Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Ryan Michael Holthaus, MD

Individual provider Diagnostic Radiology Physician · NPI 1609822873

Ryan Michael Holthaus, MD is a 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.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

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

Directions in Google Maps · Apple Maps · OpenStreetMap

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
Mailing address1416 6th St Sw, Mason City, IA 50401-4818

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

Other providers in Mason City