Quick answers
- Which hospitals does Ryan R. McWilliams work at?
- Medicare's official clinician data lists Ryan R. McWilliams at 3 hospitals: AdventHealth Castle Rock, AdventHealth Littleton and AdventHealth Parker. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ryan R. McWilliams see patients?
- Medicare's clinician data lists 11 practice locations, including Castle Rock, CO, Denver, CO and Colorado Springs, CO. Call before your visit to confirm the address.
- What is Ryan R. McWilliams's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Ryan R. McWilliams accept Medicare assignment?
- Yes. Medicare's clinician data says Ryan R. McWilliams 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 Ryan R. McWilliams?
- (720) 455-0650, as listed in official Medicare / NPI Registry data.
- What is Ryan R. McWilliams's NPI number?
- 1326214727. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ryan R. McWilliams works
Medicare's Facility Affiliation Data lists Ryan R. McWilliams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- AdventHealth Castle RockCastle Rock, CO · Acute Care Hospital · CCN 060125
- AdventHealth LittletonLittleton, CO · Acute Care Hospital · CCN 060113
- AdventHealth ParkerParker, CO · Acute Care Hospital · CCN 060114
Practice locations
Addresses where Ryan R. McWilliams is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 11; the Medicare profile lists all.
- 2350 Meadows BlvdCastle Rock, CO 80109 (720) 455‑0650
- 2353 Meadows Blvd, Suite 300Castle Rock, CO 80109 (720) 455‑3750
- 2360 Meadows Blvd, Suite 300Castle Rock, CO 80109 (303) 715‑7106
- 2525 S Downing StDenver, CO 80210
- 2535 D S Downing St, Suite 460Denver, CO 80210 (303) 744‑1065
Group practices
Medicare enrollment lists Ryan R. McWilliams as a member of these groups (CMS data updated 2026-10-02).
- Portercare Adventist Health System774 clinicians in the group
- Peak Gastroenterology Associates33 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Castle Rock
Clinicians with the same Medicare primary specialty in Castle Rock, CO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Colorado School Of Medicine, Denver |
| Graduation year | 2008 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1326214727 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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