Karl Stempel, FNP
NPI 1861419566 · Family Nurse Practitioner · Tucson, AZ
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karl Stempel, FNP is a Family Nurse Practitioner provider in Tucson, AZ (NPI 1861419566).
Provider details
- NPI number
- 1861419566
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Male
- Sole proprietor
- No
- License
- AP2226 (AZ)
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
19 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
204 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 58 | $75 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 45 | $92 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 30 | $105 |
| Automated Urinalysis Test81003 | 25 | $2 |
| Detection Test By Immunoassay With Direct Visual Observation for Severe Acute Respiratory Syndrome Coronavirus 2 (covid-19)87811 | 18 | $41 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Doxycycline Monohydrate | 90 | 89 |
| Prednisone | 80 | 77 |
| Cephalexin | 66 | 63 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 54 | 53 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 38 | 38 |
| Cefdinir | 28 | 24 |
| Fluticasone Propionate | 20 | 20 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-17
- Last updated
- 2018-03-30
Frequently asked questions
- What is Karl Stempel's NPI number?
- Karl Stempel's National Provider Identifier (NPI) is 1861419566, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karl Stempel's specialty?
- Karl Stempel is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Karl Stempel located?
- Karl Stempel's practice location on file with NPPES is 4685 E Grant Rd, Tucson, AZ 85712-2618.
- What is Karl Stempel's phone number?
- The practice phone number listed in the NPPES registry for Karl Stempel is (855) 925-4733.
- Does Karl Stempel accept Medicare?
- Karl Stempel is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karl Stempel's NPI active?
- Yes — Karl Stempel's NPI (1861419566) is active in the NPPES registry as of the last update on 2018-03-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.