Mary Beth Williams, PH.D., LCSW, CTS
NPI 1942399811 · Clinical Social Worker · Warrenton, VA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Beth Williams, PH.D., LCSW, CTS is a Clinical Social Worker provider in Warrenton, VA (NPI 1942399811).
Provider details
- NPI number
- 1942399811
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- PH.D., LCSW, CTS
- Sex
- Female
- Sole proprietor
- Yes
- License
- 0904000277 (VA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
19 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
157 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 | 157 | $111 |
Typical Medicare-allowed amounts for these services range $111–$111 (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
- 2006-10-11
- Last updated
- 2025-09-11
Frequently asked questions
- What is Mary Beth Williams's NPI number?
- Mary Beth Williams's National Provider Identifier (NPI) is 1942399811, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Beth Williams's specialty?
- Mary Beth Williams is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mary Beth Williams located?
- Mary Beth Williams's practice location on file with NPPES is 9 N 3rd St, Warrenton, VA 20186-3404.
- What is Mary Beth Williams's phone number?
- The practice phone number listed in the NPPES registry for Mary Beth Williams is (540) 341-7339.
- Does Mary Beth Williams accept Medicare?
- Mary Beth Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Beth Williams's NPI active?
- Yes — Mary Beth Williams's NPI (1942399811) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.