Physician Profile
William Oh, M.D.
Unclaimed ProfileAbout Dr. Oh
Based in Irvine, CA, William Oh, M.D. is listed in the NPI registry under colon & rectal surgery. Medicare claims data shows William provided 146 services to 122 patients. The services billed most often include new patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more, subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes, and initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
Source: NPPES NPI Registry
Contact Information
- (949) 557-0370
- Email not available
Practice Locations
16405 SAND CANYON AVE STE 280
Irvine, CA 92618
Procedures Most Often Billed to Medicare
146 services · 122 patients · 6 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Diagnostic exam of anus using an endoscope | Procedure | 46600 |
14 |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
56 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
31 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
17 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
16 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
12 |
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 colorectal surgeons at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 2
Clinically related specialties at the same address — the people this provider most likely works alongside.
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.
More connections — 29 related providers in 4 groups
Other colorectal surgeons in Irvine 5
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2013 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Diagnostic exam of anus using an endoscope 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is William Oh?
William Oh is a colorectal surgeon in Irvine, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Colon & Rectal Surgery”.
NPI registry
What is William Oh's address?
William Oh is listed at 16405 Sand Canyon Ave Ste 280, Irvine, CA 92618. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with William Oh?
The number on file is (949) 557-0370. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for William Oh?
William Oh's National Provider Identifier is 1598100323. 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 William Oh train?
William Oh attended Other, graduating in 2013. This comes from the CMS National Downloadable File.
CMS public data
How much experience does William Oh have?
William Oh has 13 years experience. Calculated from a graduation year of 2013, reported in the CMS National Downloadable File.
CMS public data
What procedures does William Oh perform?
According to Medicare billing data, William Oh performs procedures including diagnostic exam of anus using an endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is William Oh's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by William Oh. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.