MARGARET LEFTWICH MILLER MD
NPI 1093768160
Psychiatry & Neurology - Forensic Psychiatry in Napa, CA
About Margaret Leftwich Miller Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET LEFTWICH MILLER MD (NPI 1093768160) is an individual forensic psychiatry provider in Napa, California, licensed in California (A49932) and active in the NPI registry since May 2006. She is enrolled in Medicare PECOS.
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 (PECOS)
Margaret Leftwich Miller Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Margaret Miller reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Martinez, CA 94553
- Reassigned Medicare billing, California enrollment
- 530 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 2
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.
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.
NAPA, CA 94558
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 Margaret Miller's NPI number?
The NPI number for Margaret Miller is 1093768160. It was assigned to this individual provider in the NPPES registry on May 18, 2006.
Where is Margaret Miller located?
Margaret Miller practices at 2100 Napa Vallejo Highway, Napa, CA 94558. The listed phone number is (707) 253-5000.
What is Margaret Miller's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Forensic Psychiatry, with taxonomy code 2084F0202X.
Is Margaret Miller enrolled in Medicare?
Yes. Margaret Miller is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Margaret Miller's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Miller reassigns Medicare benefits to Contra Costa County (Martinez, CA). The 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 Margaret Miller'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 Margaret Miller 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.
# Margaret Leftwich Miller, MD · NPI 1093768160
Forensic Psychiatry physician in Napa, California. Individual provider, active in the CMS NPPES registry since May 18, 2006.
## Identity
- **NPI:** 1093768160 (Entity type: Individual)
- **Enumerated:** May 18, 2006
- **Primary specialty:** Psychiatry & Neurology - Forensic Psychiatry · taxonomy 2084F0202X
- **State license:** A49932 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2100 NAPA VALLEJO HIGHWAY, Napa, CA 94558-6293
- **Phone:** (707) 253-5000 · **Fax:** (707) 253-5513
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for durable medical equipment, power mobility devices
- **Bills Medicare through:** Contra Costa County (NPI 1386719086, Martinez, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 13, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1093768160) · Data from the CMS NPPES public registry.