Steven Kagen, M.D.
NPI 1235175589 · Allergy Physician · Appleton, WI
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Kagen, M.D. is a Allergy Physician provider in Appleton, WI (NPI 1235175589).
Provider details
- NPI number
- 1235175589
- Entity type
- Individual
- Primary specialty
- Allergy PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 22210-020 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 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
167 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 | 104 | $120 |
| Test to Measure the Level of Nitric Oxide Gas95012 | 35 | $18 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 28 | $156 |
Typical Medicare-allowed amounts for these services range $18–$156 (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 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Montelukast Sodium | 62 | 13 |
| Fluticasone Propion/Salmeterolbrand: Fluticasone-Salmeterol | 54 | 14 |
| Fluticasone Propionate | 47 | 14 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 42 | 20 |
| Ipratropium Bromide | 38 | 16 |
| Famotidine | 31 | 11 |
| Omalizumabbrand: Xolair | 31 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-22
- Last updated
- 2026-04-24
- Certified
- 2026-04-24
Frequently asked questions
- What is Steven Kagen's NPI number?
- Steven Kagen's National Provider Identifier (NPI) is 1235175589, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Kagen's specialty?
- Steven Kagen is listed in the NPPES registry with a primary specialty of Allergy Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Kagen located?
- Steven Kagen's practice location on file with NPPES is 100 W Lawrence St Ste 410, Appleton, WI 54911-5754.
- What is Steven Kagen's phone number?
- The practice phone number listed in the NPPES registry for Steven Kagen is (920) 739-9100.
- Does Steven Kagen accept Medicare?
- Steven Kagen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Kagen's NPI active?
- Yes — Steven Kagen's NPI (1235175589) is active in the NPPES registry as of the last update on 2026-04-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.