Ian Grimes, M.D.
Gastroenterology Physician · Madison, WI
Ian Grimes, M.D. is a gastroenterology physician with a practice address in Madison, Wisconsin, and NPI 1275737165, issued on Jun 13, 2007. Check the license (Wisconsin 52636, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Ian Grimes
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 52636 WI
Self-reported in NPPES; status is on the state search - Practice location
- 750 University Row, Madison, WI 53705
- Phone
- (608) 890-5000
- Enumerated
- Jun 13, 2007
- Record last updated
- Jan 27, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110309000726); accepts Medicare assignment
- Medical or professional school
- Southern Illinois 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 750 University Row
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Parul Agarwal, M.D.Hepatology Physician1518925965
- Julia Berian, M.D.Colon & Rectal Surgery Physician1740576339
- Antonio Bosch, MDGastroenterology Physician1295743656
- Nicole Boschuetz, M.D.Hepatology Physician1033506910
- Margaret BozdechPhysician Assistant1568027894
- Randall Brown, MDFamily Medicine Physician1376508481
Verify Ian Grimes in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 52636Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
About as many Medicare Part D claims as the average gastroenterology physician in 2024
815 Medicare Part D claims for 307 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Gavilyte-C199 claims
- Humira(Cf) Pen93 claims
- Azathioprine46 claims
- Mesalamine46 claims
- Pantoprazole Sodium35 claims
- Diphenoxylate-Atropine34 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
- University OF Wisconsin Medical Foundation IncMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ian Grimes among 340 gastroenterology physician records in Wisconsin
Ian Grimes, 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 updated2021 · 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
- Antonio Bosch, MDMadison, WI 537051295743656
- Freddy Caldera, D.O.Madison, WI 537051255594537
- Matthew Caldis, M.D., M.S.Madison, WI 537051922461029
- Rodrigo Castillo, MDMadison, WI 537051811007305
- Megan LutzMadison, WI 537051306232863
- Gregory Nelligan, M.D.Madison, WI 537051205924842
- Vinay Patel, M.D.Madison, WI 537051639583750
- Mark Reichelderfer, MDMadison, WI 537051699736512
Common questions
What is Ian Grimes, M.D.'s NPI number?
Ian Grimes, M.D.'s National Provider Identifier (NPI) is 1275737165, issued on Jun 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ian Grimes, M.D. located?
The NPPES record lists a practice address at 750 University Row, Madison, WI, 53705. Phone: (608) 890-5000. Providers update this record themselves, so call before visiting.
How can I verify Ian Grimes, M.D.'s license?
NPPES lists Wisconsin license number 52636, 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 Ian Grimes, M.D. prescribe under Medicare Part D?
In 2024, Ian Grimes, M.D. had 815 Medicare Part D claims for 307 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.