David Hyun, MD
NPI 1255312005 · Cardiovascular Disease Physician · San Jose, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Hyun, MD is a Cardiovascular Disease Physician provider in San Jose, CA (NPI 1255312005).
Provider details
- NPI number
- 1255312005
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 10025R (LA)
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 tenure25% of score
20 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
1,770 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 High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 976 | $228 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 176 | $271 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 101 | $275 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 86 | $81 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 77 | $141 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 75 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 369 | 117 |
| Amlodipine Besylate | 302 | 90 |
| Apixabanbrand: Eliquis | 267 | 66 |
| Losartan Potassium | 213 | 64 |
| Spironolactone | 172 | 59 |
| Metoprolol Succinate | 150 | 46 |
| Ezetimibe |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,079 across 49 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
- 2005-11-09
- Last updated
- 2023-05-06
- Certified
- 2023-05-06
Frequently asked questions
- What is David Hyun's NPI number?
- David Hyun's National Provider Identifier (NPI) is 1255312005, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Hyun's specialty?
- David Hyun is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is David Hyun located?
- David Hyun's practice location on file with NPPES is 2020 Forest Ave Ste. 3, San Jose, CA 95128-4805.
- What is David Hyun's phone number?
- The practice phone number listed in the NPPES registry for David Hyun is (408) 298-0433.
- Does David Hyun accept Medicare?
- David Hyun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Hyun's NPI active?
- Yes — David Hyun's NPI (1255312005) is active in the NPPES registry as of the last update on 2023-05-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.