Benjamin Tsai, M.D.
NPI 1841533502 · Hospitalist Physician · Berkeley, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Benjamin Tsai, M.D. is a Hospitalist Physician provider in Berkeley, CA (NPI 1841533502).
Provider details
- NPI number
- 1841533502
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 1841533502 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
380 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 220 | $132 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 82 | $130 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 35 | $193 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 27 | $87 |
| Critical Care, First 30-74 Minutes99291 | 16 | $230 |
Typical Medicare-allowed amounts for these services range $87–$230 (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
Additional practice locations (1)
- 4647 Zion AveKaiser Permanente San Diego - Hospital MedicineSan Diego, CA 92120-2507Phone: (619) 528-5435
Registry dates
- Enumerated
- 2013-04-01
- Last updated
- 2021-02-17
- Certified
- 2021-02-17
Frequently asked questions
- What is Benjamin Tsai's NPI number?
- Benjamin Tsai's National Provider Identifier (NPI) is 1841533502, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Benjamin Tsai's specialty?
- Benjamin Tsai is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Benjamin Tsai located?
- Benjamin Tsai's practice location on file with NPPES is 2450 Ashby Ave, Berkeley, CA 94705-2067.
- What is Benjamin Tsai's phone number?
- The practice phone number listed in the NPPES registry for Benjamin Tsai is (510) 204-4444.
- Does Benjamin Tsai accept Medicare?
- Benjamin Tsai is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Benjamin Tsai's NPI active?
- Yes — Benjamin Tsai's NPI (1841533502) is active in the NPPES registry as of the last update on 2021-02-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.