William Lambert, MD
NPI 1285669507 · Psychiatry Physician · Greenwood, SC
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Lambert, MD is a Psychiatry Physician provider in Greenwood, SC (NPI 1285669507).
Provider details
- NPI number
- 1285669507
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 36533 (SC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
182 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 92 | $118 |
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 90 | $58 |
Typical Medicare-allowed amounts for these services range $58–$118 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clonazepam | 114 | 16 |
| Lorazepam | 74 | 13 |
| Trazodone Hcl | 67 | 16 |
| Alprazolam | 66 | — |
| Duloxetine Hcl | 52 | 11 |
| Escitalopram Oxalate | 42 | — |
| Quetiapine Fumarate | 31 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-12
- Last updated
- 2021-12-10
- Certified
- 2021-12-10
Frequently asked questions
- What is William Lambert's NPI number?
- William Lambert's National Provider Identifier (NPI) is 1285669507, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Lambert's specialty?
- William Lambert is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is William Lambert located?
- William Lambert's practice location on file with NPPES is 1325 Spring St, Greenwood, SC 29646-3860.
- What is William Lambert's phone number?
- The practice phone number listed in the NPPES registry for William Lambert is (864) 725-4398.
- Does William Lambert accept Medicare?
- William Lambert is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Lambert's NPI active?
- Yes — William Lambert's NPI (1285669507) is active in the NPPES registry as of the last update on 2021-12-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.