James Chun, M.D.
NPI 1134143506 · Cardiovascular Disease Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Chun, M.D. is a Cardiovascular Disease Physician provider in San Francisco, CA (NPI 1134143506).
Provider details
- NPI number
- 1134143506
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G75949 (CA)
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
19 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
1,146 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 | 401 | $154 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 132 | $88 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 98 | $76 |
| Evaluation of Single, Dual, Multiple Lead Or Leadless Pacemaker System93288 | 94 | $73 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 83 | $18 |
| Ultrasound of Heart With Continuous Electrocardiogram (ecg) During Rest, Exercise And/Or Drug Induced Stress With Review and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 36 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 324 | 96 |
| Metoprolol Succinate | 290 | 91 |
| Apixabanbrand: Eliquis | 231 | 65 |
| Amlodipine Besylate | 211 | 59 |
| Rivaroxabanbrand: Xarelto | 187 | 56 |
| Losartan Potassium | 148 | 39 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$419 across 6 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
- 2006-07-27
- Last updated
- 2008-04-25
Frequently asked questions
- What is James Chun's NPI number?
- James Chun's National Provider Identifier (NPI) is 1134143506, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Chun's specialty?
- James Chun is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is James Chun located?
- James Chun's practice location on file with NPPES is 2250 Hayes St, San Francisco, CA 94117-1078.
- What is James Chun's phone number?
- The practice phone number listed in the NPPES registry for James Chun is (415) 933-9100.
- Does James Chun accept Medicare?
- James Chun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Chun's NPI active?
- Yes — James Chun's NPI (1134143506) is active in the NPPES registry as of the last update on 2008-04-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.