Cassandra Slemmer, PA-C
NPI 1639604432 · Physician Assistant · Wenatchee, WA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cassandra Slemmer, PA-C is a Physician Assistant provider in Wenatchee, WA (NPI 1639604432).
Provider details
- NPI number
- 1639604432
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- No
- License
- PA60761023 (WA)
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
9 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
89 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 43 | $106 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 24 | $48 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 22 | $77 |
Typical Medicare-allowed amounts for these services range $48–$106 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 116 | 116 |
| Omeprazole | 48 | 22 |
| Rifaximinbrand: Xifaxan | 27 | — |
| Furosemide | 27 | — |
| Spironolactone | 21 | — |
| Ursodiol | 19 | — |
| Nortriptyline Hcl | 15 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-29
- Last updated
- 2023-12-14
- Certified
- 2023-12-14
Frequently asked questions
- What is Cassandra Slemmer's NPI number?
- Cassandra Slemmer's National Provider Identifier (NPI) is 1639604432, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cassandra Slemmer's specialty?
- Cassandra Slemmer is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Cassandra Slemmer located?
- Cassandra Slemmer's practice location on file with NPPES is 820 N Chelan Ave, Wenatchee, WA 98801-2028.
- What is Cassandra Slemmer's phone number?
- The practice phone number listed in the NPPES registry for Cassandra Slemmer is (509) 663-8711.
- Does Cassandra Slemmer accept Medicare?
- Cassandra Slemmer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cassandra Slemmer's NPI active?
- Yes — Cassandra Slemmer's NPI (1639604432) is active in the NPPES registry as of the last update on 2023-12-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.