Edwin Chiu, M.D.
NPI 1659392223 · Nephrology Physician · Napa, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Edwin Chiu, M.D. is a Nephrology Physician provider in Napa, CA (NPI 1659392223).
Provider details
- NPI number
- 1659392223
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A96262 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
52 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 52 | $84 |
Typical Medicare-allowed amounts for these services range $84–$84 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 108 | 48 |
| Losartan Potassium | 99 | 39 |
| Furosemide | 95 | 36 |
| Calcitriol | 81 | 29 |
| Lisinopril | 62 | 23 |
| Sevelamer Carbonate | 60 | 34 |
| Hydralazine Hcl | 47 | 19 |
| Patiromer Calcium Sorbitex |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-21
- Last updated
- 2021-12-15
Frequently asked questions
- What is Edwin Chiu's NPI number?
- Edwin Chiu's National Provider Identifier (NPI) is 1659392223, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Edwin Chiu's specialty?
- Edwin Chiu is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Edwin Chiu located?
- Edwin Chiu's practice location on file with NPPES is 3230 Beard Rd, Napa, CA 94558-3673.
- What is Edwin Chiu's phone number?
- The practice phone number listed in the NPPES registry for Edwin Chiu is (707) 253-7005.
- Does Edwin Chiu accept Medicare?
- Edwin Chiu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Edwin Chiu's NPI active?
- Yes — Edwin Chiu's NPI (1659392223) is active in the NPPES registry as of the last update on 2021-12-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.