Dr. John K. Chia, MD
Infectious Disease (Infectious Disease Physician)
23430 Hawthorne Blvd Ste 200
Torrance, CA 90505
Who else practices at this address →
Los Angeles County includes primary care (7% of residents) and mental health (13% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- University of California, Geffen School of Medicine (1979)
- Years since graduation
- 47
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 207
Licensed in California since 1980, 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
- 1979Medical 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
-
Infectious Disease Physician primary
CA license G43168 (first issued 1980; current) -
Internal Medicine Physician
CA license G43168 (first issued 1980; current)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Torrance Memorial Medical Center Torrance, CA
Medical groups
- Id Med A Medical Corporation (5 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
- 207
- Services billed
- 605
- Patients’ average age
- 68
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 307 | 182 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 306 | 71 |
| Established patient office or other outpatient visit, 40-54 minutes | 125 | 90 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 88 | 62 |
| Insertion of needle into vein for collection of blood sample | 48 | 45 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 45 | 45 |
| New patient office or other outpatient visit, 60-74 minutes | 24 | 24 |
| Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | 18 | 13 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 14 | 14 |
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 |
|---|---|
| Fluvoxamine Maleate Other prescribers in Torrance, CA | 113 |
| Acyclovir Other prescribers in Torrance, CA | 109 |
| Paxlovid (nirmatrelvir/ritonavir) Other prescribers in Torrance, CA | 99 |
| Aripiprazole Other prescribers in Torrance, CA | 55 |
| Lamivudine | 54 |
| Valacyclovir (valacyclovir hcl) Other prescribers in Torrance, CA | 51 |
| Gabapentin Other prescribers in Torrance, CA | 46 |
| Famotidine Other prescribers in Torrance, CA | 44 |
| Tramadol Hcl Other prescribers in Torrance, CA | 38 |
| Oseltamivir Phosphate Other prescribers in Torrance, CA | 38 |
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, 1 companies reported 1 payments worth $19.78 in total to this clinician.
| Shionogi Inc | $19.78 |
|---|
| Food and Beverage | $19.78 |
|---|
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.