Anna R. Chang, M.D.
NPI 1568402931ActiveIndividual· Internal Medicine· Concord, CA
Internal Medicine (M.D.) in Concord, California, trained at University of California, San Diego School of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $1,489,573 for 3,007 claims, against $197,170 paid for services in 2024. Novo Nordisk Inc was the largest of 11 companies reporting payments in 2025, $984.12 in all, mostly food and beverage.
Overview
| NPI | 1568402931 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 7, 2006 |
| Last updated in NPPES | Jun 18, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A69618 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 671 |
|---|---|
| Services billed | 8,701 across 23 procedure codes |
| Paid by Medicare | $197,170 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,007 · 7,664 30-day fills |
|---|---|
| Patients | 347 |
| Total drug cost | $1,489,573 |
| Generic share | 51% of claims |
Education and affiliations
| Medical school | University of California, San Diego School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- John Muir Physician NetworkPleasant Hill, CA · 494 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Industry payments (Open Payments)
- 2025$984.12 · 37 payments from 11 companies
- 2024$446.61 · 16 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $271.78 | 9 |
| Dexcom, Inc. | $214.17 | 3 |
| Amgen Inc. | $199.71 | 12 |
| Sequel Med Tech, LLC | $71.40 | 3 |
| Abbott Laboratories | $61.12 | 3 |
What the 2025 payments were for
- Food and Beverage$984.12 · 37 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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