Graham Warren Mason, M.D.
Hospitalist Physician · Sioux City, IA
Graham Warren Mason, M.D. is a hospitalist physician with a practice address in Sioux City, Iowa, and NPI 1952978116, issued on Jun 7, 2021. Check the license (Iowa MD-53165, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Graham Warren Mason
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- MD-53165 IA
Self-reported in NPPES; status is on the state search - Practice location
- 801 5TH St, Sioux City, IA 51101
- Phone
- (712) 279-2010
- Enumerated
- Jun 7, 2021
- Record last updated
- Jul 30, 2024
- Medicare enrollment
- Enrolled (PECOS I20240702001322); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 302 in Iowa → Look up another NPI →
Also registered at 801 5TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ahmed AbdulrahmanHospitalist Physician1972252856
- Monsurat AdelekePsychiatric/Mental Health Nurse Practitioner1669308433
- Ali Aljuhani, LMSWClinical Social Worker1366918062
- Ashley Anderson, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1881499242
- Peter Anderson, M.D.Internal Medicine Physician1114967858
- Sydney Backstrom, PHARMDPharmacist1407713357
Verify Graham Warren Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license MD-53165Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% fewer Medicare Part D claims than the average hospitalist physician in 2024
279 Medicare Part D claims for 47 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate17 claims
- Albuterol Sulfate Hfa16 claims
- Atorvastatin Calcium16 claims
- Lisinopril12 claims
- Simvastatin12 claims
- Metoprolol Succinate11 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 one group practice
- Sioux City Hospitalist Group, LLCSioux City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Graham Warren Mason among 302 hospitalist physician records in Iowa
Graham Warren Mason, M.D. is one of 302 hospitalist physician records with a practice address in Iowa. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 77% of them.
- NPI issued2021 · 77% of these records are older, 16% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated2021 · median 2014 among the 243 with a school on file
- Record last updated2024 · 26% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Iowa
There are 302 hospitalist physician records in Iowa.
All 302 in Iowa → Every provider in Sioux City → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Ahmed AbdulrahmanSioux City, IA 511011972252856
- Larry Sellers, MDSioux City, IA 511011598714875
- Laura Armstrong, ARNPSpencer, IA 513011548782964
- Zubair Hassan Bodla, M.D.Waterloo, IA 507031427710698
- Julio Chirinos Lazarte, MDWaterloo, IA 507031285940338
- Mariam Hashmi, M.D.Waterloo, IA 507031427623651
- Benjamin Howe, D.O.Waterloo, IA 507031134359110
- Igor Babets, MDWaterloo, IA 507021992265912
Common questions
What is Graham Warren Mason, M.D.'s NPI number?
Graham Warren Mason, M.D.'s National Provider Identifier (NPI) is 1952978116, issued on Jun 7, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Graham Warren Mason, M.D. located?
The NPPES record lists a practice address at 801 5TH St, Sioux City, IA, 51101. Phone: (712) 279-2010. Providers update this record themselves, so call before visiting.
How can I verify Graham Warren Mason, M.D.'s license?
NPPES lists Iowa license number MD-53165, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Graham Warren Mason, M.D. prescribe under Medicare Part D?
In 2024, Graham Warren Mason, M.D. had 279 Medicare Part D claims for 47 beneficiaries; the average among hospitalist physician prescribers was 521. 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.