Cassandra Niemi, MD
NPI 1861781767 · Gynecologic Oncology Physician · Portland, OR
Enrolled with Medicare as Practitioner - Gynecological Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cassandra Niemi, MD is a Gynecologic Oncology Physician provider in Portland, OR (NPI 1861781767).
Provider details
- NPI number
- 1861781767
- Entity type
- Individual
- Primary specialty
- Gynecologic Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD186977 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
15 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
226 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 58 | $132 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 52 | $17 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 39 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 33 | $66 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 27 | — |
| Oxycodone Hcl | 19 | 17 |
| Prochlorperazine Maleate | 17 | 13 |
| Ondansetronbrand: Ondansetron Odt | 14 | 13 |
| Estradiol | 12 | — |
| Dexamethasone | 11 | 11 |
| Olaparibbrand: Lynparza | 11 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$376 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 9555 Sw Barnes Rd Ste 150Portland, OR 97225-6691Phone: (503) 297-7403Fax: (503) 384-9908
Registry dates
- Enumerated
- 2011-03-31
- Last updated
- 2021-03-22
- Certified
- 2021-03-22
Frequently asked questions
- What is Cassandra Niemi's NPI number?
- Cassandra Niemi's National Provider Identifier (NPI) is 1861781767, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cassandra Niemi's specialty?
- Cassandra Niemi is listed in the NPPES registry with a primary specialty of Gynecologic Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Cassandra Niemi located?
- Cassandra Niemi's practice location on file with NPPES is 4805 Ne Glisan St Ste 11n, Portland, OR 97213-2933.
- What is Cassandra Niemi's phone number?
- The practice phone number listed in the NPPES registry for Cassandra Niemi is (503) 215-2075.
- Does Cassandra Niemi accept Medicare?
- Cassandra Niemi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cassandra Niemi's NPI active?
- Yes — Cassandra Niemi's NPI (1861781767) is active in the NPPES registry as of the last update on 2021-03-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.