Inpatient Guidelines and UHDDS Concepts
Key Takeaways
- The principal diagnosis is the condition established after study as chiefly responsible for the inpatient admission.
- Additional diagnoses must meet UHDDS reporting criteria, not merely appear in a problem list.
- Uncertain diagnoses documented at discharge are handled differently for inpatient admissions than for outpatient encounters.
- POA indicators are assigned after code selection and depend on documentation and provider judgment.
Inpatient Guideline Frame
Inpatient coding uses ICD-10-CM for diagnoses and ICD-10-PCS for inpatient hospital procedures. For diagnosis sequencing, Section II of the ICD-10-CM Official Guidelines controls principal diagnosis selection for non-outpatient settings, and Section III controls additional diagnoses.
The principal diagnosis is the condition established after study to be chiefly responsible for the admission. Do not default to the admitting symptom, the first condition listed, or the condition with the highest reimbursement. Read the workup, treatment, discharge summary, and final diagnostic statement.
Additional diagnoses are reportable when they coexist at admission, develop later, or affect care. A condition generally meets UHDDS criteria when it requires clinical evaluation, therapeutic treatment, diagnostic procedures, extended length of stay, or increased nursing care or monitoring.
Prior conditions with no bearing on the current stay are not reported unless facility policy requires them. Abnormal lab, x-ray, or pathology findings are not reported unless the provider documents their clinical significance or clarification is obtained.
For inpatient acute, long-term care, and psychiatric hospital admissions, uncertain diagnoses documented at discharge as probable, suspected, likely, possible, still to be ruled out, compatible with, or consistent with are coded as if established. This inpatient rule does not apply to outpatient coding.
POA reporting asks whether the final reported diagnosis was present at the time the inpatient admission order occurred. Conditions that develop during ED, observation, or outpatient surgery before the inpatient order are considered present on admission. Query when timing or linkage is unclear.
| Decision | Inpatient focus |
|---|---|
| Principal diagnosis | After-study reason for admission |
| Secondary diagnosis | UHDDS impact on care |
| Uncertain diagnosis | Code if documented at discharge in an applicable inpatient setting |
| POA | Present when inpatient admission order occurred |
A patient is admitted with chest pain. After cardiac workup, the discharge summary documents acute inferior wall myocardial infarction as the final diagnosis. What should drive principal diagnosis selection?
Which condition best meets UHDDS criteria for reporting as an additional inpatient diagnosis?
At discharge from an acute inpatient admission, the provider documents probable gram-negative pneumonia and the patient received pneumonia treatment. How is the diagnosis coded for the inpatient facility claim?