1. Home
  2. Directory
  3. Massachusetts
  4. Cambridge
  5. Psychiatry Neurology
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

SIMON M. W. LEJEUNE M.D.
NPI 1821035403
Psychiatry & Neurology - Psychiatry in Cambridge, MA

Active since June 01, 2006PECOS EnrolledAccepts Medicare Assignment
86.26/100
CMS Quality Rating
77 MASS AVE E23, MIT MEDICAL CENTER, CAMBRIDGE, MA 02139(617) 253-2916 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Simon M. W. Lejeune M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SIMON M. W. LEJEUNE M.D. (NPI 1821035403) is an individual psychiatry provider in Cambridge, Massachusetts, licensed in Massachusetts (56687) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Cambridge Health Alliance, and is a graduate of Harvard Medical School (1985).

NPPES Registry Identity

NPI1821035403
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameSIMON M. W. LEJEUNECredential: M.D.
Location Address77 MASS AVE E23, MIT MEDICAL CENTERCambridge, MA 02139
Mailing Address74 Beals St, Apt. #2Brookline, MA 02446-6011 · (617) 253-2916
Phone(617) 253-2916
Sole ProprietorNo
Medical School CMSHarvard Medical SchoolGraduated 1985
Enumeration DateJune 1, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1821035403 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in MA · 56687
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
77 MASS AVE E23, Cambridge, MA 02139
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Harvard Pilgrim Health Care.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Simon M. W. Lejeune M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1759438476
PECOS Enrollment IDI20090416000107
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
70 services13 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Cambridge Health Alliance

Acute Care Hospitals · Cambridge, MA
3/5 CMS rating
OwnershipGovernment - Local
CMS Certification Number220011
Location1493 Cambridge StreetCambridge, MA 02138 · Middlesex County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02139 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$189.86 typical visit price
range $63.72 – $189.86
Typical copayment $47.46 (range $15.93 – $47.46)
Most-billed visit code 99205
Established Patient
$78.84 typical visit price
range $21.07 – $155.29
Typical copayment $19.71 (range $5.26 – $38.82)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

86.26/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality78.84
Promoting Interoperability100
Improvement Activities40
Cost58.7

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Simon M. W. Lejeune's NPI number?

The NPI number for Simon M. W. Lejeune is 1821035403. It was assigned to this individual provider in the NPPES registry on June 1, 2006.

Where is Simon M. W. Lejeune located?

Simon M. W. Lejeune practices at 77 Mass Ave E23 Mit Medical Center, Cambridge, MA 02139. The listed phone number is (617) 253-2916.

What is Simon M. W. Lejeune's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Simon M. W. Lejeune enrolled in Medicare?

Yes. Simon M. W. Lejeune is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Simon M. W. Lejeune accept?

Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Simon M. W. Lejeune as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Simon M. W. Lejeune affiliated with any hospitals?

According to CMS data, Simon M. W. Lejeune is affiliated with Cambridge Health Alliance.

When was this NPI record last updated?

The NPPES record for Simon M. W. Lejeune was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 38 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.