It said that an agreement was being reached for testing to be carried out by international sports federations while the country remained non-compliant.
"This will ensure that effective testing programmes can be run in the lead-up to the (Rio) Olympic and Paralympic Games," added WADA.
Regarding Mexico, WADA acknowledged government efforts and said it was "hopeful that the necessary work will be completed in the very near future".
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Belgian, French, Greek and Brazilian anti-doping agencies were declared fully compliant after resolving code-related issues.
Brazil passed key anti-doping legislation on Thursday that avoided the embarrassing possibility of the country being in breach of the rules at its own Olympic Games in August.
(Reporting by Alan Baldwin, editing by Clare Fallon)
