DR. ANDREW G MAYER MD
NPI 1215949201
Internal Medicine - Gastroenterology in La Jolla, CA
About Dr. Andrew G Mayer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ANDREW G MAYER MD (NPI 1215949201) is an individual gastroenterology provider in La Jolla, California, licensed in California (A77759) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of State University Of New York At Buffalo School Of Medicine (2000).
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. Andrew G Mayer 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 Andrew Mayer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
La Jolla, CA 92037
- Reassigned Medicare billing, California enrollment
- 1,598 clinicians in this Medicare group
La Jolla, CA 92037
- Reassigned Medicare billing, California enrollment
- 5 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 11
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 92037 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LA JOLLA, CA 92037
LA JOLLA, CA 92037
LA JOLLA, CA 92037
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 Andrew Mayer's NPI number?
The NPI number for Andrew Mayer is 1215949201. It was assigned to this individual provider in the NPPES registry on August 12, 2006.
Where is Andrew Mayer located?
Andrew Mayer practices at 9850 Genesee Ave #820, La Jolla, CA 92037. The listed phone number is (858) 453-5200.
What is Andrew Mayer's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Andrew Mayer enrolled in Medicare?
Yes. Andrew Mayer 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 Andrew Mayer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Andrew Mayer reassigns Medicare benefits to 2 organizations: Scripps Health (La Jolla, CA) and La Jolla Gastroenterology Medical Group, Inc (La Jolla, 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 Andrew Mayer'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 Andrew Mayer was last updated on July 31, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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. Andrew G Mayer, MD · NPI 1215949201
Gastroenterology physician in La Jolla, California. Individual provider, active in the CMS NPPES registry since August 12, 2006.
## Identity
- **NPI:** 1215949201 (Entity type: Individual)
- **Enumerated:** August 12, 2006
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** A77759 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 9850 GENESEE AVE, #820, La Jolla, CA 92037-1224
- **Phone:** (858) 453-5200 · **Fax:** (858) 453-4589
## 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): Scripps Health (NPI 1841277704, La Jolla, CA); La Jolla Gastroenterology Medical Group, Inc (NPI 1457397465, La Jolla, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York At Buffalo School Of Medicine, class of 2000
## Record status
- **NPPES last updated:** July 31, 2007
---
Source: [NPI Profile](https://npiprofile.com/npi/1215949201) · Data from the CMS NPPES public registry.