Physician Profile
Brian J. McGuinness, M.D.
Unclaimed ProfileAbout Dr. Mcguinness
Based in Walnut Creek, CA, Brian J. McGuinness, M.D. is listed in the NPI registry under colon & rectal surgery. Brian graduated from Tulane University School of Medicine in 1995. According to Medicare claims data, Brian cared for 342 Medicare patients across 403 services. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, diagnostic exam of anus using an endoscope, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more.
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
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
- (925) 274-9000
- Email not available
Practice Locations
365 LENNON LN STE. 290
Walnut Creek, CA 94598
Procedures Most Often Billed to Medicare
403 services · 342 patients · 11 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Diagnostic exam of anus using an endoscope | Procedure | 46600 |
69 | More often than most peers in Colon & Rectal Surgery |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
17 | As often as other peers in Colon & Rectal Surgery |
| Diagnostic exam of rectum and lower large bowel using an endoscope | Procedure | 45300 |
12 | |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
75 | More often than most peers in Colon & Rectal Surgery |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
42 | More often than most peers in Colon & Rectal Surgery |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
40 | More often than most peers in Colon & Rectal Surgery |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
38 | More often than most peers in Colon & Rectal Surgery |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
36 | More often than most peers in Colon & Rectal Surgery |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
36 | As often as other peers in Colon & Rectal Surgery |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
22 |
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.
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 colorectal surgeons in Walnut Creek 3
Same specialty, same city.
Trained at Tulane University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1995 at Tulane University School of Medicine 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 is Brian J. McGuinness's specialty?
Brian J. McGuinness is a colorectal surgeon in Walnut Creek, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Colon & Rectal Surgery”.
NPI registry
Where can I find Brian J. McGuinness?
Brian J. McGuinness is listed at 365 Lennon Ln Ste. 290, Walnut Creek, CA 94598. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Brian J. McGuinness?
The number on file is (925) 274-9000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Brian J. McGuinness's NPI number?
Brian J. McGuinness's National Provider Identifier is 1891870770. 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
What is Brian J. McGuinness's education?
Brian J. McGuinness attended Tulane University School of Medicine, graduating in 1995. This comes from the CMS National Downloadable File.
CMS public data
How long has Brian J. McGuinness been practicing?
Brian J. McGuinness has 31 years experience. Calculated from a graduation year of 1995, reported in the CMS National Downloadable File.
CMS public data
What is Brian J. McGuinness known for?
According to Medicare billing data, Brian J. McGuinness performs procedures including diagnostic exam of anus using an endoscope, biopsy of large bowel using a flexible endoscope and diagnostic exam of rectum and lower large bowel using an endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Brian J. McGuinness confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Brian J. McGuinness. 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.