Dr. Mark Z. Chen, M.D.
Radiology (Diagnostic Radiology Physician)
- Medicare participating
At a glance
- Medical school
- University of California, Geffen School of Medicine (1995)
- Years since graduation
- 31
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 4,732
Licensed in California since 1996, 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
- 1995Medical school: University of California, Geffen School of Medicine
- 2006Registered 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
-
Diagnostic Radiology Physician primary
CA license A61010 (first issued 1996; current)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Uci Health-Orange Orange, CA
- Hoag Memorial Hospital Presbyterian Newport Beach, CA
- Hoag Orthopedic Institute Irvine, CA
Medical groups
- Newport Harbor Radiology Associates Medical Group Inc (70 clinicians)
- Newport Center Radiology Associates Medical Group Inc (59 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
- 4,732
- Services billed
- 8,559
- Patients’ average age
- 77
| Service | Times | Patients |
|---|---|---|
| X-ray of chest, 1 view | 777 | 675 |
| Ct scan head or brain without contrast | 472 | 437 |
| X-ray of chest, 2 views | 408 | 404 |
| Mri scan of brain before and after contrast | 362 | 343 |
| Mri scan of brain without contrast | 251 | 250 |
| Nuclear medicine study from skull base to mid-thigh with ct scan | 246 | 233 |
| Ct scan of abdomen and pelvis with contrast | 178 | 171 |
| X-ray of abdomen, 1 view | 171 | 152 |
| Mri scan of lower spinal canal without contrast | 165 | 165 |
| Ct scan of chest without contrast | 152 | 152 |
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.
Payments from drug and device companies
In 2025, 2 companies reported 5 payments worth $99.62 in total to this clinician.
| Paratek Pharmaceuticals, Inc. | $75.76 |
|---|---|
| Kerecis Limited | $23.86 |
| Food and Beverage | $99.62 |
|---|
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.