Ku-Juey Raymond Chang, M.D.
NPI 1689611337 · Endocrinology, Diabetes & Metabolism Physician · Lake Forest, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ku-Juey Raymond Chang, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Lake Forest, CA (NPI 1689611337).
Provider details
- NPI number
- 1689611337
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G181497 (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
22,061 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) |
|---|---|---|
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 941 | $67 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 848 | $9 |
| Blood Test, Basic Group of Blood Chemicals (calcium, Total)80048 | 835 | $8 |
| Phosphate Level84100 | 827 | $5 |
| Magnesium Level83735 | 826 | $7 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 824 | $138 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 63 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 375 | 111 |
| Levothyroxine Sodium | 361 | 97 |
| Empagliflozinbrand: Jardiance | 326 | 76 |
| Levothyroxine Sodiumbrand: Synthroid | 243 | 68 |
| Tirzepatidebrand: Mounjaro | 195 | 30 |
| Finerenonebrand: Kerendia | 185 | 33 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$87,420 across 222 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
- 2006-06-01
- Last updated
- 2015-12-02
Frequently asked questions
- What is Ku-Juey Raymond Chang's NPI number?
- Ku-Juey Raymond Chang's National Provider Identifier (NPI) is 1689611337, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ku-Juey Raymond Chang's specialty?
- Ku-Juey Raymond Chang is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Ku-Juey Raymond Chang located?
- Ku-Juey Raymond Chang's practice location on file with NPPES is 23331 El Toro Rd, Lake Forest, CA 92630-4891.
- What is Ku-Juey Raymond Chang's phone number?
- The practice phone number listed in the NPPES registry for Ku-Juey Raymond Chang is (949) 916-9100.
- Does Ku-Juey Raymond Chang accept Medicare?
- Ku-Juey Raymond Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ku-Juey Raymond Chang's NPI active?
- Yes — Ku-Juey Raymond Chang's NPI (1689611337) is active in the NPPES registry as of the last update on 2015-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.