Marcela Horvitz-Lennon, MD
Psychiatry Physician · Somerville, MA
Marcela Horvitz-Lennon, MD is a psychiatry physician with a practice address in Somerville, Massachusetts, and NPI 1528189073, issued on Apr 3, 2007. Check the license (Massachusetts 153879, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Marcela Horvitz-Lennon
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- 153879 MA
MD425424 PA
Self-reported in NPPES; status is on the state search - Practice location
- 26 Central Street, Somerville, MA 02145
- Phone
- (617) 591-6300
- Enumerated
- Apr 3, 2007
- Record last updated
- Aug 20, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160210001772); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,736 in Massachusetts → Look up another NPI →
Verify Marcela Horvitz-Lennon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 153879Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average psychiatry physician in 2024
838 Medicare Part D claims for 38 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Clozapine124 claims
- Sertraline Hcl89 claims
- Lorazepam53 claims
- Olanzapine50 claims
- Haloperidol39 claims
- Benztropine Mesylate34 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 practice group's MIPS final score for 2023 (Medicare payment program): 86.3 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
- Cambridge Public Health CommissionCambridge, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marcela Horvitz-Lennon among 2,736 psychiatry physician records in Massachusetts
Marcela Horvitz-Lennon, 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 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
- Graduated1987 · median 2005 among the 1,219 with a school on file
- Record last updated2016 · 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 Somerville → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Benjamin Silverman, MDSomerville, MA 021451992861835
- Leslie Fenn, M.D.Somerville, MA 021441588635163
- Amanda Gruber, M.D.Somerville, MA 021441235218504
- Anne Gurian, MDSomerville, MA 021441528154309
- John Lloyd, MDSomerville, MA 021441245204932
- Amruthur Gita Ramamurthy, M.D.Cambridge, MA 021441205894722
- Jon Boyd, M.D., PH.D.Somerville, MA 021431932140258
- Robert Dunn, M.D.Somerville, MA 021431174639090
Common questions
What is Marcela Horvitz-Lennon, MD's NPI number?
Marcela Horvitz-Lennon, MD's National Provider Identifier (NPI) is 1528189073, issued on Apr 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Marcela Horvitz-Lennon, MD located?
The NPPES record lists a practice address at 26 Central Street, Somerville, MA, 02145. Phone: (617) 591-6300. Providers update this record themselves, so call before visiting.
How can I verify Marcela Horvitz-Lennon, MD's license?
NPPES lists Massachusetts license number 153879, 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 Marcela Horvitz-Lennon, MD prescribe under Medicare Part D?
In 2024, Marcela Horvitz-Lennon, MD had 838 Medicare Part D claims for 38 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
What is Marcela Horvitz-Lennon, MD's MIPS final score?
The 2023 MIPS final score is 86.3 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.