Geoffrey Tsoi, DO
NPI 1497100606 · Family Medicine Physician · Lancaster, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Geoffrey Tsoi, DO is a Family Medicine Physician provider in Lancaster, CA (NPI 1497100606).
Provider details
- NPI number
- 1497100606
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 20A17304 (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
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
65 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 42 | $99 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 23 | $139 |
Typical Medicare-allowed amounts for these services range $99–$139 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Nirmatrelvir/Ritonavirbrand: Paxlovid | 14 | 14 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 11 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (3)
- 415 N Crescent Dr Ste 320Beverly Hills, CA 90210-6813Phone: (888) 803-3370Fax: (888) 803-3331
- 333 1st St Ste aSan Francisco, CA 94105-2661Phone: (888) 803-3370Fax: (888) 803-3331
- 156 William St Rm 303New York, NY 10038-5307Phone: (888) 803-3370
Registry dates
- Enumerated
- 2016-04-26
- Last updated
- 2026-03-19
- Certified
- 2026-03-19
Frequently asked questions
- What is Geoffrey Tsoi's NPI number?
- Geoffrey Tsoi's National Provider Identifier (NPI) is 1497100606, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Geoffrey Tsoi's specialty?
- Geoffrey Tsoi is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Geoffrey Tsoi located?
- Geoffrey Tsoi's practice location on file with NPPES is 43322 Gingham Ave, Lancaster, CA 93535-4576.
- What is Geoffrey Tsoi's phone number?
- The practice phone number listed in the NPPES registry for Geoffrey Tsoi is (661) 874-4050.
- Does Geoffrey Tsoi accept Medicare?
- Geoffrey Tsoi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Geoffrey Tsoi's NPI active?
- Yes — Geoffrey Tsoi's NPI (1497100606) is active in the NPPES registry as of the last update on 2026-03-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.