Exhibit 99.1350CERT

         Certification Pursuant to Section 906 of the Sarbanes Oxley Act

      I, Terry K. Glenn, President of MuniYield California Insured Fund, Inc.
      (the "Fund"), certify that:

            1.    The N-CSR of the Fund (the "Report") fully complies with the
                  requirements of Section 13(a) or 15(d) of the Securities
                  Exchange Act of 1934; and

            2.    The information contained in the Report fairly presents, in
                  all material respects, the financial condition and results of
                  operations of the Fund.

      Dated: December 22, 2003


                                         /s/ Terry K. Glenn
                                         ------------------
                                         Terry K. Glenn,
                                         President of
                                         MuniYield California Insured Fund, Inc.

      A signed original of this written statement required by Section 906, or
      other document authenticating, acknowledging, or otherwise adopting the
      signature that appears in typed form within the electronic version of this
      written statement required by Section 906, has been provided to MuniYield
      California Insured Fund, Inc. and will be retained by MuniYield California
      Insured Fund, Inc. and furnished to the Securities and Exchange Commission
      or its staff upon request.



Exhibit 99.1350CERT

         Certification Pursuant to Section 906 of the Sarbanes Oxley Act

      I, Donald C. Burke, Chief Financial Officer of MuniYield California
      Insured Fund, Inc. (the "Fund"), certify that:

            1.    The N-CSR of the Fund (the "Report") fully complies with the
                  requirements of Section 13(a) or 15(d) of the Securities
                  Exchange Act of 1934; and

            2.    The information contained in the Report fairly presents, in
                  all material respects, the financial condition and results of
                  operations of the Fund.

      Dated: December 22, 2003


                                         /s/ Donald C. Burke
                                         -------------------
                                         Donald C. Burke,
                                         Chief Financial Officer of
                                         MuniYield California Insured Fund, Inc.

      A signed original of this written statement required by Section 906, or
      other document authenticating, acknowledging, or otherwise adopting the
      signature that appears in typed form within the electronic version of this
      written statement required by Section 906, has been provided to MuniYield
      California Insured Fund, Inc. and will be retained by MuniYield California
      Insured Fund, Inc. and furnished to the Securities and Exchange Commission
      or its staff upon request.