Ryan D. Holzmacher, MD
Internal Medicine Physician · Greenfield, WI
Ryan D. Holzmacher, MD is an internal medicine physician with a practice address in Greenfield, Wisconsin, and NPI 1598700601, issued on Jun 20, 2006. Check the license (Wisconsin 42642-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Ryan D. Holzmacher
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 42642-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 5017 S 110TH St, Greenfield, WI 53228
- Phone
- (414) 301-3531
- Enumerated
- Jun 20, 2006
- Record last updated
- Sep 20, 2024
- Medicaid ID
- 34749000 WI
- Medicare enrollment
- Enrolled (PECOS I20060905000204); accepts Medicare assignment
- Medical or professional school
- Southern Illinois University School Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Verify Ryan D. Holzmacher in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 42642-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
67 Medicare Part D claims for 25 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of 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 3 group practices
- Curana Health OF Wisconsin IncHartford, WI
- Maple Medical SCWaukesha, WI
- Oak Medical SCBrookfield, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ryan D. Holzmacher among 2,078 internal medicine physician records in Wisconsin
Ryan D. Holzmacher, MD is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 46% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1999 · median 2002 among the 1,098 with a school on file
- Record last updated2024 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
13 internal medicine physician records list a practice address in Greenfield
They are 13 of the 961 NPPES records with a practice address in Greenfield, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Greenfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Manoj Mody, M.D.Greenfield, WI 532281639257140
- Albert Adams, M.D.West Allis, WI 532271649544982
- William Burns, M.D.West Allis, WI 532271497828339
- Sherif Gobrial, M.D.,West Allis, WI 532271477781102
- Deborah Lemke, MDWest Allis, WI 532271407982879
- Faiqa Malik, M.D.West Allis, WI 532271205003050
- Malini Mehta, M.D.West Allis, WI 532271285709816
- Paresh Mistry, M.D.West Allis, WI 532271831374636
Common questions
What is Ryan D. Holzmacher, MD's NPI number?
Ryan D. Holzmacher, MD's National Provider Identifier (NPI) is 1598700601, issued on Jun 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ryan D. Holzmacher, MD located?
The NPPES record lists a practice address at 5017 S 110TH St, Greenfield, WI, 53228. Phone: (414) 301-3531. Providers update this record themselves, so call before visiting.
How can I verify Ryan D. Holzmacher, MD's license?
NPPES lists Wisconsin license number 42642-020, 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 Ryan D. Holzmacher, MD prescribe under Medicare Part D?
In 2024, Ryan D. Holzmacher, MD had 67 Medicare Part D claims for 25 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.