Thomas Yun, MD
NPI 1336431568 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Yun, MD is a Internal Medicine Physician provider in Oakland, CA (NPI 1336431568).
Provider details
- NPI number
- 1336431568
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A136957 (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
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
788 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 | 492 | $131 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 76 | $135 |
| 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 | 72 | $17 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 42 | $180 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 42 | $96 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 47 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 118 | 46 |
| Amlodipine Besylate | 101 | 42 |
| Rosuvastatin Calcium | 75 | 36 |
| Losartan Potassium | 67 | 26 |
| Lisinopril | 56 | 22 |
| Levothyroxine Sodium | 56 | 25 |
| Tamsulosin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-05-05
- Last updated
- 2020-02-25
- Certified
- 2020-02-25
Frequently asked questions
- What is Thomas Yun's NPI number?
- Thomas Yun's National Provider Identifier (NPI) is 1336431568, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Yun's specialty?
- Thomas Yun is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Yun located?
- Thomas Yun's practice location on file with NPPES is 1411 E 31st St, Oakland, CA 94602-1018.
- What is Thomas Yun's phone number?
- The practice phone number listed in the NPPES registry for Thomas Yun is (510) 437-4965.
- Does Thomas Yun accept Medicare?
- Thomas Yun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Yun's NPI active?
- Yes — Thomas Yun's NPI (1336431568) is active in the NPPES registry as of the last update on 2020-02-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.