DR. ADA M WINKIELMAN MD
NPI 1992798870
Dermatology - Dermatopathology in Tarzana, CA
About Dr. Ada M Winkielman Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ADA M WINKIELMAN MD (NPI 1992798870) is an individual dermatopathology provider in Tarzana, California, licensed in California (A81078) and active in the NPI registry since August 2005. She is enrolled in Medicare PECOS and is a graduate of Other (1990).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Ada M Winkielman Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Ada Winkielman reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tarzana, CA 91356
- Reassigned Medicare billing, California enrollment
- 4 clinicians in this Medicare group
Simi Valley, CA 93065
- Reassigned Medicare billing, California enrollment
- 3 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 13
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91356 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Ada Winkielman's NPI number?
The NPI number for Ada Winkielman is 1992798870. It was assigned to this individual provider in the NPPES registry on August 25, 2005.
Where is Ada Winkielman located?
Ada Winkielman practices at 18364 Clark St, Tarzana, CA 91356. The listed phone number is (818) 345-7122.
What is Ada Winkielman's specialty?
The primary specialty registered for this NPI is Dermatology, specializing in Dermatopathology, with taxonomy code 207ND0900X.
Is Ada Winkielman enrolled in Medicare?
Yes. Ada Winkielman is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Ada Winkielman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ada Winkielman reassigns Medicare benefits to 2 organizations: Valley Dermatologic Medical Group, Inc (Tarzana, CA) and Simi Dermatologic Medical Center, Inc (Simi Valley, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ada Winkielman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Ada Winkielman was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Ada M Winkielman, MD · NPI 1992798870
Dermatopathology physician in Tarzana, California. Individual provider, active in the CMS NPPES registry since August 25, 2005.
## Identity
- **NPI:** 1992798870 (Entity type: Individual)
- **Enumerated:** August 25, 2005
- **Primary specialty:** Dermatology - Dermatopathology · taxonomy 207ND0900X
- **State license:** A81078 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 18364 CLARK ST, Tarzana, CA 91356-3502
- **Phone:** (818) 345-7122 · **Fax:** (818) 345-7448
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Valley Dermatologic Medical Group, Inc (NPI 1699770719, Tarzana, CA); Simi Dermatologic Medical Center, Inc (NPI 1144225269, Simi Valley, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1990
## Record status
- **NPPES last updated:** July 13, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1992798870) · Data from the CMS NPPES public registry.