Registry data as of Aug 27, 2026

Oa Associates

Oa Associates holds 12 active organization NPIs in the federal registry, with practice locations in 6 Illinois cities. 9 list orthopaedic surgery physician as their primary taxonomy; each location can bill under its own NPI.

CMS NPPES registry, file of Aug 9, 2026 · legal names grouped after punctuation and "LLC" are removed · method · Verify with CMS →

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Search the organization with your city to find the NPI for the location you visit or bill.

Find a location's NPI

Belleville has the most NPIs, 6

  1. Belleville6
  2. O Fallon2
  3. Chester1
  4. Columbia1
  5. Nashville1
  6. Shiloh1

Source: CMS NPPES monthly file of Aug 9, 2026, organization NPIs by practice city.

Most NPIs were issued in 2010 and 2013

Oa Associates NPIs by year issued2010: 6, 2011: 1, 2012: 0, 2013: 2, 2014: 0, 2015: 1, 2016: 1, 2017: 1024620102011201220132014201520162017621111
Oa Associates NPIs by year issued2010: 6, 2011: 1, 2012: 0, 2013: 2, 2014: 0, 2015: 1, 2016: 1, 2017: 1024620102011201220132014201520162017621111
Oa Associates NPIs by year issued2010: 6, 2011: 1, 2012: 0, 2013: 2, 2014: 0, 2015: 1, 2016: 1, 2017: 1024620102011201220132014201520162017621111

Source: CMS NPPES, enumeration dates.

6 NPIs were issued in 2010 alone, more than in any other year; none in 2 of the years between.

Belleville locations

The city with the most Oa Associates NPIs. The full list of all 12 follows.

NPILocationPrimary taxonomyIssued
16798962604700 MEMORIAL DRIVE STE. 340, BellevilleOrthopaedic Surgery PhysicianMar 10, 2010
10132385344700 MEMORIAL DRIVE STE. 340, BellevilleOrthopaedic Surgery PhysicianJun 18, 2010
19122112024700 MEMORIAL DRIVE STE. 350, BellevilleSports Medicine (Internal Medicine) PhysicianJul 29, 2010
11041327524700 MEMORIAL DRIVE STE. 340, BellevilleOrthopaedic Hand Surgery PhysicianAug 20, 2010
16192464854700 MEMORIAL DR STE. 340, BellevilleOrthopaedic Surgery PhysicianDec 22, 2011
16496463324700 MEMORIAL DR SUITE 350, BellevilleOrthopaedic Surgery PhysicianAug 17, 2015
All 12 locations, by city
NPILocationPrimary taxonomyIssued
16798962604700 MEMORIAL DRIVE STE. 340, BellevilleOrthopaedic Surgery PhysicianMar 10, 2010
10132385344700 MEMORIAL DRIVE STE. 340, BellevilleOrthopaedic Surgery PhysicianJun 18, 2010
19122112024700 MEMORIAL DRIVE STE. 350, BellevilleSports Medicine (Internal Medicine) PhysicianJul 29, 2010
11041327524700 MEMORIAL DRIVE STE. 340, BellevilleOrthopaedic Hand Surgery PhysicianAug 20, 2010
16192464854700 MEMORIAL DR STE. 340, BellevilleOrthopaedic Surgery PhysicianDec 22, 2011
16496463324700 MEMORIAL DR SUITE 350, BellevilleOrthopaedic Surgery PhysicianAug 17, 2015
15182723191900 STATE ST, ChesterOrthopaedic Hand Surgery PhysicianAug 17, 2010
1588189419200 ADMIRAL TROST RD, ColumbiaOrthopaedic Surgery PhysicianAug 11, 2017
11749612701245 S MILL ST, NashvilleOrthopaedic Surgery PhysicianJun 11, 2013
1003137662800 E HIGHWAY 50, O FallonOrthopaedic Surgery PhysicianJun 17, 2010
1649618554310 N SEVEN HILLS RD, O FallonOrthopaedic Surgery PhysicianJun 13, 2013
14779176561404 CROSS ST 2ND FLOOR SUITE 2941, ShilohOrthopaedic Surgery PhysicianApr 13, 2016

Related names

Checking an organization

  1. Match the NPI to the exact location you will visit or bill; each location can have its own.
  2. Confirm the business entity with the secretary of state.
  3. Check the HHS-OIG exclusion list for the organization and its owners.
  4. Verify each clinician you will see on their own record and with the state license search.

Common questions

Why does Oa Associates have 12 NPIs?

An organization may obtain more than one Type 2 NPI, for example for separate locations or units that bill on their own. Oa Associates's NPIs list practice locations in 6 cities.

Is an organization NPI a license?

No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.

Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.