William Mcmiller, M.D.
William Mcmiller, M.D. is a Child & Adolescent Psychiatry Physician in Oak Park, IL, registered under NPI 1851518617. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 18 LAKE ST, Oak Park, IL 60302. 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 |
|---|---|---|
| 036078553 | IL | Child & Adolescent Psychiatry Physician primary |
| 036-078553 | IL | Pediatrics Physician |
| 036078553 | IL | Psychiatry Physician |
This provider holds licence 036078553 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 Child & Adolescent Psychiatry covers
Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence. NUCC Health Care Provider Taxonomy, code 2084P0804X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2084P0804X | Child & Adolescent Psychiatry Physician Child & Adolescent Psychiatry | 036078553 | IL | primary |
| 208000000X | Pediatrics Physician | 036-078553 | IL | |
| 2084P0800X | Psychiatry Physician Psychiatry | 036078553 | IL |
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 | 1851518617 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 20, 2007 |
| Last updated | Mar 11, 2021 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | M.D. |
| Practice address |
18 LAKE ST Oak Park, IL 60302 (708) 434-0336 Fax (708) 386-1391 |
| Mailing address |
PO BOX 3991 Oak Park, IL 60303 |
| Other identifiers |
036078553
· Medicaid (IL) 1487103453 · Other |
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 | 8 | 5 | 1 | 5 | 1 | 8 | 6 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 1 | 1 | 1 | 1 | 7 | 6 | 2 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
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.