Tony Tseng, M.D., M.S.
NPI 1558523670 · Internal Medicine Physician · South Gate, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tony Tseng, M.D., M.S. is a Internal Medicine Physician provider in South Gate, CA (NPI 1558523670).
Provider details
- NPI number
- 1558523670
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.S.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A130532 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,107 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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 660 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 639 | $138 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 164 | $98 |
| Physician Or Allowed Practitioner Re-Certification for Medicare-Covered Home Health Services Under a Home Health Plan of Care (patient Not Present), Including Contacts With Home Health Agency and Review of Reports of Patient Status Required By Physicians aG0179 | 150 | $46 |
| Advance Care Planning, First 30 Minutes99497 | 108 | $87 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 114 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 335 | 110 |
| Metformin Hcl | 243 | 72 |
| Losartan Potassium | 227 | 76 |
| Gabapentin | 227 | 79 |
| Omeprazole | 222 | 76 |
| Furosemide | 189 | 58 |
| Amlodipine Besylate | 183 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$325 across 14 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
Additional practice locations (2)
- 8706 Imperial HwyDowney, CA 90242-3906Phone: (562) 746-0051Fax: (562) 299-5294
- 5979 Atlantic AveLong Beach, CA 90805-3510Phone: (562) 423-0421Fax: (562) 423-1032
Registry dates
- Enumerated
- 2008-06-30
- Last updated
- 2025-08-22
- Certified
- 2025-08-22
Frequently asked questions
- What is Tony Tseng's NPI number?
- Tony Tseng's National Provider Identifier (NPI) is 1558523670, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tony Tseng's specialty?
- Tony Tseng is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tony Tseng located?
- Tony Tseng's practice location on file with NPPES is 3224 Santa Ana St, South Gate, CA 90280-2306.
- What is Tony Tseng's phone number?
- The practice phone number listed in the NPPES registry for Tony Tseng is (323) 763-1300.
- Does Tony Tseng accept Medicare?
- Tony Tseng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tony Tseng's NPI active?
- Yes — Tony Tseng's NPI (1558523670) is active in the NPPES registry as of the last update on 2025-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.