Cassandra Os, NP
Nurse Practitioner · Berlin, NH
Cassandra Os, NP is a nurse practitioner with a practice address in Berlin, New Hampshire, and NPI 1285258863, issued on May 30, 2020. Check the license with the New Hampshire board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Cassandra Os
- Credential
- NP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- RN2309397 MA
Self-reported in NPPES; status is on the state search - Practice location
- 133 Pleasant St, Berlin, NH 03570
- Phone
- (603) 752-2040
- Enumerated
- May 30, 2020
- Record last updated
- Jun 9, 2026
- Medicare enrollment
- Enrolled (PECOS I20251212002897); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 412 in New Hampshire → Look up another NPI →
Also registered at 133 Pleasant St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Heather Beaudry, APRN, CDCESFamily Nurse Practitioner1770199150
- Apurva BhattFamily Medicine Physician1164478210
- Josee Bourbeau, M.D.Family Medicine Physician1740371368
- Alison Breault, FNP-BCFamily Medicine Physician1063027613
- Christopher Caracciolo, MDFamily Medicine Physician1073171435
- Javier Cardenas, M.D.Family Medicine Physician1134168859
Verify Cassandra Os in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New Hampshire board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average nurse practitioner in 2024
2,336 Medicare Part D claims for 109 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. 39 claims were for opioids.
Most prescribed
- Atorvastatin Calcium144 claims
- Levothyroxine Sodium124 claims
- Gabapentin106 claims
- Omeprazole88 claims
- Eliquis78 claims
- Furosemide63 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Community Clinical Services IncLewiston, ME
- Select Physical Therapy Holdings IncAuburn, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cassandra Os among 412 nurse practitioner records in New Hampshire
Cassandra Os, NP is one of 412 nurse practitioner records with a practice address in New Hampshire. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 71% of them.
- NPI issued2020 · 71% of these records are older, 24% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2020 · median 2017 among the 241 with a school on file
- Record last updated2026 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nurse Practitioner providers in New Hampshire
There are 412 nurse practitioner records in New Hampshire.
All 412 in New Hampshire → Every provider in Berlin → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Margaret Fitzgerald, ANPColebrook, NH 035761952501751
- Britney Bigelow, APRNLittleton, NH 035611497344055
- Cori Elliott, APRN-FNPLittleton, NH 035611861028417
- Sonya Morse, MSN, NP-CLittleton, NH 035611326324138
- Kayla Riley, APRNLittleton, NH 035611851141923
- Gina Bedell, APRNLancaster, NH 035841700164068
- Penny Durgin, ARNPLancaster, NH 035841710964549
- Tammy Lazott, APRNLancaster, NH 035841033515614
Common questions
What is Cassandra Os, NP's NPI number?
Cassandra Os, NP's National Provider Identifier (NPI) is 1285258863, issued on May 30, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Cassandra Os, NP located?
The NPPES record lists a practice address at 133 Pleasant St, Berlin, NH, 03570. Phone: (603) 752-2040. Providers update this record themselves, so call before visiting.
How can I verify Cassandra Os, NP's license?
Search the New Hampshire board that licenses this profession; the NPPES record confirms identity only.
How much does Cassandra Os, NP prescribe under Medicare Part D?
In 2024, Cassandra Os, NP had 2,336 Medicare Part D claims for 109 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.