Mark S. Bostwick, MD
Internal Medicine Physician · Port Washington, WI
Mark S. Bostwick, MD is an internal medicine physician with a practice address in Port Washington, Wisconsin, and NPI 1487686614, issued on Jul 7, 2006. Check the license (Wisconsin 22296, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mark S. Bostwick
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 22296 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1777 W Grand Avenue, Port Washington, WI 53074
- Phone
- (262) 284-3456
- Enumerated
- Jul 7, 2006
- Record last updated
- Nov 24, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (262) 284-4543
- Medicaid ID
- 30397000 WI
- Entity
- Type 1 · individual
Also registered at 1777 W Grand Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Douglas McManus, MDInternal Medicine Physician1891727046
Verify Mark S. Bostwick in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 22296Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average internal medicine physician in 2024
9,158 Medicare Part D claims for 543 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 210 claims were for opioids.
Most prescribed
- Atorvastatin Calcium688 claims
- Losartan Potassium419 claims
- Amlodipine Besylate321 claims
- Lisinopril283 claims
- Levothyroxine Sodium273 claims
- Omeprazole217 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.
3 internal medicine physician records list a practice address in Port Washington
They are 3 of the 228 NPPES records with a practice address in Port Washington, and 2,078 internal medicine physician records in Wisconsin.
All 3 in Port Washington → All 2,078 in Wisconsin → Every provider in Port Washington →
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 Mark S. Bostwick, MD's NPI number?
Mark S. Bostwick, MD's National Provider Identifier (NPI) is 1487686614, issued on Jul 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark S. Bostwick, MD located?
The NPPES record lists a practice address at 1777 W Grand Avenue, Port Washington, WI, 53074. Phone: (262) 284-3456. Providers update this record themselves, so call before visiting.
How can I verify Mark S. Bostwick, MD's license?
NPPES lists Wisconsin license number 22296, 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 Mark S. Bostwick, MD prescribe under Medicare Part D?
In 2024, Mark S. Bostwick, MD had 9,158 Medicare Part D claims for 543 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.