Gay J. Canaris, MD
Internal Medicine Physician · Billings, MT
Gay J. Canaris, MD is an internal medicine physician with a practice address in Billings, Montana, and NPI 1851358147, issued on Apr 28, 2006. Check the license on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Gay J. Canaris
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20200 NE
Self-reported in NPPES; status is on the state search - Practice location
- 801 N 29TH St, Billings, MT 59101
- Phone
- (406) 238-2500
- Enumerated
- Apr 28, 2006
- Record last updated
- Feb 22, 2022
- Medicaid ID
- 47078557589 NE
- Medicare enrollment
- Enrolled (PECOS I20181102000791); accepts Medicare assignment
- Medical or professional school
- Southwest School Of Medicine And Hospital, 1987
- Entity
- Type 1 · individual
Also registered at 801 N 29TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kylie Abeson, MD, MPHPediatrics Physician1699334987
- Juan Adams, M.D.Allergy & Immunology Physician1144512096
- Daniel AlmeStudent in an Organized Health Care Education/Training Program1477349165
- Luis Alvarez, MDClinical Cardiac Electrophysiology Physician1417951922
- Annalee Anderson, MA, CCC-SLPSpeech-Language Pathologist1083047088
- Bijan Andrade, DPMFoot & Ankle Surgery Podiatrist1891059556
Verify Gay J. Canaris in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical ExaminersCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% more Medicare Part D claims than the average internal medicine physician in 2024
3,458 Medicare Part D claims for 302 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 45 claims were for opioids.
Most prescribed
- Atorvastatin Calcium260 claims
- Losartan Potassium217 claims
- Levothyroxine Sodium201 claims
- Lisinopril189 claims
- Rosuvastatin Calcium170 claims
- Amlodipine Besylate123 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.
One hospital affiliation
- Billings ClinicBillings, MT · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
80 internal medicine physician records list a practice address in Billings
They are 80 of the 4,035 NPPES records with a practice address in Billings, and 324 internal medicine physician records in Montana.
All 80 in Billings → All 324 in Montana → Every provider in Billings →
Other internal medicine physician records in Montana
- Ryan Adams, MDMissoula, MT1790952653
- Timothy Adams, MDBozeman, MT1891706537
- Dee Althouse, MDHavre, MT1578776118
- Faust Alvarez, MDHelena, MT1962516070
- Rebecca Anderson, MDMissoula, MT1437173440
- Yee Chuan Ang, M.D.Billings, MT1104138668
- Faranak Argani, MDBillings, MT1558475954
- Janet Armstrong, M.D.Glasgow, MT1215949557
- Susan Askin, MDFort Harrison, MT1588771604
- James Attarian, MDBozeman, MT1144209198
Common questions
What is Gay J. Canaris, MD's NPI number?
Gay J. Canaris, MD's National Provider Identifier (NPI) is 1851358147, issued on Apr 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gay J. Canaris, MD located?
The NPPES record lists a practice address at 801 N 29TH St, Billings, MT, 59101. Phone: (406) 238-2500. Providers update this record themselves, so call before visiting.
How can I verify Gay J. Canaris, MD's license?
Search the Montana Board of Medical Examiners at https://ebiz.mt.gov/POL/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gay J. Canaris, MD prescribe under Medicare Part D?
In 2024, Gay J. Canaris, MD had 3,458 Medicare Part D claims for 302 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.