Tat Lam, MD
NPI 1134288749 · Family Medicine Physician · Orange, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tat Lam, MD is a Family Medicine Physician provider in Orange, CA (NPI 1134288749).
Provider details
- NPI number
- 1134288749
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A62418 (CA)
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
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
378 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 107 | $137 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 56 | $99 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 37 | $120 |
| Detection Test By Immunoassay With Direct Visual Observation for Influenza Virus87804 | 32 | $16 |
| X-Ray of Chest, 2 Views71046 | 27 | $27 |
| Inhalation Treatment for Airway Obstruction Or Sputum Production94640 | 25 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ipratropium Bromide | 167 | 166 |
| Cefuroxime Axetilbrand: Cefuroxime | 123 | 122 |
| Doxycycline Hyclate | 58 | 58 |
| Cefdinir | 51 | 51 |
| Lidocaine | 46 | 45 |
| Mupirocin | 45 | 45 |
| Tiotropium Bromidebrand: Spiriva Respimat | 36 | 34 |
| Hydrocodone/Acetaminophen |
Practice location
Mailing address
Additional practice locations (2)
- 15855 Pomona Rincon Rd Bldg 4Chino Hills, CA 91709-3162Phone: (909) 929-2511
- 2251 N Harbor BlvdFullerton, CA 92835-2601Phone: (714) 449-6230
Registry dates
- Enumerated
- 2006-12-08
- Last updated
- 2022-04-01
- Certified
- 2022-04-01
Frequently asked questions
- What is Tat Lam's NPI number?
- Tat Lam's National Provider Identifier (NPI) is 1134288749, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tat Lam's specialty?
- Tat Lam is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tat Lam located?
- Tat Lam's practice location on file with NPPES is 2501 E Chapman Ave Ste 204, Orange, CA 92869-3204.
- What is Tat Lam's phone number?
- The practice phone number listed in the NPPES registry for Tat Lam is (714) 628-3230.
- Does Tat Lam accept Medicare?
- Tat Lam is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tat Lam's NPI active?
- Yes — Tat Lam's NPI (1134288749) is active in the NPPES registry as of the last update on 2022-04-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.