Which of the following is considered mandatory coverage for all group health care service contracts?

The correct choice highlights that treatment for alcoholism is considered mandatory coverage for all group health care service contracts. This is based on regulations requiring that group health plans offer certain essential health benefits, which include coverage for substance use disorders such as alcoholism. Federal and state laws, particularly those addressing mental health parity and substance use disorder treatment, mandate that group health policies cannot impose more restrictive limitations on such treatments compared to other medical conditions.

In comparison, the coverage for situations like emergency room visits may be treated differently under various health plans and is not uniformly classified as mandatory under all group contracts. Treatment for obesity and routine dental care also generally do not have the same level of mandated coverage across all plans, as these may vary widely depending on the specific policy and state regulations. Thus, while they may be important aspects of care, they do not receive the same universal requirement as the treatment for alcoholism does.