Gregory Spielbauer, MD
NPI 1609843663 · Internal Medicine Physician · Brookfield, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Spielbauer, MD is a Internal Medicine Physician provider in Brookfield, WI (NPI 1609843663).
Provider details
- NPI number
- 1609843663
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 41867 (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
879 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 | 301 | $85 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 229 | $120 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 217 | $122 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 46 | $13 |
| Administration of Pneumococcal VaccineG0009 | 25 | $30 |
| X-Ray of Chest, 2 Views71046 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 135 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 941 | 297 |
| Amlodipine Besylate | 680 | 210 |
| Rosuvastatin Calcium | 567 | 164 |
| Lisinopril | 539 | 149 |
| Olmesartan Medoxomil | 468 | 138 |
| Levothyroxine Sodium | 403 | 118 |
| Omeprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-08
- Last updated
- 2011-08-22
Frequently asked questions
- What is Gregory Spielbauer's NPI number?
- Gregory Spielbauer's National Provider Identifier (NPI) is 1609843663, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Spielbauer's specialty?
- Gregory Spielbauer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Spielbauer located?
- Gregory Spielbauer's practice location on file with NPPES is 17000 W North Ave, Brookfield, WI 53005-4423.
- What is Gregory Spielbauer's phone number?
- The practice phone number listed in the NPPES registry for Gregory Spielbauer is (262) 782-4270.
- Does Gregory Spielbauer accept Medicare?
- Gregory Spielbauer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Spielbauer's NPI active?
- Yes — Gregory Spielbauer's NPI (1609843663) is active in the NPPES registry as of the last update on 2011-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.