Critical Care Medicine (Internal Medicine) Physician and practices in Las Vegas, Nevada. Credentials: MD.
How much does Walter Willoughby, MD prescribe under Medicare Part D? ▼
In 2023, Walter Willoughby, MD wrote 3,019 Medicare Part D claims totaling $2.1M in drug costs for 393 beneficiaries.
What is Walter Willoughby, MD's Medicare quality score? ▼
Walter Willoughby, MD has a CMS MIPS Final Score of 74.6/100 (Quality: 62.8, Cost: 54.1). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Walter Willoughby, MD located? ▼
Walter Willoughby, MD is located at 10105 BANBURRY CROSS DR STE 355, Las Vegas, NV, 89144. Phone: (702) 409-3069.
What is Walter Willoughby, MD's NPI number? ▼
Walter Willoughby, MD's National Provider Identifier (NPI) is 1376592477, issued on 05/08/2006.
Does Walter Willoughby, MD prescribe more brand-name or generic drugs? ▼
Walter Willoughby, MD's prescribing is 49% brand-name and 49% generic drugs by claim count, with $2.1M in brand drug costs.
How many Critical Care Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 6,646 Critical Care Medicine (Internal Medicine) Physician providers across 53 states in the US. The average Critical Care Medicine (Internal Medicine) Physician provider writes 1,069 Medicare Part D claims per year.
What drugs does Walter Willoughby, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Walter Willoughby, MD's most frequently prescribed drugs include Prednisone, Albuterol Sulfate Hfa, Symbicort. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Walter Willoughby, MD accept Medicare? ▼
Walter Willoughby, MD appears in CMS Medicare data with 3,019 Part D claims and 393 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Walter Willoughby, MD's credentials? ▼
Walter Willoughby, MD's NPI is 1376592477 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.
- 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.
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.