Inpatient detoxification admissions are typically brief, on the order of a few days, and may or may not be followed by a longer inpatient period of rehabilitation. Medically supervised inpatient detoxification would be needed for somebody with severe alcohol or sedative hypnotic (benzodiazepine, barbiturate) dependence, especially if he has a history of withdrawal seizures, significant changes in blood pressure or pulse, or delirium tremens (DTs). These are also the major conditions for which insurance companies are likely to reimburse.
Opiate detoxification, often with the use of buprenorphine (Suboxone, Subutex) or methadone, may also be done in an inpatient setting, as well as on an outpatient basis.
While the physiological withdrawal from cocaine, including crack, is not life-threatening, many individuals seek an inpatient admission as a means to break the cycle of a severe addiction.