Michael Siap, D.O.
NPI 1629519764 · Emergency Medicine Physician · Olympia Fields, IL
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Siap, D.O. is a Emergency Medicine Physician provider in Olympia Fields, IL (NPI 1629519764).
Provider details
- NPI number
- 1629519764
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
424 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 192 | $161 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 153 | $110 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 46 | $65 |
| Critical Care, First 30-74 Minutes99291 | 33 | $196 |
Typical Medicare-allowed amounts for these services range $65–$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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cefadroxil | 48 | 47 |
| Ondansetronbrand: Ondansetron Odt | 35 | 35 |
| Doxycycline Hyclate | 34 | 34 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 32 | 32 |
| Prednisone | 29 | 29 |
| Dicyclomine Hcl | 24 | 24 |
| Naproxen | 22 | 22 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-03-08
- Last updated
- 2022-02-03
- Certified
- 2022-02-03
Frequently asked questions
- What is Michael Siap's NPI number?
- Michael Siap's National Provider Identifier (NPI) is 1629519764, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Siap's specialty?
- Michael Siap is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Siap located?
- Michael Siap's practice location on file with NPPES is 20201 Crawford Ave, Olympia Fields, IL 60461-1010.
- What is Michael Siap's phone number?
- The practice phone number listed in the NPPES registry for Michael Siap is (708) 747-4000.
- Does Michael Siap accept Medicare?
- Michael Siap is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Siap's NPI active?
- Yes — Michael Siap's NPI (1629519764) is active in the NPPES registry as of the last update on 2022-02-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.