DR. PETER W ACKERMAN MD
NPI 1427435023
Emergency Medicine in Walnut Creek, CA
About Dr. Peter W Ackerman Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. PETER W ACKERMAN MD (NPI 1427435023) is an individual emergency medicine provider in Walnut Creek, California, licensed in New York (292833) and active in the NPI registry since May 2015. He is enrolled in Medicare PECOS, is affiliated with White Plains Hospital Center, and is a graduate of Other (2015).
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. Peter W Ackerman 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 Peter Ackerman reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Richmond, CA 94801
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
White Plains, NY 10601
- Reassigned Medicare billing, New York enrollment
- 479 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 6
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
White Plains Hospital Center
Acute Care Hospitals · White Plains, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94596 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WALNUT CREEK, CA 94596
WALNUT CREEK, CA 94596
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 Ackerman's NPI number?
The NPI number for Peter Ackerman is 1427435023. It was assigned to this individual provider in the NPPES registry on May 4, 2015.
Where is Peter Ackerman located?
Peter Ackerman practices at 1425 S Main St, Walnut Creek, CA 94596. The listed phone number is (925) 295-4000.
What is Peter Ackerman's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Peter Ackerman enrolled in Medicare?
Yes. Peter Ackerman 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 Ackerman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Peter Ackerman reassigns Medicare benefits to 2 organizations: Permanente Medical Group Inc (Richmond, CA) and East Post Road Medical Services PC (White Plains, NY). 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 Ackerman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Peter Ackerman affiliated with any hospitals?
According to CMS data, Peter Ackerman is affiliated with White Plains Hospital Center.
When was this NPI record last updated?
The NPPES record for Peter Ackerman was last updated on February 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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 W Ackerman, MD · NPI 1427435023
Emergency Medicine physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since May 4, 2015.
## Identity
- **NPI:** 1427435023 (Entity type: Individual)
- **Enumerated:** May 4, 2015
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 292833 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1425 S MAIN ST, Walnut Creek, CA 94596-5318
- **Phone:** (925) 295-4000
## 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): Permanente Medical Group Inc (NPI 1235226531, Richmond, CA); East Post Road Medical Services PC (NPI 1841767274, White Plains, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** February 24, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1427435023) · Data from the CMS NPPES public registry.