Quick answers
- Where does John Williams Jr. see patients?
- Medicare's clinician data lists 1 practice location in Greenwood Village, CO. Call before your visit to confirm the address.
- What is John Williams Jr.'s specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does John Williams Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says John Williams Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for John Williams Jr.?
- (303) 438-3999, as listed in official Medicare / NPI Registry data.
- What is John Williams Jr.'s NPI number?
- 1194752915. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where John Williams Jr. is enrolled with Medicare (CMS data updated 2026-10-02).
- 8000 E Maplewood Ave, Suite 200Greenwood Village, CO 80111 (303) 438‑3999
Group practices
Medicare enrollment lists John Williams Jr. as a member of this group (CMS data updated 2026-10-02).
- US Anesthesia Partners of Colorado Inc461 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Greenwood Village
Clinicians with the same Medicare primary specialty in Greenwood Village, CO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Texas A & M University System, Hsc, College Of Medicine |
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1194752915 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians