William Register, D.O.
NPI 1912384306 · Critical Care Medicine (Internal Medicine) Physician · Elk Grove Village, IL
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Register, D.O. is a Critical Care Medicine (Internal Medicine) Physician provider in Elk Grove Village, IL (NPI 1912384306).
Provider details
- NPI number
- 1912384306
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 036155248 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
11 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
393 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 216 | $221 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 48 | $131 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 29 | $122 |
| Insertion of Non-Tunneled Central Venous Tube for Infusion (5 Years Or Older)36556 | 28 | $90 |
| Ultrasonic Guidance for Blood Vessel Access76937 | 27 | $15 |
| Emergent Insertion of Breathing Tube Into Windpipe Using an Endoscope31500 | 17 | $152 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$20 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-05-05
- Last updated
- 2024-10-11
- Certified
- 2024-10-11
Frequently asked questions
- What is William Register's NPI number?
- William Register's National Provider Identifier (NPI) is 1912384306, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Register's specialty?
- William Register is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is William Register located?
- William Register's practice location on file with NPPES is 800 Biesterfield Rd Ste 510, Elk Grove Village, IL 60007-3367.
- What is William Register's phone number?
- The practice phone number listed in the NPPES registry for William Register is (847) 981-3660.
- Does William Register accept Medicare?
- William Register is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Register's NPI active?
- Yes — William Register's NPI (1912384306) is active in the NPPES registry as of the last update on 2024-10-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.