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JOHN P. MCMAHON LCSW
NPI 1548464092
Social Worker in Westborough, MA

Active since June 11, 2007PECOS Enrolled
900 UNION ST, WESTBOROUGH, MA 01581(508) 898-2338(508) 366-9938 Get Directions Write a Review

NPPES record last updated: March 26, 2019. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About John P. Mcmahon Lcsw NPPES

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

JOHN P. MCMAHON LCSW (NPI 1548464092) is an individual social worker in Westborough, Massachusetts, licensed in Massachusetts (213699) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1548464092
Entity TypeIndividualMale
Primary Taxonomy104100000X
Provider Legal NameJOHN P. MCMAHONCredential: LCSW
Location Address900 UNION STWestborough, MA 01581-5408
Mailing Address5 Neponset St Fl Street2Worcester, MA 01606-2714 · (508) 368-5532 · Fax (508) 366-9938
Phone(508) 898-2338
Fax(508) 366-9938
Sole ProprietorNo
Enumeration DateJune 11, 2007
Last NPPES UpdateMarch 26, 2019
✔ NPI 1548464092 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial WorkerBehavioral Health & Social Service Providers
Taxonomy Code104100000X
License✔ Licensed in MA · 213699
Definition
A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.
900 UNION ST, Westborough, MA 01581
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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, Taro Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

John P. Mcmahon Lcsw is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 John Mcmahon reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Reliant Medical Group, Inc
10 mi
Family Medicine
5 NEPONSET ST
Worcester, MA 01606
  • Reassigned Medicare billing, Massachusetts enrollment
  • 718 clinicians in this Medicare group
NPI 1720017528 (508) 852-0600

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 20

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

JUDITH A MCNICHOLAS MD
Obstetrics & Gynecology (Urogynecology and Reconstructive Pelvic Surgery)
900 UNION ST
WESTBOROUGH, MA 01581
Worcester County (508) 871-0700
QUEST DIAGNOSTICS MASSACHUSETTS LLC
Clinical Medical Laboratory
900 UNION ST
WESTBOROUGH, MA 01581
Worcester County (866) 697-8378
KERRIE MCFEETERS N.P.
Nurse Practitioner (Pediatrics)
900 UNION ST
WESTBOROUGH, MA 01581
Worcester County (508) 898-2338
SWATI S SANE M.D.
Pediatrics
900 UNION ST
WESTBOROUGH, MA 01581
Worcester County (508) 898-2338
RELIANT MEDICAL GROUP
Optometrist
900 UNION ST
WESTBOROUGH, MA 01581
Worcester County (508) 856-9599
NINAD N SAMANT MD
Internal Medicine
900 UNION ST
WESTBOROUGH, MA 01581
Worcester County (508) 871-0700
SUSAN E KELLOGG PA
Physician Assistant
900 UNION ST
WESTBOROUGH, MA 01581
Worcester County (508) 871-0700
MARGARET R HINES MD
Obstetrics & Gynecology (Urogynecology and Reconstructive Pelvic Surgery)
900 UNION ST
WESTBOROUGH, MA 01581
Worcester County (508) 870-9350

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 John Mcmahon's NPI number?

The NPI number for John Mcmahon is 1548464092. It was assigned to this individual provider in the NPPES registry on June 11, 2007.

Where is John Mcmahon located?

John Mcmahon practices at 900 Union St, Westborough, MA 01581. The listed phone number is (508) 898-2338.

What is John Mcmahon's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

Is John Mcmahon enrolled in Medicare?

Yes. John Mcmahon is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for John Mcmahon's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Mcmahon reassigns Medicare benefits to Reliant Medical Group, Inc (Worcester, 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 John Mcmahon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does John Mcmahon accept?

Health plans from Anthem Blue Cross and Blue Shield, Harvard Pilgrim Health Care and Taro Health list John Mcmahon 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 John Mcmahon was last updated on March 26, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years 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.