OAK LEYDEN DEVELOPMENTAL SERVICES
OAK LEYDEN DEVELOPMENTAL SERVICES is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1033254347, based in Oak Park, IL. The organization lists 5 taxonomy classifications, with Speech-Language Pathologist recorded as primary.
Getting there
The practice address on file is 411 CHICAGO AVE, 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 |
|---|---|---|
| 146003481 | IL | Speech-Language Pathologist primary |
| 070002012 | IL | Physical Therapist |
| 070004000 | IL | Physical Therapist |
| 070011242 | IL | Physical Therapist |
| 070008117 | IL | Physical Therapist |
| 056003098 | IL | Occupational Therapist |
| 056001573 | IL | Occupational Therapist |
| 146008395 | IL | Speech-Language Pathologist |
| 146005747 | IL | Speech-Language Pathologist |
| 146008122 | IL | Speech-Language Pathologist |
| 146008222 | IL | Speech-Language Pathologist |
This provider holds licence 146003481 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 Speech-Language Pathologist covers
The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing. NUCC Health Care Provider Taxonomy, code 235Z00000X
All registered taxonomy codes
This provider registers 13 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 235Z00000X | Speech-Language Pathologist | 146003481 | IL | primary |
| 1041C0700X | Clinical Social Worker Clinical | — | — | |
| 222Q00000X | Developmental Therapist | — | IL | |
| 225100000X | Physical Therapist | 070002012 | IL | |
| 225100000X | Physical Therapist | 070004000 | IL | |
| 225100000X | Physical Therapist | 070011242 | IL | |
| 225100000X | Physical Therapist | 070008117 | IL | |
| 225X00000X | Occupational Therapist | 056003098 | IL | |
| 225X00000X | Occupational Therapist | 056001573 | IL | |
| 235Z00000X | Speech-Language Pathologist | 146008395 | IL | |
| 235Z00000X | Speech-Language Pathologist | 146005747 | IL | |
| 235Z00000X | Speech-Language Pathologist | 146008122 | IL | |
| 235Z00000X | Speech-Language Pathologist | 146008222 | 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-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 | 1033254347 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Feb 21, 2007 |
| Last updated | Jan 27, 2025 |
| Status | Active |
| Practice address |
411 CHICAGO AVE Oak Park, IL 60302 (708) 524-1050 Fax (708) 524-2469 |
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 | 3 | 3 | 2 | 5 | 4 | 3 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 6 | 3 | 4 | 5 | 8 | 3 | 8 |
Sum = 63 · next multiple of 10 = 70 · 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.