Zerek Mayes, MSW, LCSW, EDD
Zerek Mayes, MSW, LCSW, EDD is a provider specialising in Clinical Social Worker in Chicago, IL, registered under NPI 1104104223. This provider registers 7 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 770 N HALSTED ST STE 306, Chicago, IL 60642. 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 |
|---|---|---|
| 149024349 | IL | Clinical Social Worker primary |
| 149024349 | IL | Community/Behavioral Health Agency |
| 149024349 | IL | Mental Health Clinic/Center (Including… |
| 149024349 | IL | Adult Mental Health Clinic/Center |
| 149024349 | IL | Case Management Agency |
| 149024349 | IL | Adolescent and Children Mental Health… |
This provider holds licence 149024349 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 Clinical covers
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances. NUCC Health Care Provider Taxonomy, code 1041C0700X
All registered taxonomy codes
This provider registers 7 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 1041C0700X | Clinical Social Worker Clinical | 149024349 | IL | primary |
| 251S00000X | Community/Behavioral Health Agency | 149024349 | IL | |
| 261QM0801X | Mental Health Clinic/Center (Including Community Mental Health Center) Mental Health (Including Community Mental Health Center) | 149024349 | IL | |
| 261QM0850X | Adult Mental Health Clinic/Center Adult Mental Health | 149024349 | IL | |
| 101Y00000X | Counselor | — | — | |
| 251B00000X | Case Management Agency | 149024349 | IL | |
| 261QM0855X | Adolescent and Children Mental Health Clinic/Center Adolescent and Children Mental Health | 149024349 | 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 | 1104104223 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 22, 2011 |
| Last updated | Apr 15, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | MSW, LCSW, EDD |
| Practice address |
770 N HALSTED ST STE 306 Chicago, IL 60642 (779) 216-5681 |
| Mailing address |
1911 W WILSON ST Batavia, IL 60510 |
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 | 1 | 0 | 4 | 1 | 0 | 4 | 2 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 0 | 4 | 2 | 0 | 8 | 2 | 4 |
Sum = 47 · next multiple of 10 = 50 · check digit = 3 · actual last digit = 3
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.