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MRS. MARIA FRASSINELLI SIERRA LCSW
NPI 1528839305
Social Worker - Clinical in Milford, CT

Active since January 11, 2024PECOS EnrolledAccepts Medicare Assignment
415 BOSTON POST RD STE 3-1098, MILFORD, CT 06460(860) 428-4808 Get Directions Write a Review

NPPES record last updated: November 23, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Mrs. Maria Frassinelli Sierra Lcsw NPPES

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

MRS. MARIA FRASSINELLI SIERRA LCSW (NPI 1528839305) is an individual clinical provider in Milford, Connecticut, licensed in Connecticut (006023) and active in the NPI registry since January 2024. She is enrolled in Medicare PECOS and is a graduate of Other (1998).

NPPES Registry Identity

NPI1528839305
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMRS. MARIA FRASSINELLI SIERRACredential: LCSW
Location Address415 BOSTON POST RD STE 3-1098Milford, CT 06460-2578
Mailing Address415 Boston Post Rd Ste 3-1098Milford, CT 06460-2578 · (860) 428-4808
Phone(860) 428-4808
Sole ProprietorYes
Medical School CMSOtherGraduated 1998
Enumeration DateJanuary 11, 2024
Last NPPES UpdateNovember 23, 2025
NPPES CertifiedNovember 23, 2025
✔ NPI 1528839305 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 CT · 006023
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.
415 BOSTON POST RD STE 3-1098, Milford, CT 06460
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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, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mrs. Maria Frassinelli Sierra 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 ID5496936502
PECOS Enrollment IDI20241029000849
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 Maria Sierra reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Kozey Greene Wellness
68 mi
Professional
77 KOZEY RD
Eastford, CT 06242
  • Reassigned Medicare billing, Connecticut enrollment
  • 3 clinicians in this Medicare group
NPI 1649863705 (860) 933-8587

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06460 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 $60.82 – $183.10
Typical copayment $0.00 (range $15.20 – $45.77)
Most-billed visit code NA
Established Patient
$75.55 typical visit price
range $19.76 – $149.26
Typical copayment $18.88 (range $4.94 – $37.31)
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.

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 Maria Sierra's NPI number?

The NPI number for Maria Sierra is 1528839305. It was assigned to this individual provider in the NPPES registry on January 11, 2024.

Where is Maria Sierra located?

Maria Sierra practices at 415 Boston Post Rd Ste 3-1098, Milford, CT 06460. The listed phone number is (860) 428-4808.

What is Maria Sierra's specialty?

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

Is Maria Sierra enrolled in Medicare?

Yes. Maria Sierra 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 Maria Sierra's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Maria Sierra reassigns Medicare benefits to Kozey Greene Wellness (Eastford, CT). 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 Maria Sierra's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Maria Sierra accept?

Health plans from Harvard Pilgrim Health Care list Maria Sierra 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 Maria Sierra was last updated on November 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.