Dr. Christopher Aoki, M.D.
Gastroenterology (Gastroenterology Physician)
- Medicare participating
At a glance
- Medical school
- University of Hawaii John A. Burns School of Medicine (2001)
- Years since graduation
- 25
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 293
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
- 2001Medical school: University of Hawaii John A. Burns 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
-
Gastroenterology Physician primary
HI license 14000 · CA license A80649
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- The Queens Medical Center Honolulu, HI
- North Hawaii Community Hospital, Inc Kamuela, HI
Medical groups
- The Queens Medical Center (192 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
- 293
- Services billed
- 626
- Patients’ average age
- 75
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 20-29 minutes | 161 | 133 |
| Established patient office or other outpatient visit, 30-39 minutes | 158 | 89 |
| New patient office or other outpatient visit, 30-44 minutes | 69 | 69 |
| Biopsy of large bowel using a flexible endoscope | 59 | 58 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 52 | 51 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 48 | 48 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 14 | 14 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 13 | 13 |
| New patient office or other outpatient visit, 45-59 minutes | 12 | 12 |
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 |
|---|---|
| Omeprazole Other prescribers in Sacramento, CA | 128 |
| Carvedilol Other prescribers in Sacramento, CA | 106 |
| Pantoprazole Sodium Other prescribers in Sacramento, CA | 80 |
| Peg 3350-Electrolyte (sodium chloride/nahco3/kcl/peg) | 76 |
| Famotidine Other prescribers in Sacramento, CA | 50 |
| Ursodiol Other prescribers in Sacramento, CA | 34 |
| Mesalamine Other prescribers in Sacramento, CA | 31 |
| Azathioprine Other prescribers in Sacramento, CA | 27 |
| Furosemide Other prescribers in Sacramento, CA | 24 |
| Spironolactone Other prescribers in Sacramento, CA | 20 |
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, 14 companies reported 82 payments worth $1,839 in total to this clinician.
| Janssen Biotech, Inc. | $398 |
|---|---|
| AbbVie Inc. | $395 |
| Gilead Sciences, Inc. | $311 |
| Madrigal Pharmaceuticals | $218 |
| Takeda Pharmaceuticals U.S.A., Inc. | $200 |
| Celltrion USA Inc. | $60.28 |
| Ipsen Biopharmaceuticals, Inc | $55.03 |
| Pfizer Inc. | $54.84 |
| Food and Beverage | $1,740 |
|---|---|
| Education | $99.00 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Janssen Biotech, Inc. May 29, 2025 | Education TREMFYA · Immunology · in-kind | $99.00 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
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.