William Ferril, MD
General Practice Physician · Whitefish, MT
William Ferril, MD is a general practice physician with a practice address in Whitefish, Montana, and NPI 1285737635, issued on Sep 7, 2006. Check the license (Montana 5332, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- William Ferril
- Credential
- MD
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- 5332 MT
Self-reported in NPPES; status is on the state search - Practice location
- 550 A Central Ave, Whitefish, MT 59937
- Phone
- (406) 862-3308
- Enumerated
- Sep 7, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 36 in Montana → Look up another NPI →
Verify William Ferril in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 5332Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average general practice physician in 2024
293 Medicare Part D claims for 50 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 17 claims were for opioids.
Most prescribed
- Potassium Chloride63 claims
- Levothyroxine Sodium40 claims
- Synthroid23 claims
- Prednisone20 claims
- Metformin Hcl19 claims
- Hydrochlorothiazide16 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 Ferril among 36 general practice physician records in Montana
William Ferril, MD is one of 36 general practice physician records with a practice address in Montana. 47% 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 11% of them.
- NPI issued2006 · 11% of these records are older, 39% newer
- In a Medicare fileYes · 47% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2007 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Physician providers in Montana
There are 36 general practice physician records in Montana.
All 36 in Montana → Every provider in Whitefish → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Reed Yeater, MDPoison, MT 598601336221613
- Jan Newman, MD, FACSClinton, MT 598251306059845
- Mackenzie Thomas, AGNP-CMissoula, MT 598081760319925
- Kristine Haasl, FNP-BCMissoula, MT 598031033838065
- Dana HeadapohlMissoula, MT 598021962562371
- Walter Peschel, M.D.Missoula, MT 598021952566192
- Roland Sweatman, MDMissoula, MT 598021497012009
- Denise Kelley, MDMissoula, MT 598011568469765
Common questions
What is William Ferril, MD's NPI number?
William Ferril, MD's National Provider Identifier (NPI) is 1285737635, issued on Sep 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Ferril, MD located?
The NPPES record lists a practice address at 550 A Central Ave, Whitefish, MT, 59937. Phone: (406) 862-3308. Providers update this record themselves, so call before visiting.
How can I verify William Ferril, MD's license?
NPPES lists Montana license number 5332, 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 Ferril, MD prescribe under Medicare Part D?
In 2024, William Ferril, MD had 293 Medicare Part D claims for 50 beneficiaries; the average among general practice physician prescribers was 3,030. 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.