John Walker McDonald, M.D.
Gastroenterology Physician · Baton Rouge, LA
John Walker McDonald, M.D. is a gastroenterology physician with a practice address in Baton Rouge, Louisiana, and NPI 1386834281, issued on Jul 26, 2007. Check the license (Louisiana MD.200458, as entered in NPPES) on the Louisiana State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John Walker McDonald
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- MD.200458 LA
Self-reported in NPPES; status is on the state search - Practice location
- 9103 Jefferson Hwy, Baton Rouge, LA 70809
- Phone
- (225) 927-1190
- Enumerated
- Jul 26, 2007
- Record last updated
- Nov 7, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (225) 706-0160
- Medicare enrollment
- Enrolled (PECOS I20100805000190); accepts Medicare assignment
- Medical or professional school
- Louisiana State University School Of Medicine In Shreveport, 2004
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 263 in Louisiana → Look up another NPI →
Also registered at 9103 Jefferson Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Satyaprasad Alapati, M.D.Gastroenterology Physician1679549695
- William Anderson, M.D.Gastroenterology Physician1598730707
- Kathryn Baker, PAMedical Physician Assistant1669753216
- Nicholas BaldwinGastroenterology Physician1013413327
- Michael Barker, MDGastroenterology Physician1750701355
- Robert Be, M.D.Gastroenterology Physician1417923970
Verify John Walker McDonald in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersLouisiana State Board of Medical Examiners
Search for license MD.200458Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% more Medicare Part D claims than the average gastroenterology physician in 2024
1,520 Medicare Part D claims for 481 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium408 claims
- Dicyclomine Hcl148 claims
- Linzess118 claims
- Omeprazole92 claims
- Sod Sulf-Potass Sulf-Mag Sulf67 claims
- Esomeprazole Magnesium58 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): 79.9 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: $847.46
45 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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
- Lsuhn Billing LLCLafayette, LA
- Texas Digestive Disease Consultants, PLLCThibodaux, LA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Walker McDonald among 263 gastroenterology physician records in Louisiana
John Walker McDonald, M.D. is one of 263 gastroenterology physician records with a practice address in Louisiana. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 54% of them.
- NPI issued2007 · 54% of these records are older, 35% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 79% of these records are
- Graduated2004 · median 2004 among the 207 with a school on file
- Record last updated2014 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Louisiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Louisiana
There are 263 gastroenterology physician records in Louisiana.
All 263 in Louisiana → Every provider in Baton Rouge → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Satyaprasad Alapati, M.D.Baton Rouge, LA 708091679549695
- William Anderson, M.D.Baton Rouge, LA 708091598730707
- Robert Be, M.D.Baton Rouge, LA 708091417923970
- Charles Berggreen, MDBaton Rouge, LA 708091033183769
- Christopher Christensen, M.D.Baton Rouge, LA 708091295787802
- Gregory Fusilier, M.D.Baton Rouge, LA 708091003881616
- George Howard, MDBaton Rouge, LA 708091942234828
- Ronald Leo, M.D.Baton Rouge, LA 708091295700623
Common questions
What is John Walker McDonald, M.D.'s NPI number?
John Walker McDonald, M.D.'s National Provider Identifier (NPI) is 1386834281, issued on Jul 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Walker McDonald, M.D. located?
The NPPES record lists a practice address at 9103 Jefferson Hwy, Baton Rouge, LA, 70809. Phone: (225) 927-1190. Providers update this record themselves, so call before visiting.
How can I verify John Walker McDonald, M.D.'s license?
NPPES lists Louisiana license number MD.200458, as entered by the provider. Search the Louisiana State Board of Medical Examiners at https://www.lsbme.la.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Walker McDonald, M.D. prescribe under Medicare Part D?
In 2024, John Walker McDonald, M.D. had 1,520 Medicare Part D claims for 481 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is John Walker McDonald, M.D.'s MIPS final score?
The 2023 MIPS final score is 79.9 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.