Intensive Outpatient Treatment (also known as IOP for Intensive Outpatient Program) is a primary treatment program recommended in some circumstances by a clinical and medical assessment. IOP may be recommended for those who do not need medically-supervised detox.
The genitive is the case (or function) of an inflected form of a noun or pronoun showing ownership, measurement, association, or source. Adjective: genitival. The suffix -'s on nouns is a marker of genitive case in English. Genitive case can also be indicated by an of phrase after a noun.
Note: The word to is not a preposition. It is often called the sign of the infinitive. An infinitive is a non-finite verb. In other words, it cannot be the main verb in a sentence. An infinitive can be used as a noun, an adjective or an adverb. Here are some examples of infinitive verbs as nouns: Compare it to this: Here is another example: Compare it to this: An adjective modifies a noun to tell us something about the noun (e.g., its colour, type, or number).