Karen Sadler, ARNP
NPI 1891396529 · Nurse Practitioner · Waterloo, IA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Sadler, ARNP is a Nurse Practitioner provider in Waterloo, IA (NPI 1891396529).
Provider details
- NPI number
- 1891396529
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- ARNP
- Sex
- Female
- Sole proprietor
- No
- License
- A161407 (IA)
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
5 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
4,100 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) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 1,422 | $5 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 1,096 | $71 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 414 | $44 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 377 | $101 |
| Shaving of Skin Growth of Face, Ears, Eyelids, Nose, Lips, Or Mouth, 0.5 Cm Or Less11310 | 159 | $82 |
| Shaving of Skin Growth of Body, Arms, Or Legs, 0.5 Cm Or Less11300 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone Propionate | 359 | 123 |
| Montelukast Sodium | 233 | 42 |
| Azelastine Hcl | 137 | 54 |
| Ipratropium Bromide | 109 | 48 |
| Famotidine | 90 | 18 |
| Ketoconazole | 85 | 48 |
| Triamcinolone Acetonide | 73 | 60 |
| Olopatadine Hcl | 48 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$80 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
Registry dates
- Enumerated
- 2020-11-09
- Last updated
- 2022-02-07
- Certified
- 2022-02-07
Frequently asked questions
- What is Karen Sadler's NPI number?
- Karen Sadler's National Provider Identifier (NPI) is 1891396529, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Sadler's specialty?
- Karen Sadler is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Karen Sadler located?
- Karen Sadler's practice location on file with NPPES is 2515 Cyclone Dr Ste B, Waterloo, IA 50701-9746.
- What is Karen Sadler's phone number?
- The practice phone number listed in the NPPES registry for Karen Sadler is (319) 888-8044.
- Does Karen Sadler accept Medicare?
- Karen Sadler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Sadler's NPI active?
- Yes — Karen Sadler's NPI (1891396529) is active in the NPPES registry as of the last update on 2022-02-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.