Diana Chang
NPI 1396142386 · Endocrinology, Diabetes & Metabolism Physician · Ventura, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diana Chang is a Endocrinology, Diabetes & Metabolism Physician provider in Ventura, CA (NPI 1396142386).
Provider details
- NPI number
- 1396142386
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- Yes
- License
- A154454 (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
11 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
1,509 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 | 372 | $138 |
| 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 | 352 | $17 |
| Blood Glucose (sugar) Level82947 | 161 | $4 |
| Hemoglobin A1c Level83036 | 160 | $9 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 135 | $195 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metformin Hclbrand: Metformin Hcl Er | 264 | 87 |
| Levothyroxine Sodium | 213 | 63 |
| Tirzepatidebrand: Mounjaro | 211 | 38 |
| Empagliflozinbrand: Jardiance | 159 | 40 |
| Semaglutidebrand: Ozempic | 146 | 30 |
| Dulaglutidebrand: Trulicity |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$47 across 1 record (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
- 2014-11-19
- Last updated
- 2021-07-08
- Certified
- 2021-07-08
Frequently asked questions
- What is Diana Chang's NPI number?
- Diana Chang's National Provider Identifier (NPI) is 1396142386, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Chang's specialty?
- Diana Chang is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Diana Chang located?
- Diana Chang's practice location on file with NPPES is 6633 Telephone Rd Ste 200, Ventura, CA 93003-5569.
- What is Diana Chang's phone number?
- The practice phone number listed in the NPPES registry for Diana Chang is (805) 642-8252.
- Does Diana Chang accept Medicare?
- Diana Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diana Chang's NPI active?
- Yes — Diana Chang's NPI (1396142386) is active in the NPPES registry as of the last update on 2021-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.