Quick answers
- Does Kassandra K. McMillen accept Medicare assignment?
- Yes. Medicare's clinician data says Kassandra K. McMillen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Kassandra K. McMillen's NPI number?
- 1659746477. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Kassandra K. McMillen works
Medicare's Facility Affiliation Data lists Kassandra K. McMillen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- AdventHealth Castle RockCastle Rock, CO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 060125
Practice locations
Addresses where Kassandra K. McMillen is enrolled with Medicare (CMS data updated October 2, 2026).
- 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
- 2535 S Downing StDenver, CO 80210 (303) 778‑5797
Group practices
Medicare enrollment lists Kassandra K. McMillen as a member of this group (CMS data updated October 2, 2026).
- Portercare Adventist Health System774 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Castle Rock
Clinicians with the same Medicare primary specialty in Castle Rock, CO — not a recommendation.
Other clinicians in Portercare Adventist Health System
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Arkansas College Of Medicine |
| Graduation year | 2014 (12 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659746477 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- 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