Ryan H. Holzhauer, M.D.
Emergency Medicine Physician · Janesville, WI
Ryan H. Holzhauer, M.D. is an emergency medicine physician with a practice address in Janesville, Wisconsin, and NPI 1508272139, issued on Jul 3, 2014. Check the license (Wisconsin 65434-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Ryan H. Holzhauer
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 65434-20 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1000 Mineral Point Ave, Janesville, WI 53548
- Phone
- (414) 303-5678
- Enumerated
- Jul 3, 2014
- Record last updated
- Jun 21, 2018 (not updated in 8 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,464 in Wisconsin → Look up another NPI →
Also registered at 1000 Mineral Point Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marwan Abdulsattar, MDAnesthesiology Physician1265790695
- Kathleen Agard, MDAnesthesiology Physician1558503235
- Imdad Ahmed, MDCardiovascular Disease Physician1053536219
- Muhammad Alkhan, MDInternal Medicine Physician1114950813
- Rachel Allen, MDEmergency Medicine Physician1184823999
- Giuseppe Altamore, DOEmergency Medicine Physician1477828564
Verify Ryan H. Holzhauer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 65434-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% fewer Medicare Part D claims than the average emergency medicine physician in 2024
193 Medicare Part D claims for 139 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 11 claims were for opioids.
Most prescribed
- Sulfamethoxazole-Trimethoprim29 claims
- Ondansetron Odt25 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.
Ryan H. Holzhauer among 1,464 emergency medicine physician records in Wisconsin
Ryan H. Holzhauer, M.D. is one of 1,464 emergency medicine physician records with a practice address in Wisconsin. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 67% of them.
- NPI issued2014 · 67% of these records are older, 30% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2018 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
40 emergency medicine physician records list a practice address in Janesville
They are 40 of the 1,538 NPPES records with a practice address in Janesville, and 1,464 emergency medicine physician records in Wisconsin.
All 1,464 in Wisconsin → Every provider in Janesville → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Rachel Allen, MDJanesville, WI 535481184823999
- Yone Amuka, MDJanesville, WI 535481790929693
- Kevin Dardis, DOJanesville, WI 535481609894526
- Martin FedkoJanesville, WI 535481134351430
- Franz Keilhauer, MDJanesville, WI 535481295817047
- Joseph Kovacic, DOJanesville, WI 535481144419896
- Louis Kroot, M.D.Janesville, WI 535481649239658
- Sean Marquis, MDJanesville, WI 535481053554089
Common questions
What is Ryan H. Holzhauer, M.D.'s NPI number?
Ryan H. Holzhauer, M.D.'s National Provider Identifier (NPI) is 1508272139, issued on Jul 3, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Ryan H. Holzhauer, M.D. located?
The NPPES record lists a practice address at 1000 Mineral Point Ave, Janesville, WI, 53548. Phone: (414) 303-5678. Providers update this record themselves, so call before visiting.
How can I verify Ryan H. Holzhauer, M.D.'s license?
NPPES lists Wisconsin license number 65434-20, 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 H. Holzhauer, M.D. prescribe under Medicare Part D?
In 2024, Ryan H. Holzhauer, M.D. had 193 Medicare Part D claims for 139 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.