OA ASSOCIATES, LLC
OA ASSOCIATES, LLC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1003137662, based in O Fallon, IL. It is classified under Orthopaedic Surgery Physician.
Getting there
Here is what surrounds this office in O Fallon, based on OpenStreetMap data collected Sep 7, 2026. Parking is available about 0.23 mi away. The nearest transit stop is 516 ft away, served by East US-50 at Parkview. If you arrive early, there is a coffee shop 0.48 mi away.
Getting here and what is nearby
Transit East US-50 at Park Entrance Place 182 ft ~1 min
Transit East US-50 at Park Entrance Place 279 ft ~2 min
Restaurant DQ Grill & Chill 421 ft ~2 min
Transit East US-50 at Parkview 516 ft ~2 min
Restaurant McDonald's 714 ft ~3 min
Restaurant Hardee's 719 ft ~3 min
Coffee Starbucks 933 ft ~4 min
Parking 0.22 mi ~5 min
Parking 0.22 mi ~5 min
Parking 0.23 mi ~5 min
Coffee The Happy Bakery 0.32 mi ~7 min
601 East 6th Street, O'Fallon 62269
Coffee Sweet Katie Bee's 0.48 mi ~10 min
212 East State Street, O'Fallon 62269
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Orthopaedic Surgery covers
An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system. NUCC Health Care Provider Taxonomy, code 207X00000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1003137662 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Jun 17, 2010 |
| Last updated | Feb 22, 2013 |
| Status | Active |
| Practice address |
800 E HIGHWAY 50 O Fallon, IL 62269 (618) 234-9884 Fax (618) 235-9020 |
| Mailing address |
4500 MEMORIAL DR MEDICAL AFFAIRS CREDENTIALING DEPT Belleville, IL 62226 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 1 | 3 | 7 | 6 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 3 | 5 | 6 | 3 |
Sum = 48 · next multiple of 10 = 50 · check digit = 2 · actual last digit = 2
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.