Mark Oas, D.C.
NPI 1487648093 · Chiropractor · Eau Claire, WI
Enrolled with Medicare as Practitioner - Chiropractic · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Oas, D.C. is a Chiropractor provider in Eau Claire, WI (NPI 1487648093).
Provider details
- NPI number
- 1487648093
- Entity type
- Individual
- Primary specialty
- ChiropractorChiropractic Providers
- Credential
- D.C.
- Sex
- Male
- Sole proprietor
- No
- License
- 3823-012 (WI)
Specialties & taxonomies
Chiropractic Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
418 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 | 418 | $38 |
Typical Medicare-allowed amounts for these services range $38–$38 (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
- 2005-09-09
- Last updated
- 2011-06-22
Frequently asked questions
- What is Mark Oas's NPI number?
- Mark Oas's National Provider Identifier (NPI) is 1487648093, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Oas's specialty?
- Mark Oas is listed in the NPPES registry with a primary specialty of Chiropractor (Chiropractic Providers).
- Where is Mark Oas located?
- Mark Oas's practice location on file with NPPES is 1740 Westgate Rd, Eau Claire, WI 54703-4963.
- What is Mark Oas's phone number?
- The practice phone number listed in the NPPES registry for Mark Oas is (715) 552-7889.
- Does Mark Oas accept Medicare?
- Mark Oas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Oas's NPI active?
- Yes — Mark Oas's NPI (1487648093) is active in the NPPES registry as of the last update on 2011-06-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.