Quick answers
- Does Fiona Zwald accept Medicare assignment?
- Yes. Medicare's clinician data says Fiona Zwald 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.
- How many Medicare patients does Fiona Zwald see?
- In 2024, CMS data shows 414 Original Medicare patients and 1,011 services for Fiona Zwald. This counts Original Medicare only and measures volume, not quality.
- What is Fiona Zwald's NPI number?
- 1487768883. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Fiona Zwald, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 414 |
|---|---|
| Services billed to Medicare | 1,011 |
| Different services or procedures | 76 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)186 services
- Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks (17311)137 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)74 services
- Destruction of precancer skin growth, 2-14 growths (17003)66 services
- Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks (17312)66 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure71%
- High cholesterol71%
- Arthritis46%
- Chronic kidney disease36%
- Ischemic heart disease33%
- Diabetes26%
Hospitals where Fiona Zwald works
Medicare's Facility Affiliation Data lists Fiona Zwald 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.
- University of Colorado Hospital AuthorityAurora, CO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 060024
Practice locations
Addresses where Fiona Zwald is enrolled with Medicare (CMS data updated October 2, 2026).
- 501 S Cherry St, Suite 310Glendale, CO 80246 (303) 333‑7873
Group practices
Medicare enrollment lists Fiona Zwald as a member of this group (CMS data updated October 2, 2026).
- Samantha Ghiselli MD PLLC4 clinicians in the group
Specialties
Other dermatologists in Glendale
Clinicians with the same Medicare primary specialty in Glendale, CO — not a recommendation.
Other clinicians in Samantha Ghiselli MD PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1990 (36 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1487768883 |
| 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
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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