Marcus W. Tjia, MD
Psychiatry Physician · Wellesley, MA
Marcus W. Tjia, MD is a psychiatry physician with a practice address in Wellesley, Massachusetts, and NPI 1376605089, issued on Dec 16, 2006. Check the license (Massachusetts 230945, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Marcus W. Tjia
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 230945 MA
Self-reported in NPPES; status is on the state search - Practice location
- 230 Worcester St, Wellesley, MA 02481
- Phone
- (781) 431-5270
- Enumerated
- Dec 16, 2006
- Record last updated
- Mar 8, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (781) 431-5535
- Medicare enrollment
- Enrolled (PECOS I20070702000575); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 2002
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,736 in Massachusetts → Look up another NPI →
Also registered at 230 Worcester St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Susan Adamson, NPFamily Nurse Practitioner1316916604
- Dea Angiolillo, M.D.Internal Medicine Physician1649241985
- Eukeria Asamoah, PMHNPPsychiatric/Mental Health Nurse Practitioner1801596341
- Christine Baker, LMHCMental Health Counselor1992120893
- Mary Barker, M.D.Internal Medicine Physician1215908132
- Kalina Bergmann, PA-CInternal Medicine Physician1083549661
Verify Marcus W. Tjia in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 230945Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.3 times the Medicare Part D claims of the average psychiatry physician in 2024
5,271 Medicare Part D claims for 383 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Trazodone Hcl351 claims
- Lorazepam331 claims
- Duloxetine Hcl323 claims
- Clonazepam291 claims
- Sertraline Hcl286 claims
- Lamotrigine255 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
- Atrius Health IncDedham, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marcus W. Tjia among 2,736 psychiatry physician records in Massachusetts
Marcus W. Tjia, MD 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 51% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated2002 · median 2005 among the 1,219 with a school on file
- Record last updated2021 · 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).
36 psychiatry physician records list a practice address in Wellesley
They are 36 of the 1,117 NPPES records with a practice address in Wellesley, and 2,736 psychiatry physician records in Massachusetts.
All 2,736 in Massachusetts → Every provider in Wellesley → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Ann Briley, MDWellesley Hills, MA 024811740252360
- Stephanie Davidoff, M.D. PH.D.Wellesley, MA 024811669421236
- Mahnoosh Eslami, MDWellesley, MA 024811871545509
- Jerome Gans, MDWellesley, MA 024811306837455
- Stephen McDermott, MDWellesley, MA 024811366477499
- Edwin Mikkelsen, M.D.Wellesley, MA 024811992756530
- Richard Morrill, MDWellesley, MA 024811861449472
- Alison Phillips, M.D.Wellesley, MA 024811124067210
Common questions
What is Marcus W. Tjia, MD's NPI number?
Marcus W. Tjia, MD's National Provider Identifier (NPI) is 1376605089, issued on Dec 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marcus W. Tjia, MD located?
The NPPES record lists a practice address at 230 Worcester St, Wellesley, MA, 02481. Phone: (781) 431-5270. Providers update this record themselves, so call before visiting.
How can I verify Marcus W. Tjia, MD's license?
NPPES lists Massachusetts license number 230945, 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 Marcus W. Tjia, MD prescribe under Medicare Part D?
In 2024, Marcus W. Tjia, MD had 5,271 Medicare Part D claims for 383 beneficiaries; 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.