John Williams, MD
NPI 1972943470 · Psychiatry Physician · Lafayette, CO
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Williams, MD is a Psychiatry Physician provider in Lafayette, CO (NPI 1972943470).
Provider details
- NPI number
- 1972943470
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- DR.0066807 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
12 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Quetiapine Fumarate | 25 |
| Lorazepam | 21 |
| Fluoxetine Hcl | 18 |
| Olanzapine | 18 |
| Clonazepam | 16 |
| Bupropion Hclbrand: Bupropion Xl | 15 |
| Lithium Carbonate | 13 |
| Lamotriginebrand: Lamotrigine Er | 13 |
| Trazodone Hcl | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-06-28
- Last updated
- 2021-09-10
- Certified
- 2021-09-10
Frequently asked questions
- What is John Williams's NPI number?
- John Williams's National Provider Identifier (NPI) is 1972943470, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Williams's specialty?
- John Williams is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is John Williams located?
- John Williams's practice location on file with NPPES is 1455 Dixon Ave Ste 300, Lafayette, CO 80026-8880.
- What is John Williams's phone number?
- The practice phone number listed in the NPPES registry for John Williams is (303) 443-8500.
- Does John Williams accept Medicare?
- John Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Williams's NPI active?
- Yes — John Williams's NPI (1972943470) is active in the NPPES registry as of the last update on 2021-09-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.