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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.

HOLLY B SLONINA LCSW
NPI 1427688324
Social Worker in Lewiston, ME

Active since January 20, 2020PECOS EnrolledAccepts Medicare Assignment
76 HIGH ST FL 1, LEWISTON, ME 04240(207) 795-2800(207) 755-3474 Get Directions Write a Review

NPPES record last updated: October 13, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Oct 13, 2026, Mar 10, 2020, Jan 20, 2020 (3 updates tracked since 2020).

About Holly B Slonina Lcsw NPPES

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

HOLLY B SLONINA LCSW (NPI 1427688324) is an individual social worker in Lewiston, Maine, licensed in Maine (LC20899) and active in the NPI registry since January 2020. She is enrolled in Medicare PECOS and is a graduate of Other (2019).

NPPES Registry Identity

NPI1427688324
Entity TypeIndividualFemale
Primary Taxonomy104100000X
Provider Legal NameHOLLY B SLONINACredential: LCSW
Location Address76 HIGH ST FL 1Lewiston, ME 04240-7649
Mailing Address76 High St Fl 1Lewiston, ME 04240-7649 · (207) 795-2800
Phone(207) 795-2800
Fax(207) 755-3474
Sole ProprietorNo
Medical School CMSOtherGraduated 2019
Enumeration DateJanuary 20, 2020
Last NPPES UpdateOctober 13, 20263 updates tracked since enumeration
NPPES CertifiedOctober 13, 2026
✔ NPI 1427688324 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 ME · LC20899
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.
76 HIGH ST FL 1, Lewiston, ME 04240
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Other Names 1

Former Name (1)Holly Slonina

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

Holly B Slonina Lcsw 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 ID5496237950
PECOS Enrollment IDI20260304001109
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 Holly Slonina reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Kennebec Valley Mental Health Center
43 mi
Mental Health (Including Community Mental Health Center)
67 EUSTIS PKWY
Waterville, ME 04901
  • Reassigned Medicare billing, Maine enrollment
  • 92 clinicians in this Medicare group
NPI 1679504864 (207) 873-2136

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 2

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

MRS. REBECCA SCHWEIKERT GREENLEAF FNP
Nurse Practitioner (Family)
76 HIGH ST FL 1
LEWISTON, ME 04240
Androscoggin County (207) 795-2800
KARA CALLAHAN MD
Family Medicine
76 HIGH ST FL 1
LEWISTON, ME 04240
Androscoggin County (207) 795-2800

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 Holly Slonina's NPI number?

The NPI number for Holly Slonina is 1427688324. It was assigned to this individual provider in the NPPES registry on January 20, 2020.

Where is Holly Slonina located?

Holly Slonina practices at 76 High St Fl 1, Lewiston, ME 04240. The listed phone number is (207) 795-2800.

What is Holly Slonina's specialty?

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

Is Holly Slonina enrolled in Medicare?

Yes. Holly Slonina 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 Holly Slonina's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Holly Slonina reassigns Medicare benefits to Kennebec Valley Mental Health Center (Waterville, ME). 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 Holly Slonina's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Holly Slonina was last updated on October 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.