CMS Pub. 100-02, ch. 2, § 20

In accordance with 42 CFR 412.27(c), for all IPFs, a provisional or admitting diagnosis

must be made on every patient at the time of admission, and must include the diagnosis

of comorbid conditions as well as the psychiatric diagnosis. The reasons for admission

must be clearly documented as stated by the patient or others significantly involved, or

both.

Psychiatric hospitals are required to be primarily engaged in providing, by or under the

supervision of a psychiatrist, psychiatric services for the diagnosis and treatment of

mentally ill persons, according to 42 CFR 412.23(a). Distinct part psychiatric units of

acute care hospitals and CAHs are required to admit only those patients whose admission

to the unit is required for active treatment, of an intensity that can be provided

appropriately only in an inpatient hospital setting, of a psychiatric principal diagnosis that

is listed in the International Classification of Diseases, Tenth Revision, Clinical

Modification.

As a condition for Medicare payment, all admissions to IPFs must be certified and

recertified by a physician, as detailed in section 30.2.1.