Quick answers
- Does Anne T. Riordan accept Medicare assignment?
- Yes. Medicare's clinician data says Anne T. Riordan 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 Anne T. Riordan see?
- In 2024, CMS data shows 403 Original Medicare patients and 2,346 services for Anne T. Riordan. This counts Original Medicare only and measures volume, not quality.
- What is Anne T. Riordan's NPI number?
- 1609985290. 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 Anne T. Riordan, 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 | 403 |
|---|---|
| Services billed to Medicare | 2,346 |
| Different services or procedures | 21 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Destruction of precancer skin growth, 2-14 growths (17003)1,084 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)381 services
- Destruction of precancer skin growth, 1 growth (17000)274 services
- Destruction of skin growth, 1-14 growths (17110)188 services
- Biopsy of related skin growth, first growth (11102)138 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 cholesterol75%
- High blood pressure65%
- Arthritis47%
- Diabetes23%
- Ischemic heart disease21%
- Anxiety21%
Practice locations
Addresses where Anne T. Riordan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1001 Chesterfield Pkwy E, Suite 101Chesterfield, MO 63017 (317) 878‑3839
- 621 S New Ballas Rd, Suite 498aSaint Louis, MO 63141 (314) 251‑3376
Group practices
Medicare enrollment lists Anne T. Riordan as a member of this group (CMS data updated October 2, 2026).
- United Skin Specialists Missouri Ltd PC14 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in Chesterfield
Clinicians with the same Medicare primary specialty in Chesterfield, MO — not a recommendation.
Other clinicians in United Skin Specialists Missouri Ltd PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Rutgers R W Johnson Medical School (cam/new Bruns/pisc) |
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609985290 |
| 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 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