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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ISABELLE B DOUYON LMHC
NPI 1609139948
Counselor - Mental Health in Lexington, MA

Active since June 21, 2012PECOS Enrolled
450 BEDFORD ST STE 2400, LEXINGTON, MA 02420(617) 302-9171(617) 458-8644 Get Directions Write a Review

NPPES record last updated: November 8, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Nov 8, 2026, Feb 11, 2021 (2 updates tracked since 2021).

About Isabelle B Douyon Lmhc NPPES

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

ISABELLE B DOUYON LMHC (NPI 1609139948) is an individual mental health provider in Lexington, Massachusetts, licensed in Massachusetts (LMHC12149) and active in the NPI registry since June 2012. She is enrolled in Medicare PECOS and is a graduate of Other (2015).

NPPES Registry Identity

NPI1609139948
Entity TypeIndividualFemale
Primary Taxonomy101YM0800X
Provider Legal NameISABELLE B DOUYONCredential: LMHC
Location Address450 BEDFORD ST STE 2400Lexington, MA 02420-1544
Mailing Address2321 Founders WaySaugus, MA 01906-4546 · (781) 420-2645
Phone(617) 302-9171
Fax(617) 458-8644
Sole ProprietorYes
Medical School CMSOtherGraduated 2015
Enumeration DateJune 21, 2012
Last NPPES UpdateNovember 8, 20262 updates tracked since enumeration
NPPES CertifiedNovember 8, 2026
✔ NPI 1609139948 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
License✔ Licensed in MA · LMHC12149
450 BEDFORD ST STE 2400, Lexington, MA 02420
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, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Isabelle B Douyon Lmhc 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 ID3173019064
PECOS Enrollment IDI20251230002759
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.

Medicare Billing Reassignment

Medicare enrollment records show Isabelle Douyon reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Metro Boston Mental Health, PLLC
11 mi
Mental Health
109 OAK ST STE 201
Newton, MA 02464
  • Reassigned Medicare billing, Massachusetts enrollment
  • 24 clinicians in this Medicare group
NPI 1184313397 (617) 302-9171

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 15

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DANA LINENDOLL
Counselor (Mental Health)
450 BEDFORD ST STE 2400
LEXINGTON, MA 02420
Middlesex County (617) 302-9171
OLIVIA GRACE CATALDO
Social Worker (Clinical)
450 BEDFORD ST STE 2400
LEXINGTON, MA 02420
Middlesex County (781) 633-7779
MISS MARIA LACRETA MA
Counselor (Mental Health)
450 BEDFORD ST STE 2400
LEXINGTON, MA 02420
Middlesex County (617) 302-9171
MS. EMMA SMITH MA
Music Therapist
450 BEDFORD ST STE 2400
LEXINGTON, MA 02420
Middlesex County (781) 633-7779
MICHELE LYNN SANTIAGO-MAHONEY
Counselor (Mental Health)
450 BEDFORD ST STE 2400
LEXINGTON, MA 02420
Middlesex County (617) 302-7941
HANNAH PELL
Counselor (Mental Health)
450 BEDFORD ST STE 2400
LEXINGTON, MA 02420
Middlesex County (703) 307-4584
JULIA NICOLE CASTAGNA
Counselor (Mental Health)
450 BEDFORD ST STE 2400
LEXINGTON, MA 02420
Middlesex County (781) 633-7779
MALINDA KING
Counselor (Mental Health)
450 BEDFORD ST STE 2400
LEXINGTON, MA 02420
Middlesex County (781) 633-7779

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 Isabelle Douyon's NPI number?

The NPI number for Isabelle Douyon is 1609139948. It was assigned to this individual provider in the NPPES registry on June 21, 2012.

Where is Isabelle Douyon located?

Isabelle Douyon practices at 450 Bedford St Ste 2400, Lexington, MA 02420. The listed phone number is (617) 302-9171.

What is Isabelle Douyon's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

Is Isabelle Douyon enrolled in Medicare?

Yes. Isabelle Douyon 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.

Which organization bills Medicare for Isabelle Douyon's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Isabelle Douyon reassigns Medicare benefits to Metro Boston Mental Health, PLLC (Newton, MA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Isabelle Douyon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Isabelle Douyon accept?

Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Isabelle Douyon 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.

When was this NPI record last updated?

The NPPES record for Isabelle Douyon was last updated on November 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.