DR. LAWRENCE POSNER MD
NPI 1952390098
Internal Medicine in Sausalito, CA
About Dr. Lawrence Posner Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LAWRENCE POSNER MD (NPI 1952390098) is an individual internal medicine provider in Sausalito, California, licensed in California (A20698) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Lawrence Posner Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Lawrence Posner reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Novato, CA 94949
- Reassigned Medicare billing, California enrollment
- 111 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94965 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 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 Lawrence Posner's NPI number?
The NPI number for Lawrence Posner is 1952390098. It was assigned to this individual provider in the NPPES registry on October 20, 2005.
Where is Lawrence Posner located?
Lawrence Posner practices at 3 Harbor Drive Suite 111, Sausalito, CA 94965. The listed phone number is (415) 683-2988.
What is Lawrence Posner's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Lawrence Posner enrolled in Medicare?
Yes. Lawrence Posner is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Lawrence Posner's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Lawrence Posner reassigns Medicare benefits to Prima Medical Foundation (Novato, 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 Lawrence Posner'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 Lawrence Posner was last updated on February 1, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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. Lawrence Posner, MD · NPI 1952390098
Internal Medicine physician in Sausalito, California. Individual provider, active in the CMS NPPES registry since October 20, 2005.
## Identity
- **NPI:** 1952390098 (Entity type: Individual)
- **Enumerated:** October 20, 2005
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A20698 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 3 HARBOR DRIVE, SUITE 111, Sausalito, CA 94965
- **Phone:** (415) 683-2988 · **Fax:** (415) 683-2980
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Prima Medical Foundation (NPI 1811217946, Novato, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 1, 2011
- **Other identifiers:** Medicare UPIN A22281 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1952390098) · Data from the CMS NPPES public registry.