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WILLIAM CLARKE MARONN LICSW
NPI 1003617119
Social Worker - Clinical in Lexington, MA

Active since March 24, 2025PECOS EnrolledAccepts Medicare Assignment
76 BEDFORD ST STE 22, LEXINGTON, MA 02420(617) 866-0810 Get Directions Write a Review

NPPES record last updated: June 2, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jun 2, 2025, Mar 24, 2025 (2 updates tracked since 2025).

About William Clarke Maronn Licsw NPPES

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

WILLIAM CLARKE MARONN LICSW (NPI 1003617119) is an individual clinical provider in Lexington, Massachusetts, licensed in Massachusetts (LICSW1140764) and active in the NPI registry since March 2025. He is enrolled in Medicare PECOS and is a graduate of Other (2022).

NPPES Registry Identity

NPI1003617119
Entity TypeIndividualMale
Primary Taxonomy1041C0700X
Provider Legal NameWILLIAM CLARKE MARONNCredential: LICSW
Location Address76 BEDFORD ST STE 22Lexington, MA 02420-4641
Mailing Address76 Bedford St Ste 22Lexington, MA 02420-4641 · (617) 866-0810
Phone(617) 866-0810
Sole ProprietorYes
Medical School CMSOtherGraduated 2022
Enumeration DateMarch 24, 2025
Last NPPES UpdateJune 2, 20252 updates tracked since enumeration
NPPES CertifiedJune 2, 2025
✔ NPI 1003617119 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in MA · LICSW1140764
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
76 BEDFORD ST STE 22, Lexington, MA 02420
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include 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

William Clarke Maronn Licsw 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 ID9335645068
PECOS Enrollment IDI20251001004212
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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02420 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
$0.00 typical visit price
range $63.72 – $189.86
Typical copayment $0.00 (range $15.93 – $47.46)
Most-billed visit code NA
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.

Other Providers at the Same Location NPPES 2

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

BILL MARONN LICSW
Clinic/Center (Adult Mental Health)
76 BEDFORD ST STE 22
LEXINGTON, MA 02420
Middlesex County (617) 866-0810
ARIEL BAKER HANDY PHD
Psychologist
76 BEDFORD ST STE 22
LEXINGTON, MA 02420
Middlesex County (857) 201-0605

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 William Maronn's NPI number?

The NPI number for William Maronn is 1003617119. It was assigned to this individual provider in the NPPES registry on March 24, 2025.

Where is William Maronn located?

William Maronn practices at 76 Bedford St Ste 22, Lexington, MA 02420. The listed phone number is (617) 866-0810.

What is William Maronn's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is William Maronn enrolled in Medicare?

Yes. William Maronn 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 William Maronn accept?

Health plans from Harvard Pilgrim Health Care list William Maronn 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 William Maronn was last updated on June 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months 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.