Anthony Lam, MD
NPI 1659502839 · Internal Medicine Physician · Tustin, CA
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Anthony Lam, MD is a Internal Medicine Physician provider in Tustin, CA (NPI 1659502839).
Provider details
- NPI number
- 1659502839
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 254364 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
106 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 74 | $139 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 20 | $98 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 12 | $178 |
Typical Medicare-allowed amounts for these services range $98–$178 (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 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Relugolixbrand: Orgovyx | 98 | 15 |
| Anastrozole | 70 | 18 |
| Enzalutamidebrand: Xtandi | 61 | — |
| Darolutamidebrand: Nubeqa | 37 | — |
| Prednisone | 27 | — |
| Hydroxyurea | 22 | — |
| Cabozantinib S-Malatebrand: Cabometyx | 15 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$8,068 across 93 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-08-05
- Last updated
- 2015-03-03
Frequently asked questions
- What is Anthony Lam's NPI number?
- Anthony Lam's National Provider Identifier (NPI) is 1659502839, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Anthony Lam's specialty?
- Anthony Lam is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Anthony Lam located?
- Anthony Lam's practice location on file with NPPES is 2895 Edinger Ave, Tustin, CA 92780-7257.
- What is Anthony Lam's phone number?
- The practice phone number listed in the NPPES registry for Anthony Lam is (949) 381-5800.
- Does Anthony Lam accept Medicare?
- Anthony Lam is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Anthony Lam's NPI active?
- Yes — Anthony Lam's NPI (1659502839) is active in the NPPES registry as of the last update on 2015-03-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.