title: Inpatient psychiatric treatment of elderly Medicare beneficiaries.
abstract: OBJECTIVE
  The clinical characteristics and treatment patterns of elderly Medicare beneficiaries hospitalized for psychiatric disorders were examined.
  
  
  METHODS
  Administrative data on all elderly Medicare beneficiaries in the United States hospitalized in a nonfederal hospital for a primary psychiatric disorder in 1990-1991 were used to calculate descriptive statistics on case-mix by age group, hospital type (psychiatric hospital, general hospital psychiatric unit, or general hospital nonpsychiatric unit), and primary diagnosis. Length of stay, costs, and discharge destination by hospital type and primary diagnosis were also determined.
  
  
  RESULTS
  A total of .6 percent of elderly Medicare beneficiaries were hospitalized for a psychiatric disorder in 1990, accounting for more than 240,000 admissions and $1 billion in Medicare payments. The most common reasons for hospitalization were major depressive disorder (28.1 percent), dementia and other organic disorders (26.8 percent), and substance-related disorders (12.6 percent). Organic disorders were particularly prevalent among the oldest old, accounting for more than half of psychiatric admissions among those 85 and older. A total of 43 percent of the psychiatric admissions were to general hospital nonpsychiatric units, 38 percent to general hospital psychiatric units, and only 19 percent to psychiatric hospitals. Within each diagnostic category, patients admitted to general hospital nonpsychiatric units had the shortest average lengths of stay and the lowest average costs. Among beneficiaries with organic, affective, and psychotic disorders other than schizophrenia, those admitted to general hospitals had shorter lengths of stay, higher rates of discharge to nursing homes, and lower rates of discharge to self-care than those treated in psychiatric hospitals.
  
  
  CONCLUSIONS
  Case-mix-adjusted treatment patterns varied substantially across hospital types, due to differences in either illness severity or treatment styles.
authors.affiliation: Department of Health Care Policy, Harvard Medical School, Boston, MA 02115, USA. ettner@hcp.med.harvard.edu
authors.forename: S L
authors.initials: SL
authors.lastname: Ettner
authors.forename: R C
authors.initials: RC
authors.lastname: Hermann
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D016208:Databases, Factual / Q000706:statistics & numerical data; D003953:Diagnosis-Related Groups / Q000191:economics / Q000706:statistics & numerical data; D005852:Geriatric Psychiatry / Q000191:economics / Q000706:statistics & numerical data; D017721:Hospital Costs / Q000706:statistics & numerical data; D006760:Hospitalization / Q000191:economics / Q000706:statistics & numerical data; D006778:Hospitals, Psychiatric / Q000191:economics / Q000706:statistics & numerical data*; D006801:Humans; D006278:Medicare / Q000706:statistics & numerical data*; D001523:Mental Disorders / Q000191:economics* / Q000453:epidemiology / Q000628:therapy; D010351:Patient Discharge / Q000706:statistics & numerical data; D011567:Psychiatric Department, Hospital / Q000191:economics / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D014481:United States / Q000453:epidemiology