Ken Chiu, MD
NPI 1639126691 · Endocrinology, Diabetes & Metabolism Physician · Duarte, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ken Chiu, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Duarte, CA (NPI 1639126691).
Provider details
- NPI number
- 1639126691
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A45428 (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 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
199 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 | 159 | $139 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 40 | $179 |
Typical Medicare-allowed amounts for these services range $139–$179 (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 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Semaglutidebrand: Ozempic | 257 | 52 |
| Metformin Hclbrand: Metformin Hcl Er | 161 | 59 |
| Glimepiride | 133 | 41 |
| Atorvastatin Calcium | 131 | 48 |
| Pioglitazone Hcl | 124 | 52 |
| Dulaglutidebrand: Trulicity | 87 | 23 |
| Insulin Degludec |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$610 across 21 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
- 2006-05-27
- Last updated
- 2020-11-25
- Certified
- 2020-11-25
Frequently asked questions
- What is Ken Chiu's NPI number?
- Ken Chiu's National Provider Identifier (NPI) is 1639126691, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ken Chiu's specialty?
- Ken Chiu is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Ken Chiu located?
- Ken Chiu's practice location on file with NPPES is 1500 E Duarte Rd, Duarte, CA 91010.
- What is Ken Chiu's phone number?
- The practice phone number listed in the NPPES registry for Ken Chiu is (626) 359-8111.
- Does Ken Chiu accept Medicare?
- Ken Chiu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ken Chiu's NPI active?
- Yes — Ken Chiu's NPI (1639126691) is active in the NPPES registry as of the last update on 2020-11-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.