The article reviews the effectiveness of telemental health, particularly telespsychiatry and psychological services, from 2003 to 2013. The authors conducted a comprehensive literature review to assess the effectiveness of telemental health in various populations, settings, and disorders. Key findings include: 1. **Effectiveness**: Telemental health is effective for diagnosis and assessment across diverse populations (adults, children, geriatrics, and ethnic groups) and in various settings (emergency, home health). It is comparable to in-person care and complements primary care services. 2. **New Models**: Collaborative care, asynchronous, and mobile models have shown positive outcomes, indicating the potential for innovative service delivery. 3. **Comparison with In-Person Care**: Studies have shown that telemental health can be as effective as in-person care in terms of feasibility, outcomes, age, and patient satisfaction. 4. **Specific Populations**: Telemental health has been found to be feasible and acceptable for children, adolescents, and geriatric patients. It has also shown promise in serving diverse cultural and linguistic communities. 5. **Cost and Access**: Telemental health has increased access to care, reducing travel, time, and financial barriers. Cost analyses suggest that telemental health can be cost-effective, especially in rural areas. 6. **Future Directions**: The authors recommend further research on service models, specific disorders, cultural and language issues, and cost-effectiveness. They also emphasize the need for more rigorous evaluation methods, such as randomized trials, to enhance the evidence base for telemental health. The article concludes that telemental health is effective and has the potential to improve access to mental health services, but more research is needed to fully understand its impact and optimize its delivery.The article reviews the effectiveness of telemental health, particularly telespsychiatry and psychological services, from 2003 to 2013. The authors conducted a comprehensive literature review to assess the effectiveness of telemental health in various populations, settings, and disorders. Key findings include: 1. **Effectiveness**: Telemental health is effective for diagnosis and assessment across diverse populations (adults, children, geriatrics, and ethnic groups) and in various settings (emergency, home health). It is comparable to in-person care and complements primary care services. 2. **New Models**: Collaborative care, asynchronous, and mobile models have shown positive outcomes, indicating the potential for innovative service delivery. 3. **Comparison with In-Person Care**: Studies have shown that telemental health can be as effective as in-person care in terms of feasibility, outcomes, age, and patient satisfaction. 4. **Specific Populations**: Telemental health has been found to be feasible and acceptable for children, adolescents, and geriatric patients. It has also shown promise in serving diverse cultural and linguistic communities. 5. **Cost and Access**: Telemental health has increased access to care, reducing travel, time, and financial barriers. Cost analyses suggest that telemental health can be cost-effective, especially in rural areas. 6. **Future Directions**: The authors recommend further research on service models, specific disorders, cultural and language issues, and cost-effectiveness. They also emphasize the need for more rigorous evaluation methods, such as randomized trials, to enhance the evidence base for telemental health. The article concludes that telemental health is effective and has the potential to improve access to mental health services, but more research is needed to fully understand its impact and optimize its delivery.