James M. Chapman, M.D.
Internal Medicine Physician · Muskego, WI
James M. Chapman, M.D. is an internal medicine physician with a practice address in Muskego, Wisconsin, and NPI 1073586913, issued on Feb 10, 2006. Check the license (Wisconsin 38828, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- James M. Chapman
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 38828 WI
Self-reported in NPPES; status is on the state search - Practice location
- S69 W15636 Janesville Road, Muskego, WI 53150
- Phone
- (262) 928-7000
- Enumerated
- Feb 10, 2006
- Record last updated
- Nov 3, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (414) 422-2075
- Medicaid ID
- 32328800 WI
- Medicare enrollment
- Enrolled (PECOS I20100607000388); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1994
- Entity
- Type 1 · individual
Also registered at S69 W15636 Janesville Road
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Daniel Cheng, M.D.Internal Medicine Physician1912970781
- Carrie Lapow, APNPPediatric Nurse Practitioner1174596795
- Steven Mamerow, M.D.Internal Medicine Physician1194798025
Verify James M. Chapman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 38828Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,722 Medicare Part D claims for 698 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 78 claims were for opioids.
Most prescribed
- Atorvastatin Calcium669 claims
- Amlodipine Besylate337 claims
- Lisinopril320 claims
- Losartan Potassium298 claims
- Pantoprazole Sodium254 claims
- Levothyroxine Sodium249 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
- Prohealth Medical Group IncWaterford, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
6 internal medicine physician records list a practice address in Muskego
They are 6 of the 192 NPPES records with a practice address in Muskego, and 2,078 internal medicine physician records in Wisconsin.
All 6 in Muskego → All 2,078 in Wisconsin → Every provider in Muskego →
Other internal medicine physician records in Wisconsin
- Sheetal Aatrai, MDMarshfield, WI1417568965
- Khalid Abdelgadir, MDManitowoc, WI1407433295
- Mesfin Abdissa, MDMilwaukee, WI1376579417
- Anas Abed, MDMadison, WI1659002566
- Margaret Abel, MDRhinelander, WI1477590487
- Mesfin Abera, M.D.Beaver Dam, WI1972852390
- Vidthya Abraham, M.D.Madison, WI1861836058
- Ismael Abu Limon, MDGreenfield, WI1467945543
- Amjed Abu Muhanna, MDMarinette, WI1861514135
- Satish Achanti, MDAppleton, WI1982711198
Common questions
What is James M. Chapman, M.D.'s NPI number?
James M. Chapman, M.D.'s National Provider Identifier (NPI) is 1073586913, issued on Feb 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James M. Chapman, M.D. located?
The NPPES record lists a practice address at S69 W15636 Janesville Road, Muskego, WI, 53150. Phone: (262) 928-7000. Providers update this record themselves, so call before visiting.
How can I verify James M. Chapman, M.D.'s license?
NPPES lists Wisconsin license number 38828, 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 James M. Chapman, M.D. prescribe under Medicare Part D?
In 2024, James M. Chapman, M.D. had 6,722 Medicare Part D claims for 698 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.