William C. Cullis, MD
Family Medicine Physician · Ronan, MT
William C. Cullis, MD is a family medicine physician with a practice address in Ronan, Montana, and NPI 1174685374, issued on Dec 14, 2006. Check the license (Montana 8425, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- William C. Cullis
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 8425 MT
Self-reported in NPPES; status is on the state search - Practice location
- 126 6TH Ave SW, Ronan, MT 59864
- Phone
- (406) 676-3600
- Enumerated
- Dec 14, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (406) 676-3738
- Medicaid ID
- 107746 MT
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 775 in Montana → Look up another NPI →
Also registered at 126 6TH Ave SW
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Alfiero, PA-CPhysician Assistant1417029059
- Elizabeth Baxter, SWLCSocial Worker1528710233
- Joanna Billings, D.O.Family Medicine Physician1447630868
- Stacey Burdett, FNP-BCNurse Practitioner1073208757
- Krystal Diel, LCSWClinical Social Worker1053907287
- Michael Dolecki, M.D.Orthopaedic Surgery Physician1033186655
Verify William C. Cullis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 8425Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average family medicine physician in 2024
185 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims.
Most prescribed
- Januvia48 claims
- Potassium Chloride13 claims
- Quetiapine Fumarate13 claims
- Torsemide13 claims
- Isosorbide Mononitrate Er12 claims
- Rosuvastatin Calcium12 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.
William C. Cullis among 775 family medicine physician records in Montana
William C. Cullis, MD is one of 775 family medicine physician records with a practice address in Montana. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 50% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2007 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 family medicine physician records list a practice address in Ronan
They are 15 of the 112 NPPES records with a practice address in Ronan, and 775 family medicine physician records in Montana.
All 775 in Montana → Every provider in Ronan → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Emily AndersonRonan, MT 598641750744942
- Joanna Billings, D.O.Ronan, MT 598641447630868
- John Foster, M.D.Ronan, MT 598641588864979
- Benjamin Grass, M.D.Ronan, MT 598641467894121
- Sharla Hart, M.D.Ronan, MT 598641043326739
- Laura Hoganson, MDRonan, MT 598641295112944
- Jason JohnsonRonan, MT 598641073044343
- Hikmat Maaliki, MDRonan, MT 598641295897650
Common questions
What is William C. Cullis, MD's NPI number?
William C. Cullis, MD's National Provider Identifier (NPI) is 1174685374, issued on Dec 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William C. Cullis, MD located?
The NPPES record lists a practice address at 126 6TH Ave SW, Ronan, MT, 59864. Phone: (406) 676-3600. Providers update this record themselves, so call before visiting.
How can I verify William C. Cullis, MD's license?
NPPES lists Montana license number 8425, as entered by the provider. 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 William C. Cullis, MD prescribe under Medicare Part D?
In 2024, William C. Cullis, MD had 185 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. 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.