Domestic Partners - Medical Coverage Issues --- The California Insurance Equality Act (AB 22081/2005) §10121.7. (a) 381.5  requires insurance Companies  to  treat Registered domestic partners and married spouses the same.

Some Insurance Companies  allow Heterosexuals, to be covered, if the Employer wants to provide for that option.  See question 7 g on the sample Employer Group Health Insurance Application - it may also be a law... Here's a sample  certification form for domestic partnership arrangements.

Consumer Links

Blue Shield FAQ's

Q & A Equality CA Website, 

Summary PJ Hoskins, Esq.

Law Excerpts

Insurance Code §10121.7. (a) A policy of group health insurance that provides hospital, medical, or surgical expense benefits shall provide equal coverage to employers or guaranteed associations, as defined in Section10700, (f) or the  domestic partner Registry

Family Law Code 297-297.5(5) Either of the following:
   (A) Both persons are members of the same sex.
   (B) ... persons of opposite sexes may not constitute a domestic partnership unless one or both of the persons are over the age of 62.
 

DEFINITIONS 297-297.5    REGISTRATION 298-298.5      TERMINATION  299-299.3
  LEGAL EFFECT       PREEMPTION  Family Law Code 299.6
 of an employee, insured, or policyholder to the same extent, and subject to the same terms and conditions, as provided to a spouse of the employee, insured, or policyholder, and shall inform employers and guaranteed associations of this coverage

Insurance Code 381.5. (a) Every policy ...shall provide coverage for the  Domestic Partner Registry of an insured or policyholder that is equal to, and subject to the same terms and conditions as, the coverage provided to a spouse of an insured or policyholder. ...This subdivision applies to all forms of insurance regulated by this code.