Erik Gierahn, M.D.
NPI 1255368189 · Emergency Medicine Physician · West Bend, WI
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Provider details
- NPI number
- 1255368189
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 50958 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
582 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 252 | $8 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 157 | $161 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 117 | $111 |
| Critical Care, First 30-74 Minutes99291 | 33 | $196 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 23 | $66 |
Typical Medicare-allowed amounts for these services range $8–$196 (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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 25 | 25 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 23 | 23 |
| Cephalexin | 20 | 20 |
| Doxycycline Hyclate | 19 | 19 |
| Cefdinir | 18 | 18 |
| Ondansetronbrand: Ondansetron Odt | 17 | 17 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 14 |
Practice location
Mailing address
Additional practice locations (3)
- 15107 Vanowen StVan Nuys, CA 91405-4542Phone: (818) 782-6600
- W180n8085 Town Hall RdMenomonee Falls, WI 53051-3518Phone: (262) 251-1000Fax: (262) 518-5052
- 4805 S Moorland RdNew Berlin, WI 53151-7401Phone: (262) 798-7200Fax: (262) 798-7271
Registry dates
- Enumerated
- 2006-06-27
- Last updated
- 2020-09-02
- Certified
- 2020-09-02
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.