MARY ELIZABETH KARLAN LCSW
NPI 1871976431
Social Worker in Old Greenwich, CT
About Mary Elizabeth Karlan Lcsw NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY ELIZABETH KARLAN LCSW (NPI 1871976431) is an individual social worker in Old Greenwich, Connecticut, licensed in Connecticut (001369) and active in the NPI registry since July 2015. She is enrolled in Medicare PECOS and is a graduate of Other (2012).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mary Elizabeth Karlan Lcsw is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Mary Karlan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oak Bluffs, MA 02557
- Reassigned Medicare billing, Massachusetts enrollment
- 29 clinicians in this Medicare group
Miami, FL 33130
- Reassigned Medicare billing, Connecticut, Florida, Massachusetts and New York enrollments
- 613 clinicians in this Medicare group
San Jose, CA 95113
- Reassigned Medicare billing, California enrollment
- 3,139 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Mary Karlan's NPI number?
The NPI number for Mary Karlan is 1871976431. It was assigned to this individual provider in the NPPES registry on July 1, 2015. The provider is also known as Mary Elizabeth Karlan Lcsw.
Where is Mary Karlan located?
Mary Karlan practices at 177 Sound Beach Ave Ste 6, Old Greenwich, CT 06870. The listed phone number is (203) 493-0937.
What is Mary Karlan's specialty?
The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.
Is Mary Karlan enrolled in Medicare?
Yes. Mary Karlan is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Mary Karlan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Karlan reassigns Medicare benefits to 3 organizations: Martha's Vineyard Community Services, Inc. (Oak Bluffs, MA), Grow Healthcare Group PA (Miami, FL) and Grow Healthcare Group PC (San Jose, CA). Each 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 Mary Karlan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Karlan accept?
Health plans from Anthem Blue Cross and Blue Shield, Cigna HealthCare of Florida, Inc., Cigna Healthcare, Harvard Pilgrim Health Care and UnitedHealthcare list Mary Karlan 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 Mary Karlan was last updated on October 22, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Mary Elizabeth Karlan, LCSW · NPI 1871976431
Social Worker provider in Old Greenwich, Connecticut. Individual provider, active in the CMS NPPES registry since July 1, 2015.
## Identity
- **NPI:** 1871976431 (Entity type: Individual)
- **Enumerated:** July 1, 2015
- **Primary specialty:** Social Worker · taxonomy 104100000X
- **State license:** 001369 (Connecticut)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 177 SOUND BEACH AVE STE 6, Old Greenwich, CT 06870-1740
- **Phone:** (203) 493-0937
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Martha's Vineyard Community Services, Inc. (NPI 1659387074, Oak Bluffs, MA); Grow Healthcare Group PA (NPI 1245845932, Miami, FL); Grow Healthcare Group PC (NPI 1154994846, San Jose, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** October 22, 2020
---
Source: [NPI Profile](https://npiprofile.com/npi/1871976431) · Data from the CMS NPPES public registry.