Brian Joseph McGuinness, M.D.
Colon & Rectal Surgery Physician · Walnut Creek, CA
Brian Joseph McGuinness, M.D. is a colon & rectal surgery physician with a practice address in Walnut Creek, California, and NPI 1891870770, issued on Oct 26, 2006. Check the license (California A83195, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian Joseph McGuinness
- Credential
- M.D.
- Primary taxonomy
- Colon & Rectal Surgery Physician 208C00000X
- License number
- A83195 CA
Self-reported in NPPES; status is on the state search - Practice location
- 365 Lennon LN, Walnut Creek, CA 94598
- Phone
- (925) 274-9000
- Enumerated
- Oct 26, 2006
- Record last updated
- Feb 26, 2025
- Fax
- (925) 274-9004
- Medicare enrollment
- Enrolled (PECOS I20090206000418); may accept Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest colon & rectal surgery physician records → All 198 in California → Look up another NPI →
Also registered at 365 Lennon LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Brian Joseph McGuinness in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A83195Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average colon & rectal surgery physician in 2024
119 Medicare Part D claims for 63 beneficiaries, against an average of 192 among the 1,836 providers of this specialty who prescribed in Part D. 31 claims were for opioids.
Most prescribed
- Oxycodone-Acetaminophen13 claims
- Sod Sulf-Potass Sulf-Mag Sulf13 claims
- Tramadol Hcl13 claims
- Celecoxib12 claims
- Gabapentin11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 80.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $331.75
9 payments; by number, the most common kind was food and beverage; the largest payer was Solventum Corporation. The 1,524 providers of this specialty with any payment received $3,468.16 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Bass Medical GroupAlamo, CA
- John Muir Trauma Physicians Billing ServiceWalnut Creek, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian Joseph McGuinness among 198 colon & rectal surgery physician records in California
Brian Joseph McGuinness, M.D. is one of 198 colon & rectal surgery physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 57% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 75% of these records are
- Graduated1995 · median 2002 among the 149 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208C00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Colon & Rectal Surgery Physician providers in California
There are 198 colon & rectal surgery physician records in California.
All 198 in California → Every provider in Walnut Creek → Colon & Rectal Surgery Physician nationwide →
The 8 colon & rectal surgery physician records with the nearest ZIP codes
- Piyush Aggarwal, MDWalnut Creek, CA 945981700070273
- Ran Kim, M.D.Walnut Creek, CA 945981437237005
- Poornima Vanguri, MDWalnut Creek, CA 945981144457375
- Ahmed Alkoraishi, MDHayward, CA 945451609954478
- Doreen Jackson, MDTravis Air Force Base, CA 945351649615287
- Mark Scherrer, MDTravis Afb, CA 945351487641155
- Kim Rhoads, MDStanford, CA 943051720266539
- Andrew Shelton, M.D.Stanford, CA 943051710029681
Common questions
What is Brian Joseph McGuinness, M.D.'s NPI number?
Brian Joseph McGuinness, M.D.'s National Provider Identifier (NPI) is 1891870770, issued on Oct 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brian Joseph McGuinness, M.D. located?
The NPPES record lists a practice address at 365 Lennon LN, Walnut Creek, CA, 94598. Phone: (925) 274-9000. Providers update this record themselves, so call before visiting.
How can I verify Brian Joseph McGuinness, M.D.'s license?
NPPES lists California license number A83195, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Brian Joseph McGuinness, M.D. prescribe under Medicare Part D?
In 2024, Brian Joseph McGuinness, M.D. had 119 Medicare Part D claims for 63 beneficiaries; the average among colon & rectal surgery physician prescribers was 192. Part D covers Medicare prescriptions only.
What is Brian Joseph McGuinness, M.D.'s MIPS final score?
The 2023 MIPS final score is 80.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.