Cassandra Os, NP
NPI 1285258863 · Nurse Practitioner · West Springfield, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cassandra Os, NP is a Nurse Practitioner provider in West Springfield, MA (NPI 1285258863).
Provider details
- NPI number
- 1285258863
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- RN2309397 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
228 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 148 | $63 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 42 | $92 |
| Initial Nursing Facility Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99304 | 38 | $68 |
Typical Medicare-allowed amounts for these services range $63–$92 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 60 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 144 | 24 |
| Levothyroxine Sodium | 124 | 20 |
| Gabapentin | 106 | 15 |
| Omeprazole | 88 | 12 |
| Apixabanbrand: Eliquis | 78 | 12 |
| Furosemide | 63 | 13 |
| Amlodipine Besylate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-05-30
- Last updated
- 2020-05-30
- Certified
- 2020-05-30
Frequently asked questions
- What is Cassandra Os's NPI number?
- Cassandra Os's National Provider Identifier (NPI) is 1285258863, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cassandra Os's specialty?
- Cassandra Os is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Cassandra Os located?
- Cassandra Os's practice location on file with NPPES is 103 Myron St Ste a, West Springfield, MA 01089-1485.
- What is Cassandra Os's phone number?
- The practice phone number listed in the NPPES registry for Cassandra Os is (888) 964-6681.
- Does Cassandra Os accept Medicare?
- Cassandra Os is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cassandra Os's NPI active?
- Yes — Cassandra Os's NPI (1285258863) is active in the NPPES registry as of the last update on 2020-05-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.