DR. NATALIA ZIELKIEWICZ M.D.
NPI 1033272729
Internal Medicine - Hospice and Palliative Medicine in Walnut Creek, CA
About Dr. Natalia Zielkiewicz M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NATALIA ZIELKIEWICZ M.D. (NPI 1033272729) is an individual hospice and palliative medicine provider in Walnut Creek, California, licensed in California (A96545) and active in the NPI registry since December 2006. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2004).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 3
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. Natalia Zielkiewicz M.d. 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 Natalia Zielkiewicz reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94597
- Reassigned Medicare billing, California enrollment
- 650 clinicians in this Medicare group
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 810 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 4
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.
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.
WALNUT CREEK, CA 94597
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 Natalia Zielkiewicz's NPI number?
The NPI number for Natalia Zielkiewicz is 1033272729. It was assigned to this individual provider in the NPPES registry on December 18, 2006.
Where is Natalia Zielkiewicz located?
Natalia Zielkiewicz practices at 1450 Treat Blvd # 120, Walnut Creek, CA 94597. The listed phone number is (925) 296-9720.
What is Natalia Zielkiewicz's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hospice and Palliative Medicine, with taxonomy code 207RH0002X.
Is Natalia Zielkiewicz enrolled in Medicare?
Yes. Natalia Zielkiewicz 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 Natalia Zielkiewicz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Natalia Zielkiewicz reassigns Medicare benefits to 2 organizations: John Muir Physician Network (Walnut Creek, CA) and John Muir Trauma Physicians Billing Service (Walnut Creek, 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 Natalia Zielkiewicz'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 Natalia Zielkiewicz was last updated on March 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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. Natalia Zielkiewicz, M.D. · NPI 1033272729
Hospice and Palliative Medicine physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since December 18, 2006.
## Identity
- **NPI:** 1033272729 (Entity type: Individual)
- **Enumerated:** December 18, 2006
- **Primary specialty:** Internal Medicine - Hospice and Palliative Medicine · taxonomy 207RH0002X
- **State license:** A96545 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1450 TREAT BLVD # 120, Walnut Creek, CA 94597-2168
- **Phone:** (925) 296-9720
## 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): John Muir Physician Network (NPI 1841407665, Walnut Creek, CA); John Muir Trauma Physicians Billing Service (NPI 1962551861, Walnut Creek, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2004
## Record status
- **NPPES last updated:** March 7, 2023
- **Other identifiers:** Other 00A965451 (CA); Other P00938337 (CA); Medicaid 1033272729 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1033272729) · Data from the CMS NPPES public registry.