Bertran Hsieh, M.D.
NPI 1336330323 · Internal Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Bertran Hsieh, M.D. is a Internal Medicine Physician provider in Los Angeles, CA (NPI 1336330323).
Provider details
- NPI number
- 1336330323
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A96016 (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
18 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
36 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 | 36 | $99 |
Typical Medicare-allowed amounts for these services range $99–$99 (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 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 235 | 78 |
| Amlodipine Besylate | 145 | 58 |
| Metformin Hcl | 98 | 33 |
| Losartan Potassium | 82 | 30 |
| Benazepril Hcl | 63 | 26 |
| Lisinopril | 47 | 21 |
| Hydrochlorothiazide | 47 | 20 |
Practice location
Mailing address
Additional practice locations (1)
- 2603 Via CampoMontebello, CA 90640-1807Phone: (323) 720-1144
Registry dates
- Enumerated
- 2007-08-06
- Last updated
- 2026-03-09
- Certified
- 2026-03-09
Frequently asked questions
- What is Bertran Hsieh's NPI number?
- Bertran Hsieh's National Provider Identifier (NPI) is 1336330323, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Bertran Hsieh's specialty?
- Bertran Hsieh is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Bertran Hsieh located?
- Bertran Hsieh's practice location on file with NPPES is 1120 W Washington Blvd Ste 2b, Los Angeles, CA 90015-3316.
- What is Bertran Hsieh's phone number?
- The practice phone number listed in the NPPES registry for Bertran Hsieh is (213) 623-2225.
- Does Bertran Hsieh accept Medicare?
- Bertran Hsieh is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Bertran Hsieh's NPI active?
- Yes — Bertran Hsieh's NPI (1336330323) is active in the NPPES registry as of the last update on 2026-03-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.