DR. PETER JAMES MAZOLEWSKI M.D.
NPI 1710076773
Surgery in Walnut Creek, CA
About Dr. Peter James Mazolewski M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. PETER JAMES MAZOLEWSKI M.D. (NPI 1710076773) is an individual surgery provider in Walnut Creek, California, licensed in California (A84094) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Southern California Keck School Of Medicine (1994).
NPPES Registry Identity
Specialties & Licenses 2
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. Peter James Mazolewski 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 Peter Mazolewski 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 94598
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Bass Medical Group
- 347 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 5
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 94598 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 2
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 Peter Mazolewski's NPI number?
The NPI number for Peter Mazolewski is 1710076773. It was assigned to this individual provider in the NPPES registry on October 11, 2006.
Where is Peter Mazolewski located?
Peter Mazolewski practices at 365 Lennon Ln Ste 290, Walnut Creek, CA 94598. The listed phone number is (925) 658-5076.
What is Peter Mazolewski's specialty?
The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.
Is Peter Mazolewski enrolled in Medicare?
Yes. Peter Mazolewski 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 Peter Mazolewski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Peter Mazolewski reassigns Medicare benefits to 2 organizations: Bay Area Surgical Specialists Inc A Medical Corporation (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 Peter Mazolewski'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 Peter Mazolewski was last updated on February 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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. Peter James Mazolewski, M.D. · NPI 1710076773
Surgery physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since October 11, 2006.
## Identity
- **NPI:** 1710076773 (Entity type: Individual)
- **Enumerated:** October 11, 2006
- **Primary specialty:** Surgery · taxonomy 208600000X
- **State license:** A84094 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 365 LENNON LN STE 290, Walnut Creek, CA 94598-5915
- **Phone:** (925) 658-5076 · **Fax:** (925) 658-5089
## 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): Bay Area Surgical Specialists Inc A Medical Corporation (NPI 1023501905, Walnut Creek, CA); John Muir Trauma Physicians Billing Service (NPI 1962551861, Walnut Creek, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Southern California Keck School Of Medicine, class of 1994
## Record status
- **NPPES last updated:** February 26, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1710076773) · Data from the CMS NPPES public registry.