Quick answers
- Does Ada M. Winkielman accept Medicare assignment?
- Yes. Medicare's clinician data says Ada M. Winkielman 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 Ada M. Winkielman see?
- In 2024, CMS data shows 359 Original Medicare patients and 2,040 services for Ada M. Winkielman. This counts Original Medicare only and measures volume, not quality.
- What is Ada M. Winkielman's NPI number?
- 1992798870. 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 Ada M. Winkielman, 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 | 359 |
|---|---|
| Services billed to Medicare | 2,040 |
| Different services or procedures | 65 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Destruction of precancer skin growth, 2-14 growths (17003)462 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)418 services
- Pathology examination of tissue using a microscope, intermediate complexity (88305)248 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)163 services
- Destruction of skin growth, 1-14 growths (17110)154 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 pressure74%
- Arthritis55%
- Ischemic heart disease31%
- Diabetes22%
- Osteoporosis22%
Practice locations
Addresses where Ada M. Winkielman is enrolled with Medicare (CMS data updated October 2, 2026).
- 18364 Clark StTarzana, CA 91356 (818) 345‑7122
- 2925 Sycamore DrSimi Valley, CA 93065 (805) 527‑6586
Group practices
Medicare enrollment lists Ada M. Winkielman as a member of these groups (CMS data updated October 2, 2026).
- Valley Dermatologic Medical Group Inc3 clinicians in the group
- Simi Dermatologic Medical Center, Inc2 clinicians in the group
Specialties
- Dermatologyprimary
- Pathologyalso
Other dermatologists in Tarzana
Clinicians with the same Medicare primary specialty in Tarzana, CA — not a recommendation.
Other clinicians in Valley Dermatologic Medical Group Inc
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) | 1992798870 |
| 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