Lewis Tsai
NPI 1538620810 · Family Medicine Physician · Round Rock, TX
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lewis Tsai is a Family Medicine Physician provider in Round Rock, TX (NPI 1538620810).
Provider details
- NPI number
- 1538620810
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- Yes
- License
- V2584 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
7 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
11 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 11 | $155 |
Typical Medicare-allowed amounts for these services range $155–$155 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-03-28
- Last updated
- 2026-01-08
- Certified
- 2026-01-08
Frequently asked questions
- What is Lewis Tsai's NPI number?
- Lewis Tsai's National Provider Identifier (NPI) is 1538620810, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lewis Tsai's specialty?
- Lewis Tsai is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Lewis Tsai located?
- Lewis Tsai's practice location on file with NPPES is 7200 Wyoming Springs Dr Ste 600, Round Rock, TX 78681-4305.
- What is Lewis Tsai's phone number?
- The practice phone number listed in the NPPES registry for Lewis Tsai is (512) 244-1995.
- Does Lewis Tsai accept Medicare?
- Lewis Tsai is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lewis Tsai's NPI active?
- Yes — Lewis Tsai's NPI (1538620810) is active in the NPPES registry as of the last update on 2026-01-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.