Mail Stop 3030
                                                                 July 30, 2018

     Via E-mail
     Dean Irwin
     Chief Executive Officer
     Ra Medical Systems, Inc.
     2070 Las Palmas Drive
     Carlsbad, CA 92011

            Re:     Ra Medical Systems, Inc.
                    Registration Statement on Form S-1
                    Filed July 16, 2018
                    File No. 333-226191

     Dear Mr. Irwin:

            We have reviewed your registration statement and have the following
comments. In
     some of our comments, we may ask you to provide us with information so we
may better
     understand your disclosure.

            Please respond to this letter by amending your registration
statement and providing the
     requested information. If you do not believe our comments apply to your
facts and
     circumstances or do not believe an amendment is appropriate, please tell
us why in your
     response.

            After reviewing any amendment to your registration statement and
the information you
     provide in response to these comments, we may have additional comments.

     Our products may be subject to recalls . . ., page 32

     1.     We note your added disclosure regarding the Form 483 letter you
received from the FDA.
            Please expand your disclosure here and on page 108 to provide more
detail regarding the
            FDA's observations, including as examples only, the product to
which the observations
            relate, the nature of complaints you received subject to the
observations, and the process,
            including your anticipated timeframe, for resolving the
investigative observations.
 Dean Irwin
Ra Medical Systems, Inc.
July 30, 2018
Page 2

If any of our products cause or contribute . . ., page 33

2.     Please tell us why you removed the disclosure regarding medical device
reporting events.
       Include in your response whether you have since reported medical device
reporting
       events or identified events in which you should have reported.

        We remind you that the company and its management are responsible for
the accuracy
and adequacy of their disclosures, notwithstanding any review, comments, action
or absence of
action by the staff.

       Refer to Rules 460 and 461 regarding requests for acceleration. Please
allow adequate
time for us to review any amendment prior to the requested effective date of
the registration
statement.

        You may contact Eric Atallah at (202) 551-3663 or Kevin Kuhar,
Accounting Branch
Chief, at (202) 551-3662 if you have questions regarding comments on the
financial statements
and related matters. Please contact Caleb French at (202) 551-6947 or Heather
Percival, Senior
Attorney, at (202) 551-3498 with any other questions.

                                                            Sincerely,

                                                            /s/ Heather
Percival for

                                                            Amanda Ravitz
                                                            Assistant Director
                                                            Office of
Electronics and Machinery

cc:    Martin J. Waters, Esq.
       Wilson Sonsini Goodrich & Rosati, P.C.