Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Ryan Michael Holthaus, MD

Individual provider Diagnostic Radiology Physician · NPI 1609822873

Ryan Michael Holthaus, MD practises Diagnostic Radiology in Mason City, Iowa. Graduated from University of Iowa, Rj & L Carver College of Medicine in 2001, 25 years ago. Practices with Radiologists of North Iowa PC, a 14-clinician group and works from 8 locations. Licensed in Iowa.

Years since qualifying
25
Trained at
University of Iowa, Rj & L Carver College of Medicine
Licensed in
IA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1010 4th St SW Ste 100
Mason City, IA 50401-2857
Phone: (641) 424-0102
Fax: (641) 424-8059
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (7)

  • 403 1st St Se, Belmond, IA 50421-1201 — (844) 474-4321
  • 104 S Story St, Boone, IA 50036-4737 — (844) 474-4321
  • 1316 S Main St, Clarion, IA 50525-2019 — (444) 744-3218
  • 401 S 17th St, Clear Lake, IA 50428-2304 — (844) 474-4321
  • 2700 1st Ave S, Fort Dodge, IA 50501-4300 — (844) 474-4321
  • 840 W Us Highway 18, Garner, IA 50438-1023 — (844) 474-4321
  • 1924 Superior St, Webster City, IA 50595-3146 — (844) 474-4321

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence 36598 (IA)

Record details

NPI number1609822873
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 26, 2006
Last updated in NPPESMarch 11, 2025
Certification dateMarch 11, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF IOWA, RJ & L CARVER COLLEGE OF MEDICINE
Graduated 2001 (25 years in practice)
Group practice Radiologists Of North Iowa Pc — 14 clinicians
Accepts Medicare assignment Not indicated
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Leg revascularization (restoring blood flow) 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients1,647
Services billed 2,594 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $72 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Radiologists of North Iowa PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 14 clinicians in the practice; 4 are shown here.

Other providers in Mason City