Zachary Siehoff, D.O.
NPI 1639437999 · Hospitalist Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zachary Siehoff, D.O. is a Hospitalist Physician provider in Milwaukee, WI (NPI 1639437999).
Provider details
- NPI number
- 1639437999
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 63885 (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
14 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
508 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 324 | $108 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 81 | $105 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 66 | $45 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 37 | $160 |
Typical Medicare-allowed amounts for these services range $45–$160 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 28 | 13 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 27 | 11 |
| Pantoprazole Sodium | 26 | 21 |
| Metoprolol Succinate | 25 | 13 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 13 | 13 |
| Amiodarone Hcl | 12 | — |
Practice location
Mailing address
Additional practice locations (2)
- 1775 Ballard RdPark Ridge, IL 60068-1005Phone: (847) 318-9340
- 1775 Ballard RdPark Ridge, IL 60068-1005Phone: (847) 318-9340
Registry dates
- Enumerated
- 2012-04-24
- Last updated
- 2024-07-12
- Certified
- 2024-07-12
Frequently asked questions
- What is Zachary Siehoff's NPI number?
- Zachary Siehoff's National Provider Identifier (NPI) is 1639437999, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zachary Siehoff's specialty?
- Zachary Siehoff is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Zachary Siehoff located?
- Zachary Siehoff's practice location on file with NPPES is 2900 W Oklahoma Ave, Milwaukee, WI 53215.
- What is Zachary Siehoff's phone number?
- The practice phone number listed in the NPPES registry for Zachary Siehoff is (414) 649-6000.
- Does Zachary Siehoff accept Medicare?
- Zachary Siehoff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zachary Siehoff's NPI active?
- Yes — Zachary Siehoff's NPI (1639437999) is active in the NPPES registry as of the last update on 2024-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.