The doctors who are interested to attend conferences, business meetings, seminars, workshops, cultural events, sport events, etc. which generally requires a short term stay have to apply for a business visa. It requires 2 days to up to 3 weeks of time to issue a visa and the cost of visa would be US$17-US$30.The maximum number of days you can stay is 180 days. The documents required for the visa application are mentioned below

• Fully completed visa application form.
• A valid passport with at least 6-month validity.
• One passport format photo.
• Proof of sufficient funds (US$50 per day) to cover length of stay. 
• Return travel or airline tickets.
• A covering letter specifying the purpose of the trip and the dates of entry and departure. 
• you need an invitation from the company or person who is arranging the conference.

For more details on application of Visa, please visit the below provided link

http://www.davidsonmorris.com/mexico-visa/