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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.

MRS. MARISSA L OSORIO WHNP
NPI 1770273591
Nurse Practitioner - Women's Health in Winchester, MA

Active since May 15, 2023PECOS Enrolled
1021 MAIN ST STE 102, WINCHESTER, MA 01890(781) 721-4701 Get Directions Write a Review

NPPES record last updated: October 13, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 13, 2026, Jul 11, 2026, Nov 20, 2025 and 2 more (5 updates tracked since 2023).

About Mrs. Marissa L Osorio Whnp NPPES

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

MRS. MARISSA L OSORIO WHNP (NPI 1770273591) is an individual women's health provider in Winchester, Massachusetts, licensed in Massachusetts (RN2328964) and active in the NPI registry since May 2023. She is enrolled in Medicare PECOS and maintains a secondary practice location in Boston.

NPPES Registry Identity

NPI1770273591
Entity TypeIndividualFemale
Primary Taxonomy363LW0102X
Provider Legal NameMRS. MARISSA L OSORIOCredential: WHNP
Location Address1021 MAIN ST STE 102Winchester, MA 01890-1971
Mailing Address100 Cambridge StBoston, MA 02114-2509 · (888) 731-8994
Phone(781) 721-4701
Sole ProprietorYes
Enumeration DateMay 15, 2023
Last NPPES UpdateOctober 13, 20265 updates tracked since enumeration
NPPES CertifiedOctober 13, 2026
✔ NPI 1770273591 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Women's HealthPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LW0102X
License✔ Licensed in MA · RN2328964
1021 MAIN ST STE 102, Winchester, MA 01890
Open in Google Maps ↗

Secondary Practice Location 1

Location 1100 Cambridge StBoston, MA 02114-2509 · Phone (888) 731-8994

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mrs. Marissa L Osorio Whnp 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 Marissa Osorio reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Health Imperatives Inc.
21 mi
Family Planning, Non-Surgical
210 WINTER ST, SUITE 204
Weymouth, MA 02188
  • Reassigned Medicare billing, Massachusetts enrollment
  • 25 clinicians in this Medicare group
NPI 1093859761 (781) 335-1404

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 01890 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
$97.64 typical visit price
range $63.72 – $189.86
Typical copayment $24.41 (range $15.93 – $47.46)
Most-billed visit code 99203
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

KYLA MALONE RN, NP
Nurse Practitioner (Family)
1021 MAIN ST STE 102
WINCHESTER, MA 01890
Middlesex County (781) 721-4701
ASHLEY NICOLE ZAGANJORI NP-C
Nurse Practitioner (Family)
1021 MAIN ST STE 102
WINCHESTER, MA 01890
Middlesex County (781) 729-1021

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 Marissa Osorio's NPI number?

The NPI number for Marissa Osorio is 1770273591. It was assigned to this individual provider in the NPPES registry on May 15, 2023.

Where is Marissa Osorio located?

Marissa Osorio practices at 1021 Main St Ste 102, Winchester, MA 01890. The listed phone number is (781) 721-4701.

What is Marissa Osorio's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Women's Health, with taxonomy code 363LW0102X.

Is Marissa Osorio enrolled in Medicare?

Yes. Marissa Osorio is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Marissa Osorio's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marissa Osorio reassigns Medicare benefits to Health Imperatives Inc. (Weymouth, 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 Marissa Osorio'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 Marissa Osorio 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 12 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.