Quick answers
- Does William M. Lewis accept Medicare assignment?
- Yes. Medicare's clinician data says William M. Lewis accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does William M. Lewis see?
- In 2024, CMS data shows 548 Original Medicare patients and 19,047 services for William M. Lewis. This counts Original Medicare only and measures volume, not quality.
- What is William M. Lewis's NPI number?
- 1265401350. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for William M. Lewis, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 548 |
|---|---|
| Services billed to Medicare | 19,047 |
| Different services or procedures | 112 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)381 services
- Insertion of needle into vein for collection of blood sample (36415)284 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)240 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)202 services
- Blood test, comprehensive group of blood chemicals (80053)185 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure73%
- Arthritis45%
- Ischemic heart disease32%
- Diabetes30%
- Depression22%
Hospitals where William M. Lewis works
Medicare's Facility Affiliation Data lists William M. Lewis at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- CHI St Joseph Health Regional HospitalBryan, TX · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 450011
- North Austin Medical CenterAustin, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 450809
- Round Rock Medical CenterRound Rock, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 450718
- St David's Medical CenterAustin, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 450431
Practice locations
Addresses where William M. Lewis is enrolled with Medicare (CMS data updated October 2, 2026).
- 12221 N Mopac ExpyAustin, TX 78758 (512) 901‑2530
- 12221 N Mopac Expy, St. David'S North Austin Medical CenterAustin, TX 78758 (512) 901‑2530
- 2400 Cedar Bend DrAustin, TX 78758
Group practices
Medicare enrollment lists William M. Lewis as a member of this group (CMS data updated October 2, 2026).
- The Austin Diagnostic Clinic PLLC86 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Austin
Clinicians with the same Medicare primary specialty in Austin, TX — not a recommendation.
Other clinicians in The Austin Diagnostic Clinic PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | New York College Of Osteo Medicine Of New York Institute Of Technology |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1265401350 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians