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Specifications Manual for Joint Commission National Quality Measures (v2015A)
Home » Acute Myocardial Infarction (AMI)

Release Notes:
Measure Information Form
Version 2015A


Acute Myocardial Infarction (AMI)

Set Measures

Set Measure ID Measure Short Name
AMI-1 Aspirin at Arrival
AMI-10 Statin Prescribed at Discharge
AMI-2 Aspirin Prescribed at Discharge
AMI-3 ACEI or ARB for LVSD
AMI-5 Beta-Blocker Prescribed at Discharge
AMI-7 Median Time to Fibrinolysis
AMI-7a Fibrinolytic Therapy Received Within 30 Minutes of Hospital Arrival
AMI-8 Median Time to Primary PCI
AMI-8a Primary PCI Received Within 90 Minutes of Hospital Arrival

General Data Elements

Element Name Collected For
Admission Date All Records,
Birthdate All Records,
CMS Certification Number Hospital Clinical Data File, Optional for All Records,
Discharge Date All Records, Not collected for HBIPS-2 and HBIPS-3
Health Care Organization Identifier All Records, Aggregate Data File, Patient Population Data File, Hospital Clinical Data File,
Hispanic Ethnicity All Records,
ICD-9-CM Other Diagnosis Codes All Records, Optional for HBIPS-2, HBIPS-3
ICD-9-CM Other Procedure Codes All Records, Optional for All HBIPS Records
ICD-9-CM Other Procedure Dates All Records, Optional for All HBIPS and PBM Records
ICD-9-CM Principal Diagnosis Code All Records, Optional for HBIPS-2 and HBIPS-3
ICD-9-CM Principal Procedure Code All Records, Optional for All HBIPS Records
ICD-9-CM Principal Procedure Date All Records, Optional for All HBIPS and PBM Records
Payment Source All Records, Optional for HBIPS-2 and HBIPS-3
Race All Records,
Sex All Records,

Algorithm Output Data Elements

Element Name Collected For
Measure Category Assignment Calculation, Transmission, Hospital Clinical Data File
Measurement Value Calculation, Transmission, Hospital Clinical Data File

Measure Set Specific Data Elements

Element Name Collected For
Aspirin Prescribed at Discharge AMI-2,
Clinical Trial AMI-10, AMI-2,
Comfort Measures Only AMI-10, AMI-2,
Discharge Disposition AMI-10, AMI-2,
LDL-c Less Than 100 mg/dL AMI-10,
Reason for No Aspirin at Discharge AMI-2,
Reason for Not Prescribing Statin Medication at Discharge AMI-10,
Statin Medication Prescribed at Discharge AMI-10,


Related Materials

 Sorted ascending Document Name  
Acknowledgment and Conditions of Use  
Appendix A - ICD-9-CM Code Tables  
Appendix C - Medication Tables  
Appendix D - Glossary of Terms  
Appendix E - Overview of Measure Information Form and Flowchart Formats  
Appendix G - Resources  
Appendix H - Miscellaneous Tables  
Appendix P - preview section of ICD-10 Code Tables  
Appendix P - preview section of ICD-10 Crosswalks of code tables  
b. Data Dictionary  
Cover Page for the Joint Commission Manual  
Introduction to the Manual  
Missing and Invalid Data  
Sampling  
Table of Contents  
Transmission Alpha Data Dictionary  
Transmission Data Processing Flow: Clinical  
Transmission Data Processing Flow: Population and Sampling  
Transmission of Data  
Using the The Joint Commission's National Measure Specifications Manual  



Acute Myocardial Infarction (AMI) Initial Patient Population

The population of the AMI measure set is identified using 4 data elements:
  • ICD-9-CM Principal Diagnosis Code
  • Admission Date
  • Birthdate
  • Discharge Date

Patients admitted to the hospital for inpatient acute care with an ICD-9-CM Principal Diagnosis Code for AMI as defined in Appendix A Table 1.1, a Patient Age (Admission Date minus Birthdate) greater than or equal to 18 years and a Length of Stay (Discharge Date minus Admission Date) less than or equal to 120 days are included in the AMI Initial Patient Population and are eligible to be sampled.

Note: The Joint Commission requires all AMI measures to be collected and submitted as an entire measure set. Measures are specified in the aligned Specifications Manual for National Hospital Inpatient Quality Measures as well as in the Specifications Manual for Joint Commission National Quality Core Measures. The initial population and sampling should be determined for all of a hospital’s cases for the entire set, not at the individual measure level, even though individual measures are defined within the different manuals.

AMI_Initial_Patient_Pop.jpg v2



AMI Sample Size Requirements

Hospitals that choose to sample have the option of sampling quarterly or sampling monthly. A hospital may choose to use a larger sample size than is required. Hospitals whose Initial Patient Population size is less than the minimum number of cases per quarter for the measure set cannot sample. Hospitals that have five or fewer AMI discharges (both Medicare and non-Medicare combined) in a quarter are not required to submit AMI patient level data to the QIO Clinical Warehouse and Joint Commission’s Data Warehouse.

Regardless of the option used, hospital samples must be monitored to ensure that sampling procedures consistently produce statistically valid and useful data. Due to exclusions, hospitals selecting sample cases MUST submit AT LEAST the minimum required sample size.

The following sample size tables for each option automatically build in the number of cases needed to obtain the required sample sizes. For information concerning how to perform sampling, refer to the Population and Sampling Specifications section in this manual.

Quarterly Sampling

Hospitals performing quarterly sampling for AMI must ensure that its Initial Patient Population and sample size meet the following conditions:

Quarterly Sample Size
Based on Initial Patient Population for the AMI Measure Set
Hospital's Measures
Average Quarterly
Initial Patient Population
“Size "N"”
Minimum Required
Sample Size
"“n"”
>= 1551 311
391 - 1550 20% of the Initial Patient Population
78 -390 78
6 - 77 No sampling; 100% of the Initial Patient Population required
0 - 5 Submission of patient level data is encouraged but not required:
-CMS: if submission occurs, 1 – 5 cases of the Initial Patient Population may be submitted
-The Joint Commission: if submission occurs, 100% Initial Patient Population required

Monthly Sampling

Hospitals performing monthly sampling for AMI must ensure that its Initial Patient Population and sample size meet the following conditions:

Monthly Sample Size
Based on Initial Patient Population for the AMI Measure Set
Hospital's Measures
Average Monthly
Initial Patient Population
Size "“N"”
Minimum Required
Sample Size
“"n"”
>= 516 104
131 -– 515 20% of the Initial Patient Population
26 -– 130 26
< 26 No sampling; 100% of the Initial Patient Population required

Sample Size Examples

  • Quarterly sampling:
    • A hospital'’s AMI Initial Patient Population size is 100 patients during the fourth quarter. The required sample size is seen to be a minimum of 78 AMI patients for this quarter.
    • A hospital’'s AMI Initial Patient Population size is 392 patients during the third quarter. The required sample size is 20% of the patient population or 79 cases for the quarter (twenty percent of 392 equals 78.4 rounded to the next highest whole number equals 79).
    • A hospital’'s AMI Initial Patient Population is 4 patients during the first quarter. Submission of patient level data is not required. If the hospital chooses to submit patient level data:
      • CMS: the quarterly sample size would be 1 -– 4 cases for the quarter
      • The Joint Commission: the required quarterly sample size would be 100% of the patient population or 4 cases for the quarter.

  • Monthly sampling:
    • A hospital'’s AMI Initial Patient Population size is 516 patients during March. The required sample size is 104 cases from the patient population.
    • A hospital'’s AMI Initial Patient Population size is 502 patients during July. The required sample size is 20% of the patient population or 101 cases for the month (twenty percent of 502 equals 100.4 rounded to the next highest whole number equals 101).

Measure Information Form AMI
Specifications Manual for Joint Commission National Quality Measures (v2015A)
Discharges 01-01-15 (1Q15) through 09-30-15 (3Q15)

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