Thomas Baier, MD
Thomas Baier, MD is an Adult Reconstructive Orthopaedic Surgery Physician in Libertyville, IL, registered under NPI 1699765842.
Getting there
The practice address on file is 825 MILWAUKEE AVE, Libertyville, IL 60048. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 036.063419 | IL | Adult Reconstructive Orthopaedic Surgery… primary |
This provider holds licence 036.063419 issued in IL. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
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 Adult Reconstructive Orthopaedic Surgery covers
Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, adult reconstructive orthopaedic surgeons deal with reconstructive procedures such as joint arthroplasty (i.e., hip and knee), osteotomy, arthroscopy, soft-tissue reconstruction, and a variety of other adult reconstructive surgical procedures. NUCC Health Care Provider Taxonomy, code 207XS0114X
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-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1699765842 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 27, 2005 |
| Last updated | Feb 2, 2021 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
825 MILWAUKEE AVE Libertyville, IL 60048 (847) 634-1766 Fax (847) 634-2894 |
| Mailing address |
105 N GREENLEAF ST Gurnee, IL 60031 |
| Other identifiers |
036063419
(IL) 04915144 · BLUE CROSS BLUE SHIELD OF (IL) |
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 | 6 | 9 | 9 | 7 | 6 | 5 | 8 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 9 | 9 | 5 | 6 | 1 | 8 | 8 |
Sum = 78 · next multiple of 10 = 80 · 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.