Gene-Yuan Chang, MD
NPI 1467731828 · Nephrology Physician · Castro Valley, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gene-Yuan Chang, MD is a Nephrology Physician provider in Castro Valley, CA (NPI 1467731828).
Provider details
- NPI number
- 1467731828
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 121677 (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
14 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
1,947 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 494 | $87 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 252 | $401 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 221 | $152 |
| 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 | 176 | $19 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 161 | $131 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 51 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bumetanide | 113 | 28 |
| Carvedilol | 108 | 32 |
| Lisinopril | 98 | 28 |
| Furosemide | 95 | 33 |
| Amlodipine Besylate | 84 | 28 |
| Hydralazine Hcl | 77 | 20 |
| Allopurinol | 70 | 18 |
| Spironolactone | 64 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$711 across 30 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
- 2011-08-16
- Last updated
- 2025-04-25
- Certified
- 2025-04-25
Frequently asked questions
- What is Gene-Yuan Chang's NPI number?
- Gene-Yuan Chang's National Provider Identifier (NPI) is 1467731828, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gene-Yuan Chang's specialty?
- Gene-Yuan Chang is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Gene-Yuan Chang located?
- Gene-Yuan Chang's practice location on file with NPPES is 19850 Lake Chabot Rd, Castro Valley, CA 94546-4002.
- What is Gene-Yuan Chang's phone number?
- The practice phone number listed in the NPPES registry for Gene-Yuan Chang is (510) 881-1490.
- Does Gene-Yuan Chang accept Medicare?
- Gene-Yuan Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gene-Yuan Chang's NPI active?
- Yes — Gene-Yuan Chang's NPI (1467731828) is active in the NPPES registry as of the last update on 2025-04-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.