Cynthia Williams, LCSW
NPI 1528672383 · Professional Counselor · O Fallon, MO
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cynthia Williams, LCSW is a Professional Counselor provider in O Fallon, MO (NPI 1528672383).
Provider details
- NPI number
- 1528672383
- Entity type
- Individual
- Primary specialty
- Professional CounselorBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- No
- License
- 2016042364 (MO)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
5 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
401 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Psychotherapy, 1 Hour90837 | 372 | $111 |
| Psychiatric Diagnostic Evaluation90791 | 15 | $126 |
| Psychotherapy, 45 Minutes90834 | 14 | $75 |
Typical Medicare-allowed amounts for these services range $75–$126 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-08-31
- Last updated
- 2020-08-31
- Certified
- 2020-08-28
Frequently asked questions
- What is Cynthia Williams's NPI number?
- Cynthia Williams's National Provider Identifier (NPI) is 1528672383, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cynthia Williams's specialty?
- Cynthia Williams is listed in the NPPES registry with a primary specialty of Professional Counselor (Behavioral Health & Social Service Providers).
- Where is Cynthia Williams located?
- Cynthia Williams's practice location on file with NPPES is 801 Woodlawn Ave Ste 15, O Fallon, MO 63366-7647.
- What is Cynthia Williams's phone number?
- The practice phone number listed in the NPPES registry for Cynthia Williams is (636) 379-1779.
- Does Cynthia Williams accept Medicare?
- Cynthia Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cynthia Williams's NPI active?
- Yes — Cynthia Williams's NPI (1528672383) is active in the NPPES registry as of the last update on 2020-08-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.