Dr. Jefferson W. Chen, MD PHD
Neurosurgery (Neurological Surgery Physician)
- Medicare participating
At a glance
- Medical school
- Johns Hopkins University School of Medicine (1987)
- Years since graduation
- 39
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 198
Licensed in California since 1988, 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
- 1987Medical school: Johns Hopkins University School of Medicine
- 2005Registered 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
-
Neurological Surgery Physician primary
CA license A45489 (first issued 1988; current) · AZ license 21671 · OR license MD21924 · TX license J6902 (first issued 1994; canc non-renewal)
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
Medical groups
- Regents of the University of California (27 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
- 198
- Services billed
- 656
- Patients’ average age
- 73
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 134 | 80 |
| Established patient office or other outpatient visit, 20-29 minutes | 66 | 49 |
| Reprogramming of cerebrospinal fluid shunt | 48 | 31 |
| Established patient office or other outpatient visit, 40-54 minutes | 40 | 31 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 32 | 22 |
| New patient office or other outpatient visit, 60-74 minutes | 25 | 25 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 24 | 24 |
| Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | 21 | 19 |
| New patient office or other outpatient visit, 45-59 minutes | 16 | 16 |
| Creation of brain fluid drainage shunt, ventriculo-peritoneal, -pleural, other terminus | 15 | 15 |
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, 1 companies reported 2 payments worth $53.48 in total to this clinician.
| Clearpoint Neuro, Inc. | $53.48 |
|---|
| Food and Beverage | $53.48 |
|---|
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.
Industry-funded research
Named as a principal investigator on 1 industry-funded study in 2025, from 1 company. The companies reported $7,822 in research payments for these studies, mostly to the institutions running them.
- A Phase 2a, Randomized, Double-blind, Placebo-controlled Study to Assess the Efficacy and Safety of MT-3921 in Subjects with Acute Traumatic Cervical Spinal Cord Injury
Tanabe Pharma America, Inc.
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.