Joshua Dean Mastenbrook, MD
Emergency Medicine Physician · Kalamazoo, MI
Joshua Dean Mastenbrook, MD is an emergency medicine physician with a practice address in Kalamazoo, Michigan, and NPI 1356661342, issued on Jun 2, 2010. Check the license (Michigan 4301096214, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Joshua Dean Mastenbrook
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 4301096214 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1521 Gull RD, Kalamazoo, MI 49048
- Phone
- (269) 226-7000
- Enumerated
- Jun 2, 2010
- Record last updated
- Nov 19, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20130528000625); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Human Medicine, 2010
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 3,083 in Michigan → Look up another NPI →
Also registered at 1521 Gull RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amanda Adams, FNPFamily Nurse Practitioner1912433582
- Ahsan Alam, MDInternal Medicine Physician1750943981
- Donna AndresenSocial Worker1003023730
- Nicholas Badgley, AGACNPCritical Care Medicine Nurse Practitioner1366921520
- Hannah Bagley, LLMSWMental Health Counselor1114595378
- Gretchen Barnas, M.D.Psychiatry Physician1013124114
Verify Joshua Dean Mastenbrook in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301096214Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average emergency medicine physician in 2024
39 Medicare Part D claims for 24 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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 practice group's MIPS final score for 2023 (Medicare payment program): 89.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Vituity-Michigan Health Services PCPlainwell, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joshua Dean Mastenbrook among 3,083 emergency medicine physician records in Michigan
Joshua Dean Mastenbrook, MD is one of 3,083 emergency medicine physician records with a practice address in Michigan. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 42% of them.
- NPI issued2010 · 42% of these records are older, 55% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2010 · median 2013 among the 1,931 with a school on file
- Record last updated2018 · 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 207P00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
154 emergency medicine physician records list a practice address in Kalamazoo
They are 154 of the 6,553 NPPES records with a practice address in Kalamazoo, and 3,083 emergency medicine physician records in Michigan.
All 3,083 in Michigan → Every provider in Kalamazoo → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Wallace Broadbent, D.O.Kalamazoo, MI 490481861443202
- William Clegg, M.D.Kalamazoo, MI 490481841241288
- Millard Doster, MDKalamazoo, MI 490481760433999
- Charles Dwan, MDKalamazoo, MI 490481124006465
- Glenn Ekblad, D.O.Kalamazoo, MI 490481427009646
- Christopher Fish, D.O.Kalamazoo, MI 490481568414845
- Jose Fuertes, M.D.Kalamazoo, MI 490481962453183
- Robert Hill, M.D.Kalamazoo, MI 490481063464345
Common questions
What is Joshua Dean Mastenbrook, MD's NPI number?
Joshua Dean Mastenbrook, MD's National Provider Identifier (NPI) is 1356661342, issued on Jun 2, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Joshua Dean Mastenbrook, MD located?
The NPPES record lists a practice address at 1521 Gull RD, Kalamazoo, MI, 49048. Phone: (269) 226-7000. Providers update this record themselves, so call before visiting.
How can I verify Joshua Dean Mastenbrook, MD's license?
NPPES lists Michigan license number 4301096214, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Joshua Dean Mastenbrook, MD prescribe under Medicare Part D?
In 2024, Joshua Dean Mastenbrook, MD had 39 Medicare Part D claims for 24 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Joshua Dean Mastenbrook, MD's MIPS final score?
The 2023 MIPS final score is 89.6 of 100, reported for the practice group. 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.