Anna Chang, M.D.
NPI 1568402931 · Internal Medicine Physician · Concord, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Anna Chang, M.D. is a Internal Medicine Physician provider in Concord, CA (NPI 1568402931).
Provider details
- NPI number
- 1568402931
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A69618 (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
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
2,057 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) |
|---|---|---|
| Diabetes Outpatient Self-Management Training Services, Individual, Per 30 MinutesG0108 | 706 | $65 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 502 | $152 |
| Hemoglobin A1c Level83036 | 193 | $9 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 | 172 | $39 |
| 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 | 170 | $19 |
| Diabetes Outpatient Self-Management Training Services, Group Session (2 Or More), Per 30 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 43 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 426 | 111 |
| Metformin Hcl | 239 | 71 |
| Empagliflozinbrand: Jardiance | 215 | 52 |
| Semaglutidebrand: Ozempic | 185 | 41 |
| Tirzepatidebrand: Mounjaro | 126 | 26 |
| Atorvastatin Calcium | 109 | 32 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$447 across 16 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
- 2006-06-07
- Last updated
- 2012-06-18
Frequently asked questions
- What is Anna Chang's NPI number?
- Anna Chang's National Provider Identifier (NPI) is 1568402931, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Anna Chang's specialty?
- Anna Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Anna Chang located?
- Anna Chang's practice location on file with NPPES is 2700 Grant St, Concord, CA 94520-2266.
- What is Anna Chang's phone number?
- The practice phone number listed in the NPPES registry for Anna Chang is (925) 687-8860.
- Does Anna Chang accept Medicare?
- Anna Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Anna Chang's NPI active?
- Yes — Anna Chang's NPI (1568402931) is active in the NPPES registry as of the last update on 2012-06-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.