Kimberly Mastis, M.D.
Psychiatry Physician · West Boylston, MA
Kimberly Mastis, M.D. is a psychiatry physician with a practice address in West Boylston, Massachusetts, and NPI 1285791780, issued on Jan 3, 2007. Check the license (Massachusetts 236381, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Kimberly Mastis
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 236381 MA
Self-reported in NPPES; status is on the state search - Practice location
- 148 Worcester St, West Boylston, MA 01583
- Phone
- (508) 835-1735
- Enumerated
- Jan 3, 2007
- Record last updated
- May 2, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20091209000190); may accept Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,736 in Massachusetts → Look up another NPI →
Also registered at 148 Worcester St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kristen BirchMental Health Counselor1447567839
- Michael Birnkrant, LMHCMental Health Counselor1699108407
- Elizabeth ChristianClinical Social Worker1710440813
- Joan Curran, LMHC, BCBA, LABAMental Health Counselor1326369059
- Marcia Galvinhill, PH.D.Clinical Psychologist1912013970
- Tracey Guertin, PH.D., H.S.P.Psychologist1326104126
Verify Kimberly Mastis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 236381Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average psychiatry physician in 2024
65 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Quetiapine Fumarate Er12 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.
Bills Medicare through one group practice
- Pediatric Behavioral Health LLCWest Boylston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kimberly Mastis among 2,736 psychiatry physician records in Massachusetts
Kimberly Mastis, M.D. is one of 2,736 psychiatry physician records with a practice address in Massachusetts. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 49% of them.
- NPI issued2007 · 49% of these records are older, 37% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated2004 · median 2005 among the 1,219 with a school on file
- Record last updated2012 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatry Physician providers in Massachusetts
There are 2,736 psychiatry physician records in Massachusetts.
All 2,736 in Massachusetts → Every provider in West Boylston → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Rudolph Agosti, MDWestborough, MA 015811770625014
- Elizabeth Degrush, D.O.Westborough, MA 015811669767539
- James Gilmour, M.D.Westborough, MA 015811578507190
- Jacob Holzer, M.D.Westborough, MA 015811144235433
- Aliya Khan, M.D.Westborough, MA 015811528307352
- Joshua Kriegel, MDWestborough, MA 015811477013910
- Andreas Laddis, M.D.Westborough, MA 015811821011966
- David McGarry, M.D.Westborough, MA 015811407909351
Common questions
What is Kimberly Mastis, M.D.'s NPI number?
Kimberly Mastis, M.D.'s National Provider Identifier (NPI) is 1285791780, issued on Jan 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Kimberly Mastis, M.D. located?
The NPPES record lists a practice address at 148 Worcester St, West Boylston, MA, 01583. Phone: (508) 835-1735. Providers update this record themselves, so call before visiting.
How can I verify Kimberly Mastis, M.D.'s license?
NPPES lists Massachusetts license number 236381, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Kimberly Mastis, M.D. prescribe under Medicare Part D?
In 2024, Kimberly Mastis, M.D. had 65 Medicare Part D claims; the average among psychiatry physician prescribers was 1,000. 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.