William O'Brien, D.C.
NPI 1235217795 · Chiropractor · Glendale Heights, IL
Enrolled with Medicare as Practitioner - Chiropractic · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William O'Brien, D.C. is a Chiropractor provider in Glendale Heights, IL (NPI 1235217795).
Provider details
- NPI number
- 1235217795
- Entity type
- Individual
- Primary specialty
- ChiropractorChiropractic Providers
- Credential
- D.C.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Chiropractic Providers
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
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,060 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) |
|---|---|---|
| Chiropractic Manipulative Treatment, 3-4 Spinal Regions98941 | 1,060 | $40 |
Typical Medicare-allowed amounts for these services range $40–$40 (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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2007-07-08
Frequently asked questions
- What is William O'Brien's NPI number?
- William O'Brien's National Provider Identifier (NPI) is 1235217795, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William O'Brien's specialty?
- William O'Brien is listed in the NPPES registry with a primary specialty of Chiropractor (Chiropractic Providers).
- Where is William O'Brien located?
- William O'Brien's practice location on file with NPPES is 320 E Army Trail Rd, Glendale Heights, IL 60139-1757.
- What is William O'Brien's phone number?
- The practice phone number listed in the NPPES registry for William O'Brien is (630) 529-6111.
- Does William O'Brien accept Medicare?
- William O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William O'Brien's NPI active?
- Yes — William O'Brien's NPI (1235217795) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.