•Principal procedure: - This type of procedure is performed for definitive treatment rather than
for diagnostic or exploratory purposes, or when it is necessary to take care of a complication. If two
procedures appear to be principal, the one most related to the principal diagnosis should be selected as
the principal procedure.
•Physician identification: - The unique number assigned to each physician within the hospital (the
attending physician and the operating physician [if applicable] are both to be identified)
•Admission and discharge dates -
•Comorbidity: - This is defined as a pre-existing condition that, because of its presence with a
specific principal diagnosis, will likely cause an increase in the patient's length of stay in the hospital.
•Complication: - This is defined as an additional diagnosis that describes a condition arising after
the beginning of hospital observation and treatment and then modifying the course of the patient's
illness or the medical care required.
•Date of birth -
•Diagnoses: - All diagnoses affecting the current hospital stay must be reported as part of the
UHDDS.
•Disposition of patient: - The destination of the patient upon leaving the hospital—discharged to
home, left against medical advice, discharged to another short-term hospital, discharged to a long-term
care institution, died, or other
•Ethnicity (Hispanic-Non-Hispanic) -
•Expected payer: - The single major source expected by the patient to pay for this bill (for
example, Blue Cross/Blue Shield, Medicare, Medicaid, workers' compensation)