Andrew Joseph Walker, M.D.
Gastroenterology Physician · Madison, WI
Andrew Joseph Walker, M.D. is a gastroenterology physician with a practice address in Madison, Wisconsin, and NPI 1649482605, issued on May 4, 2007. Check the license (Wisconsin 52357, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Andrew Joseph Walker
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 52357 WI
Self-reported in NPPES; status is on the state search - Practice location
- 700 S Park St Ste A, Madison, WI 53715
- Phone
- (608) 260-2900
- Enumerated
- May 4, 2007
- Record last updated
- Dec 15, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (608) 260-2977
- Medicaid ID
- 1649482605 WI
- Medicare enrollment
- Enrolled (PECOS I20140701001754); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 2007
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 340 in Wisconsin → Look up another NPI →
Also registered at 700 S Park St Ste A
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Andrew Joseph Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 52357Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average gastroenterology physician in 2024
705 Medicare Part D claims for 357 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Gavilyte-C206 claims
- Omeprazole100 claims
- Pantoprazole Sodium53 claims
- Creon34 claims
- Budesonide Dr33 claims
- Famotidine33 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.
Bills Medicare through one group practice
- Dean Health Systems IncMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrew Joseph Walker among 340 gastroenterology physician records in Wisconsin
Andrew Joseph Walker, M.D. is one of 340 gastroenterology physician records with a practice address in Wisconsin. 83% 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 56% of them.
- NPI issued2007 · 56% of these records are older, 36% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2007 · median 2003 among the 239 with a school on file
- Record last updated2020 · 52% 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Wisconsin
There are 340 gastroenterology physician records in Wisconsin.
All 340 in Wisconsin → Every provider in Madison → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Michael Allan, MDMadison, WI 537151558300822
- Siobhan Byrne, M.D.Madison, WI 537151417915836
- Abigail Christiansen, MDMadison, WI 537151427003227
- Sigurdur Einarsson, MDMadison, WI 537151245206317
- Jason Gonzaga, M.D.Madison, WI 537151710026430
- Gary Griglione, MDMadison, WI 537151013931203
- John Hamilton, MDMadison, WI 537151659310969
- Susan Lepinski, MDMadison, WI 537151780650713
Common questions
What is Andrew Joseph Walker, M.D.'s NPI number?
Andrew Joseph Walker, M.D.'s National Provider Identifier (NPI) is 1649482605, issued on May 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Andrew Joseph Walker, M.D. located?
The NPPES record lists a practice address at 700 S Park St Ste A, Madison, WI, 53715. Phone: (608) 260-2900. Providers update this record themselves, so call before visiting.
How can I verify Andrew Joseph Walker, M.D.'s license?
NPPES lists Wisconsin license number 52357, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrew Joseph Walker, M.D. prescribe under Medicare Part D?
In 2024, Andrew Joseph Walker, M.D. had 705 Medicare Part D claims for 357 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
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.