Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

CASSANDRA OS NP
NPI 1285258863
Nurse Practitioner in Berlin, NH

Q: What is Cassandra Os's NPI number?

The NPI number for Cassandra Os is 1285258863. It was assigned to this individual provider in the NPPES registry on May 30, 2020.

Q: What is Cassandra Os's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Q: When was this NPI record last updated?

The NPPES record for Cassandra Os was last updated on June 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 58 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.

Active since May 30, 2020PECOS EnrolledAccepts Medicare Assignment

133 PLEASANT ST, BERLIN, NH 03570(603) 752-2040 Get Directions Write a Review

NPPES record last updated: June 9, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About Cassandra Os Np NPPES

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

CASSANDRA OS NP (NPI 1285258863) is an individual nurse practitioner in Berlin, New Hampshire, licensed in Massachusetts (RN2309397) and active in the NPI registry since May 2020. She is enrolled in Medicare PECOS, is affiliated with St Mary's Regional Medical Center, and maintains a secondary practice location in West Springfield.

NPPES Registry Identity

NPI1285258863

Entity TypeIndividualFemale

Primary Taxonomy363L00000X

Provider Legal NameCASSANDRA OSCredential: NP

Location Address133 PLEASANT STBerlin, NH 03570-2006

Mailing Address100 Crossing Blvd Ste 300Framingham, MA 01702-5555 · (617) 964-6681 · Fax (339) 686-2561

Phone(603) 752-2040

Sole ProprietorNo

Medical School CMSOtherGraduated 2020

Enumeration DateMay 30, 2020

Last NPPES UpdateJune 9, 2026

NPPES CertifiedJune 9, 2026

✔ NPI 1285258863 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363L00000X

License✔ Licensed in MA · RN2309397

Definition

(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

133 PLEASANT ST, Berlin, NH 03570

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Secondary Practice Location 1

Location 1103 Myron St Ste AWest Springfield, MA 01089-1485 · Phone (888) 964-6681 · Fax (888) 662-0859

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Cassandra Os Np 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 ID9133548522

PECOS Enrollment IDI20251212002897

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.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308

A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.

148 services60 patients

Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes 99309

A follow-up nursing facility visit per day is a daily check-in by a healthcare professional. This 25-minute visit typically involves monitoring your health progress, addressing any concerns, and adjusting treatment plans as necessary. It's a vital part of ensuring your ongoing wellbeing.

42 services31 patients

Initial nursing facility care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99304

An initial nursing facility visit is a daily check-up to monitor your health status. This service, lasting typically 25 minutes, involves a nurse assessing your overall wellbeing, discussing concerns, and updating your care plan as needed.

38 services38 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

St Mary's Regional Medical Center

Acute Care Hospitals · Lewiston, ME

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number200034

Location93 Campus Avenue - PO Box 291Lewiston, ME 04243 · Androscoggin County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 03570 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

$89.14 typical visit price

range $57.75 – $174.26

Typical copayment $22.28 (range $14.43 – $43.56)

Most-billed visit code 99203

Established Patient

$101.54 typical visit price

range $18.70 – $142.15

Typical copayment $25.38 (range $4.67 – $35.53)

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.

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Other Providers at the Same Location NPPES 20

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

MICHAEL STEPHEN COMISAC III DO

Family Medicine