Steven G. Hammer, M.D.
Family Medicine Physician · Mukwonago, WI
Steven G. Hammer, M.D. is a family medicine physician with a practice address in Mukwonago, Wisconsin, and NPI 1134192198, issued on Feb 9, 2006. Check the license (Wisconsin 26218, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Steven G. Hammer
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 26218 WI
Self-reported in NPPES; status is on the state search - Practice location
- 240 W. Maple Ave, Mukwonago, WI 53149
- Phone
- (262) 928-1900
- Enumerated
- Feb 9, 2006
- Record last updated
- Nov 2, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (262) 363-1949
- Medicaid ID
- 30598700 WI
- Medicare enrollment
- Enrolled (PECOS I20041129000824); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1983
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Verify Steven G. Hammer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 26218Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average family medicine physician in 2024
296 Medicare Part D claims for 224 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Doxycycline Monohydrate75 claims
- Amoxicillin-Clavulanate Potass33 claims
- Mupirocin29 claims
- Prednisone25 claims
- Sulfamethoxazole-Trimethoprim20 claims
- Cefdinir11 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 IncWaukesha, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Steven G. Hammer among 3,765 family medicine physician records in Wisconsin
Steven G. Hammer, M.D. is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1983 · median 2007 among the 2,347 with a school on file
- Record last updated2011 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 family medicine physician records list a practice address in Mukwonago
They are 20 of the 198 NPPES records with a practice address in Mukwonago, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Mukwonago → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Darren Ellenbolt, M.D.Mukwonago, WI 531491700855012
- Steven Fehr, M.D.Mukwonago, WI 531491104899277
- Jeffrey Gentile, MDMukwonago, WI 531491699861021
- Daniel Johnson, M.D.Mukwonago, WI 531491225001225
- Ruth Lindberg, M.D.Mukwonago, WI 531491538177886
- Steven Meisner, M.D.Mukwonago, WI 531491073586046
- Linda Meyer, DOMukwonago, WI 531491326095308
- Anthony Norelli, M.D.Mukwonago, WI 531491093788176
Common questions
What is Steven G. Hammer, M.D.'s NPI number?
Steven G. Hammer, M.D.'s National Provider Identifier (NPI) is 1134192198, issued on Feb 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Steven G. Hammer, M.D. located?
The NPPES record lists a practice address at 240 W. Maple Ave, Mukwonago, WI, 53149. Phone: (262) 928-1900. Providers update this record themselves, so call before visiting.
How can I verify Steven G. Hammer, M.D.'s license?
NPPES lists Wisconsin license number 26218, 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 Steven G. Hammer, M.D. prescribe under Medicare Part D?
In 2024, Steven G. Hammer, M.D. had 296 Medicare Part D claims for 224 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.