Dr. David Wei, M.D.
Emergency Medicine (Emergency Medicine Physician)
1601 Ygnacio Valley Rd
Walnut Creek, CA 94598
Who else practices at this address →
Contra Costa County includes mental health (19% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Northwestern University Feinberg Medical School (2007)
- Years since graduation
- 19
- In the NPI registry since
- 2007
- Medicare patients seen, 2024
- 790
Licensed in California since 2010, according to the Medical Board of California. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2007Medical school: Northwestern University Feinberg Medical School
- 2007Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Emergency Medicine Physician primary
CA license A112876 (first issued 2010; current) -
General Practice Physician
CA license A112876 (first issued 2010; current)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- John Muir Medical Center - Walnut Creek Campus Walnut Creek, CA
- John Muir Medical Center - Concord Campus Concord, CA
- San Ramon Regional Medical Center San Ramon, CA
Medical groups
- Cep America - California (1,292 clinicians)
- Medamerica Physician Solutions PC (28 clinicians)
- Cep America - Auc PC (16 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 790
- Services billed
- 1,748
- Patients’ average age
- 77
| Service | Times | Patients |
|---|---|---|
| Emergency department visit with high level of medical decision making | 406 | 398 |
| Removal of skin and tissue, 20.0 sq cm or less | 276 | 114 |
| Established patient office or other outpatient visit, 20-29 minutes | 169 | 81 |
| Emergency department visit with moderate level of medical decision making | 124 | 122 |
| Established patient office or other outpatient visit, 30-39 minutes | 116 | 74 |
| Removal of skin and tissue, each additional 20.0 sq cm or less | 65 | 20 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 64 | 63 |
| Removal of tissue from wound, 20.0 sq cm or less | 56 | 34 |
| Critical care, first 30-74 minutes | 47 | 47 |
| Application of chemical to stop tissue regrowth in wound | 28 | 23 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Cephalexin Other prescribers in Walnut Creek, CA | 35 |
| Hydrocodone-Acetaminophen (hydrocodone/acetaminophen) Other prescribers in Walnut Creek, CA | 20 |
| Doxycycline Hyclate Other prescribers in Walnut Creek, CA | 14 |
| Amoxicillin-Clavulanate Potass (amoxicillin/potassium clav) Other prescribers in Walnut Creek, CA | 12 |
| Santyl (collagenase clostridium hist.) | 12 |
| Prednisone Other prescribers in Walnut Creek, CA | 11 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 6 companies reported 6 payments worth $355 in total to this clinician.
| Convatec Inc. | $150 |
|---|---|
| Kerecis Limited | $83.46 |
| Smith+nephew, Inc. | $46.16 |
| Organogenesis Inc. | $32.70 |
| Solventum Corporation | $25.57 |
| Urgo Medical North America, LLC | $17.21 |
| Food and Beverage | $355 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.