California Code, Welfare and Institutions Code - WIC § 14124.22

(a) In addition to narcotic treatment program services, a narcotic treatment program provider who is also enrolled as a Medi-Cal provider may provide medically necessary medical treatment of concurrent health conditions within the scope of the provider's practice, to Medi-Cal beneficiaries who are not enrolled in managed care plans.  Medi-Cal beneficiaries enrolled in managed care plans shall be referred to those plans for receipt of medically necessary medical treatment of concurrent health conditions.

(b) Diagnosis and treatment of concurrent health conditions of Medi-Cal beneficiaries not enrolled in managed care plans by a narcotic treatment program provider may be provided within the Medi-Cal coverage limits.  When the services are not part of the substance use disorder treatment reimbursed pursuant to Section 14021.51, services shall be reimbursed in accordance with the Medi-Cal program.  Services reimbursable under this section shall include, but are not limited to, all of the following:

(c) A narcotic treatment provider, who is enrolled as a Medi-Cal fee-for-service provider, shall not seek reimbursement from a beneficiary for substance abuse treatment services, if services for treatment of concurrent health conditions are billed to the Medi-Cal fee-for-service program.