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Compare the published Medicare service mix of Walter J Willoughby, MD with clinicians in the same registry specialty: Critical Care (Intensivists) · Internal Medicine · Pulmonary Disease (CMS).

LAS VEGAS, NV · Exact areaEdit location

2024 published service data · 32 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

John J Wojcik, MD

Critical Care (Intensivists) · Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Evaluation of use of breathing device (94664)
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
51%Service-mix similarityView profile →

Karishma Bhatia Mehta, MD

Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Evaluation of use of breathing device (94664)
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
46%Service-mix similarityView profile →

John B Collier, MD

Critical Care (Intensivists) · Pulmonary Disease · Sleep Medicine (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Evaluation of use of breathing device (94664)
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
40%Service-mix similarityView profile →

Antonio Martin Flores Erazo, MD

Critical Care (Intensivists) · Internal Medicine · Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Evaluation of use of breathing device (94664)
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
39%Service-mix similarityView profile →

Nisarg J Changawala, MD

Internal Medicine (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Evaluation of use of breathing device (94664)
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
  • Test to examine how well the lungs exchange gases (94729)
39%Service-mix similarityView profile →

Kamran A Khan, MD

Internal Medicine · Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Inhalation treatment for airway obstruction or sputum production (94640)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Evaluation of use of breathing device (94664)
36%Service-mix similarityView profile →

Ralph M Nietrzeba, MD

Specialty details in registry · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
  • Test to examine how well the lungs exchange gases (94729)
  • Blood count, hemoglobin (85018)
33%Service-mix similarityView profile →

George S Tu, MD

Critical Care (Intensivists) · Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
  • Test to examine how well the lungs exchange gases (94729)
31%Service-mix similarityView profile →

Vishisht Mehta, MD

Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
  • Test to examine how well the lungs exchange gases (94729)
29%Service-mix similarityView profile →

Robert M Lampert, MD

Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
  • Test to examine how well the lungs exchange gases (94729)
21%Service-mix similarityView profile →

Anees Arshad, MD

Internal Medicine · Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
  • Test to examine how well the lungs exchange gases (94729)
  • Test to determine lung volumes using gas dilution or washout (94727)
20%Service-mix similarityView profile →

Angelica Elizabeth Honsberg, MD

Pulmonary Disease (CMS) · Las Vegas, NV

Shared published services
2 shared services · view billing descriptions
  • Test to measure expiratory airflow and volume changes before and after medication administration (94060)
  • Test to examine how well the lungs exchange gases (94729)
15%Service-mix similarityView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in NPI order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.