Jacob J. Oyer, M.D.
Psychiatry Physician · Amherst, MA
Jacob J. Oyer, M.D. is a psychiatry physician with a practice address in Amherst, Massachusetts, and NPI 1376961235, issued on Mar 28, 2014. Check the license (Massachusetts 274373, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Jacob J. Oyer
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 274373 MA
Self-reported in NPPES; status is on the state search - Practice location
- 150 Infirmary Way, Amherst, MA 01003
- Phone
- (413) 577-5000
- Enumerated
- Mar 28, 2014
- Record last updated
- Oct 23, 2024
- Medicare enrollment
- Enrolled (PECOS I20221101001577); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,736 in Massachusetts → Look up another NPI →
Also registered at 150 Infirmary Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Dawn Beckman, FNPNurse Practitioner1750463857
- Deborah Berkman, PH.D.Psychologist1285954875
- Frederick Bloom, O.D.Optometrist1427114958
- James Bronner, RDRegistered Dietitian1457875593
Verify Jacob J. Oyer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 274373Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average psychiatry physician in 2024
13 Medicare Part D claims, against an average of 1,000 among the 35,054 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.
Bills Medicare through one group practice
- Baystate Medical Practices IncSpringfield, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jacob J. Oyer among 2,736 psychiatry physician records in Massachusetts
Jacob J. Oyer, 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 2014, is newer than 76% of them.
- NPI issued2014 · 76% of these records are older, 22% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated2013 · median 2005 among the 1,219 with a school on file
- Record last updated2024 · 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).
18 psychiatry physician records list a practice address in Amherst
They are 18 of the 769 NPPES records with a practice address in Amherst, and 2,736 psychiatry physician records in Massachusetts.
All 2,736 in Massachusetts → Every provider in Amherst → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Stewart Ascher, MDAmherst, MA 010031598843948
- Philip Close-Barber, DOAmherst, MA 010031992296206
- Benjamin Levy, MDAmherst, MA 010031063436822
- Charlene Patenaude, M.D.,Amherst, MA 010031891085908
- Marielle Abell, PAAmherst, MA 010021275644072
- Barry Farber, MDAmherst, MA 010021053499327
- Paul Fleischman, M.D.Amherst, MA 010021538284484
- Daniel Friedenson, M.DAmherst, MA 010021730189465
Common questions
What is Jacob J. Oyer, M.D.'s NPI number?
Jacob J. Oyer, M.D.'s National Provider Identifier (NPI) is 1376961235, issued on Mar 28, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Jacob J. Oyer, M.D. located?
The NPPES record lists a practice address at 150 Infirmary Way, Amherst, MA, 01003. Phone: (413) 577-5000. Providers update this record themselves, so call before visiting.
How can I verify Jacob J. Oyer, M.D.'s license?
NPPES lists Massachusetts license number 274373, 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 Jacob J. Oyer, M.D. prescribe under Medicare Part D?
In 2024, Jacob J. Oyer, M.D. had 13 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.