SUBJECT:

New Telephone Area Codes

The California Public Utilities Commission recently approved a three-way
geographic split of the 619 telephone area code. The approved boundaries
will divide the 619 region into three sections (northern, central and
eastern) and will result in the creation of two new area codes. The
details are as follows:

- Central section (619) - This area will retain the 619 area code. Some
of the communities in this area include the downtown portion of the city
of San Diego and small portions of Lemon Grove and National City. The
UCSD Medical Center is located in this portion.

- Northern section (858) - This area will receive the new 858 area code.
It will begin service on June 12, 1999. Some of the communities in this
area include Rancho Santa Fe, Solana Beach, Del Mar, La Jolla, Poway and
the northern portion of the city of San Diego. The UCSD main campus and
the Thornton Hospital are located in this portion.

- Eastern section (935) - This area will receive the new 935 area code.
It will begin service on June 10, 2000. Some of communities in this area
include Coronado, La Mesa, Chula Vista, Lakeside, El Cajon, Alpine, Pine
Valley, Campo, Jacumba, Imperial Beach, Santee, the majority of both Lemon
Grove and National City and the southern portion of the city of San Diego.

The main impact to us from these changes is that the area code of all main
campus and Thornton hospital phones will change from 619 to 858 in about a
year. These changes will not affect the price of calls or the ability to
use the 5-digit dialing between Campus and Medical Center locations.

We are informing you of these changes well in advance to provide ample
time for changes that you may need to make (e.g., printing business
cards, stationery, brochures, etc.)

If you have any questions please contact the ACT Help Desk at x41853.

Thank you.

Elazar C. Harel Assistant Vice Chancellor