Cassandra Hartwig, NP
NPI 1215476163 · Nurse Practitioner · Waterloo, WI
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cassandra Hartwig, NP is a Nurse Practitioner provider in Waterloo, WI (NPI 1215476163).
Provider details
- NPI number
- 1215476163
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 7517 (WI)
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 tenure25% of score
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
615 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 201 | $52 |
| Removal of Skin and Tissue, 20.0 Sq Cm Or Less11042 | 187 | $45 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 87 | $64 |
| Removal of Tissue From Wound, 20.0 Sq Cm Or Less97597 | 62 | $28 |
| Removal of Skin and Tissue, Each Additional 20.0 Sq Cm Or Less11045 | 51 | $19 |
| Removal of Muscle And/Or Tissue, 20.0 Sq Cm Or Less11043 | 27 | $113 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Doxycycline Hyclate | 23 | 20 |
| Levofloxacin | 13 | — |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 13 | 13 |
| Cephalexin | 11 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$21 across 1 record (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
Registry dates
- Enumerated
- 2017-02-13
- Last updated
- 2023-06-23
- Certified
- 2023-06-23
Frequently asked questions
- What is Cassandra Hartwig's NPI number?
- Cassandra Hartwig's National Provider Identifier (NPI) is 1215476163, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cassandra Hartwig's specialty?
- Cassandra Hartwig is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Cassandra Hartwig located?
- Cassandra Hartwig's practice location on file with NPPES is 537 Mckay Way, Waterloo, WI 53594-1530.
- What is Cassandra Hartwig's phone number?
- The practice phone number listed in the NPPES registry for Cassandra Hartwig is (608) 206-4364.
- Does Cassandra Hartwig accept Medicare?
- Cassandra Hartwig is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cassandra Hartwig's NPI active?
- Yes — Cassandra Hartwig's NPI (1215476163) is active in the NPPES registry as of the last update on 2023-06-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.