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Edit this profileAt a glance
- 100 South Ellsworth Avenue, Suite 507, San Mateo, CA 94401
About Dr. Onuma
Listed in the NPI registry as a specialist, Edward K. Onuma, M.D., PhD practices in San Mateo, CA. Edward graduated from State University of Ny Upstate Medical University in 1990. According to Medicare claims data, Edward cared for 733 Medicare patients across 788 services. The services billed most often include biopsy of large bowel using a flexible endoscope, new patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. NPI 1477559722 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (650) 342-7432
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
100 SOUTH ELLSWORTH AVENUE SUITE 507
San Mateo, CA 94401
Procedures Most Often Billed to Medicare
788 services · 733 patients · 11 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
156 | More than most peers in Specialist |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
93 | More often than most peers in Specialist |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
82 | More often than most peers in Specialist |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
146 | More than most peers in Specialist |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
133 | As often as other peers in Specialist |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
57 | Less often than most peers in Specialist |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
31 | As often as other peers in Specialist |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
30 | As often as other peers in Specialist |
| Colorectal cancer screening; colonoscopy on individual at high risk | Billing code | G0105 |
29 | As often as other peers in Specialist |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
19 | Less often than most peers in Specialist |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other specialists in San Mateo 7
Same specialty, same city.
More connections — 23 related providers in 3 groups
Trained at State University of Ny Upstate Medical University 8
Other providers in the same specialty who trained at the same institution.
Class of 1990 at State University of Ny Upstate Medical University 8
Providers who graduated from the same medical school in the same year.
Also performs Biopsy of large bowel using a flexible endoscope 7
Providers in CA who bill this service to Medicare most often.
Common questions
What does Dr. Onuma specialize in?
Dr. Onuma is a specialist in San Mateo, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Dr. Onuma located?
Dr. Onuma is listed at 100 South Ellsworth Avenue Suite 507, San Mateo, CA 94401. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Onuma's phone number?
The number on file is (650) 342-7432. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Onuma's NPI number?
Dr. Onuma's National Provider Identifier is 1477559722. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Onuma go to medical school?
Dr. Onuma attended State University of Ny Upstate Medical University, graduating in 1990. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Onuma been practicing?
Dr. Onuma has 36 years experience. Calculated from a graduation year of 1990, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Onuma do most often?
According to Medicare billing data, Dr. Onuma performs procedures including biopsy of large bowel using a flexible endoscope, biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope and removal of polyps or growths of large bowel using an endoscope with mechanical snare, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Onuma confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Onuma. If this is you, claiming it is free.
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