Encounter dates beginning 01-01-23 (1Q23) and moving forward until updated
OP-23: Head CT or MRI Scan Results for Acute Ischemic Stroke or Hemorrhagic Stroke Patients who Received Head CT or MRI Scan Interpretation Within 45 Minutes of ED Arrival
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Quarterly Sampling |
OP-23 has the option of “Sampling” or “Not Sampling”. If a hospital selects “Sampling”, then the sum of the Hospital Sample Size from all three months of the quarter must meet the minimal requirement as defined in the following table. There is no “Monthly” sampling for OP-23.
Quarterly Sample Size (OP-23) If Average Quarterly Initial Patient Sample Group Size “N” equals: |
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≥10,001 then minimum Required Sample Size “n” =377 |
5,001–10,000 then minimum Required Sample Size “n” = 370 |
4,001–5,000 then minimum Required Sample Size “n” = 357 |
3,001–4,000 then minimum Required Sample Size “n” = 351 |
2,001–3,000 then minimum Required Sample Size “n” = 341 |
1,001–2,000 then minimum Required Sample Size “n” = 323 |
901–1,000 then minimum Required Sample Size “n” = 278 |
801–900 then minimum Required Sample Size “n” = 270 |
701–800 then minimum Required Sample Size “n” = 260 |
601–700 then minimum Required Sample Size “n” = 249 |
501–600 then minimum Required Sample Size “n” = 235 |
451–500 then minimum Required Sample Size “n” = 218 |
426–450 then minimum Required Sample Size “n” = 208 |
401–425 then minimum Required Sample Size “n” = 203 |
376–400 then minimum Required Sample Size “n” = 197 |
351–375 then minimum Required Sample Size “n” = 191 |
326–350 then minimum Required Sample Size “n” = 184 |
301–325 then minimum Required Sample Size “n” = 177 |
276–300 then minimum Required Sample Size “n” = 169 |
251–275 then minimum Required Sample Size “n” = 161 |
226–250 then minimum Required Sample Size “n” = 152 |
201–225 then minimum Required Sample Size “n” = 143 |
176–200 then minimum Required Sample Size “n” = 132 |
151–175 then minimum Required Sample Size “n” = 121 |
126–150 then minimum Required Sample Size “n” = 109 |
101–125 then minimum Required Sample Size “n” = 95 |
81–100 then minimum Required Sample Size “n” = 80 |
≤ 80 then Use all cases |