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

Mr. Graham Warren Mason, MD

Individual provider Hospitalist Physician · NPI 1952978116

Mr. Graham Warren Mason, MD is a Hospitalist in Sioux City, Iowa. Qualified in 2021, 5 years ago. Practices with Sioux City Hospitalist Group, LLC, a 16-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
5
Licensed in
IA
In the registry since
2021
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

801 5th St
Sioux City, IA 51101-1326
Phone: (712) 279-2010
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence MD-53165 (IA)

Record details

NPI number1952978116
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 7, 2021
Last updated in NPPESJuly 30, 2024
Certification dateJuly 30, 2024

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Medical schoolOTHER
Graduated 2021 (5 years in practice)
Group practice Sioux City Hospitalist Group, Llc — 16 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients70
Services billed 187 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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Mercyone Siouxland Medical Center Hospital · Sioux City, IA
  • St Lukes Regional Medical Center Hospital · Sioux City, IA

Colleagues at Sioux City Hospitalist Group, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 16 clinicians in the practice; 9 are shown here.

Other providers in Sioux City