John P. McMahon, LCSW
- Affiliated sites
- 2
- Medical groups
- 2
- State license
- 1
- Year NPI issued
- 2007
- Practice address
- 24 Lyman St, Westborough, MA 01581
- Practice phone
- Call (508) 439-3911
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Castlebrook Counseling Services, Inc.
Westborough, Massachusetts
Find John McMahon's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
John P. McMahon is a social worker in Westborough, Massachusetts
John McMahon practices at Castlebrook Counseling Services, Inc. in Westborough, Massachusetts.
John McMahon's NPI, 1548464092, was assigned on June 11, 2007. John McMahon holds Massachusetts license 213699.
- NPI
- 1548464092NPI Registry (opens in a new tab)
- NPI enumeration date
- June 11, 2007
- NPI status
- Active
- Practice phone
- (508) 439-3911
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
John P. McMahon practices at Castlebrook Counseling Services, Inc. in Westborough, Massachusetts
John McMahon's primary practice is Castlebrook Counseling Services, Inc., at 24 Lyman St, Westborough, MA 01581 in Worcester County. The practice phone is (508) 439-3911.
- Castlebrook Counseling Services, Inc.24 Lyman St, Westborough, MA 01581 · Worcester CountyPhone(508) 439-3911
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
John P. McMahon is affiliated with 3 sites of care and 2 medical groups
John McMahon's primary practice is Castlebrook Counseling Services, Inc. in Westborough, Massachusetts. The medical group on file is Reliant Medical Group. Dmand AI also links John McMahon to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at John P. McMahon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John McMahon practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Castlebrook Counseling Services, Inc. | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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John P. McMahon is one of 808 social workers in Massachusetts
Social worker is John McMahon's primary specialty in the NPI Registry, under taxonomy code 104100000X. John McMahon is licensed in Massachusetts.
Specialties and state licenses
- Social worker, MassachusettsPrimary
Social workers near John McMahon
Counts of social workers with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
John P. McMahon's patients have a median age of 46
Across all payers, Dmand AI patient panel data puts John McMahon's median patient age at 46, with 39% women.
John McMahon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 46
Patient panel by sex, all payers
- Women39%
- Men61%
Source: Dmand AI Patient Panel Data
Sources for John P. McMahon's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about John P. McMahon
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John P. McMahon's NPI number?
John P. McMahon's NPI number is 1548464092. It was assigned on June 11, 2007, and it is active in the NPI Registry.
What does John P. McMahon specialize in?
John P. McMahon is a social worker in Westborough, Massachusetts. The primary specialty in the NPI Registry is Social Worker (taxonomy code 104100000X).
Where does John P. McMahon practice?
John McMahon practices at 24 Lyman St, Westborough, MA 01581. John McMahon's primary practice is Castlebrook Counseling Services, Inc. in Westborough, Massachusetts. Dmand AI also links John McMahon to 2 group practices and clinics and 1 medical group.
What is John P. McMahon's office phone number?
The practice phone on file for John McMahon is (508) 439-3911.
What is John P. McMahon's medical license number?
John McMahon holds Massachusetts license 213699.
What medical group is John P. McMahon part of?
John McMahon is linked to Reliant Medical Group. Dmand AI links John McMahon to 1 more medical group.
How long has John P. McMahon been practicing?
John McMahon's NPI was assigned in 2007.
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