John J. Mazur, M.D.
Pulmonary Disease Physician · Great Falls, MT
John J. Mazur, M.D. is a pulmonary disease physician with a practice address in Great Falls, Montana, and NPI 1659364651, issued on Aug 24, 2005. Check the license (Montana 12032, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John J. Mazur
- Credential
- M.D.
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- 12032 MT
Self-reported in NPPES; status is on the state search - Practice location
- 1400 29TH St S, Great Falls, MT 59405
- Phone
- (406) 454-2171
- Enumerated
- Aug 24, 2005
- Record last updated
- Aug 10, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (406) 771-3021
- Medicaid ID
- 1659364651 MT
- Medicare enrollment
- Enrolled (PECOS I20090917000037); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1986
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 48 in Montana → Look up another NPI →
Also registered at 1400 29TH St S
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Steven Akre, MDRheumatology Physician1114928090
- Kevin Allen, CRNACertified Registered Nurse Anesthetist1629415229
- James Asthalter, DOFamily Medicine Physician1023019908
- Crystal Bahnson, CPNPPediatric Nurse Practitioner1932621240
- Sandra Bailey, D.O.Obstetrics & Gynecology Physician1396772067
- Kylee BakkerPediatric Nurse Practitioner1619453552
Verify John J. Mazur in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 12032Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average pulmonary disease physician in 2024
3,020 Medicare Part D claims for 360 beneficiaries, against an average of 1,425 among the 11,596 providers of this specialty who prescribed in Part D. Brand-name drugs were 55% of claims.
Most prescribed
- Trelegy Ellipta299 claims
- Stiolto Respimat226 claims
- Albuterol Sulfate Hfa204 claims
- Breztri Aerosphere160 claims
- Montelukast Sodium156 claims
- Prednisone145 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.
The MIPS final score for 2023 (Medicare payment program): 87.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,159.34
47 payments; by number, the most common kind was food and beverage; the largest payer was Merck Sharp & Dohme LLC. The 8,806 providers of this specialty with any payment received $5,159.88 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Great Falls Clinic LLCGreat Falls, MT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John J. Mazur among 48 pulmonary disease physician records in Montana
John J. Mazur, M.D. is one of 48 pulmonary disease physician records with a practice address in Montana. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 81% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 75% of these records are
- Graduated1986 · median 1998 among the 36 with a school on file
- Record last updated2011 · 29% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pulmonary Disease Physician providers in Montana
There are 48 pulmonary disease physician records in Montana.
All 48 in Montana → Every provider in Great Falls → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- Sheela Ahmed, MDGreat Falls, MT 594051083736227
- Merhala Balasubramaniam, M.D.Great Falls, MT 594051629450333
- Sean Dow, M.D.Great Falls, MT 594051871535096
- Robert Grasseschi, MDGreat Falls, MT 594051548261274
- Richard Kearley, MDGreat Falls, MT 594051386630952
- William Krause, MDGreat Falls, MT 594051659395697
- Megan Sisk, D.O.Great Falls, MT 594051306132279
- Gabor Varju, MDGreat Falls, MT 594051235342999
Common questions
What is John J. Mazur, M.D.'s NPI number?
John J. Mazur, M.D.'s National Provider Identifier (NPI) is 1659364651, issued on Aug 24, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John J. Mazur, M.D. located?
The NPPES record lists a practice address at 1400 29TH St S, Great Falls, MT, 59405. Phone: (406) 454-2171. Providers update this record themselves, so call before visiting.
How can I verify John J. Mazur, M.D.'s license?
NPPES lists Montana license number 12032, 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 John J. Mazur, M.D. prescribe under Medicare Part D?
In 2024, John J. Mazur, M.D. had 3,020 Medicare Part D claims for 360 beneficiaries; the average among pulmonary disease physician prescribers was 1,425. Part D covers Medicare prescriptions only.
What is John J. Mazur, M.D.'s MIPS final score?
The 2023 MIPS final score is 87.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.