William Grehan, MD
NPI 1417961061 · Anesthesiology Physician · Melrose Park, IL
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Grehan, MD is a Anesthesiology Physician provider in Melrose Park, IL (NPI 1417961061).
Provider details
- NPI number
- 1417961061
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036-082615 (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 tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
304 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) |
|---|---|---|
| Injection of Anesthetic Agent And/Or Steroid Into Thigh Nerve (femoral Nerve)64447 | 74 | $54 |
| Anesthesia for Procedure for Total Knee Joint Replacement01402 | 65 | $169 |
| Injection of Anesthetic Agent And/Or Steroid Into Arm Nerve Bundle (brachial Plexus)64415 | 47 | $67 |
| Anesthesia for Total Hip Replacement01214 | 42 | $189 |
| Injection of Anesthetic Agent And/Or Steroid Into Knee Nerve Branch Using Imaging Guidance64454 | 19 | $86 |
| Injection of Anesthetic Agent And/Or Steroid Into Other Nerve Or Branch64450 | 18 | $32 |
Practice location
Mailing address
Additional practice locations (1)
- 4440 W 95th StOak Lawn, IL 60453-2600Phone: (708) 684-8000
Registry dates
- Enumerated
- 2006-07-28
- Last updated
- 2025-04-22
- Certified
- 2025-04-22
Frequently asked questions
- What is William Grehan's NPI number?
- William Grehan's National Provider Identifier (NPI) is 1417961061, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Grehan's specialty?
- William Grehan is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Grehan located?
- William Grehan's practice location on file with NPPES is 701 W North Ave, Melrose Park, IL 60160-1612.
- What is William Grehan's phone number?
- The practice phone number listed in the NPPES registry for William Grehan is (708) 681-3202.
- Does William Grehan accept Medicare?
- William Grehan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Grehan's NPI active?
- Yes — William Grehan's NPI (1417961061) is active in the NPPES registry as of the last update on 2025-04-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.