Summary & Overview
HCPCS G9798: AMI Discharge Between July 1 Prior Year and June 30 Measurement Year
HCPCS Level II code G9798 identifies discharges for acute myocardial infarction (AMI) that occur between July 1 of the year prior to the measurement period and June 30 of the measurement period. The code is used in national quality measurement and reporting frameworks to define the eligible AMI discharge cohort for performance assessment. Its consistent use matters for accurate denominator construction in measures tied to AMI care processes and outcomes.
Major national payers referenced in analyses typically include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. These payers use standardized discharge flags and quality reporting codes to align claims-based measurement across plans.
Readers will find benchmarks and reporting context for how G9798 is used to delineate measurement cohorts, summaries of payer coverage practices, and clinical context about why capturing the precise discharge window (July 1 to June 30) affects longitudinal quality measurement. The publication outlines policy considerations around claim-level coding for AMI discharges, the implications for performance measurement timing, and operational notes for mapping inpatient discharge records into quality reporting datasets. Data not available in the input is noted where applicable.
Billing Code Overview
HCPCS Level II code G9798 documents discharges for acute myocardial infarction (AMI) that occurred between July 1 of the year prior to the measurement period and June 30 of the measurement period. This code captures a cohort of AMI discharges for quality measurement and reporting purposes.
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Service type: Quality measurement / discharge event tracking
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Typical site of service: Inpatient hospital discharge
Data not available in the input for payers, associated taxonomies, ICD-10 diagnoses, related codes, and service line.
Clinical & Coding Specifications
Clinical Context
A typical patient is a 62-year-old male admitted to an acute care hospital with an ST-elevation myocardial infarction (STEMI) on March 10 of the measurement period. He receives emergent reperfusion therapy, cardiac monitoring, and inpatient cardiology care. After stabilization and completion of in-hospital treatment, he is discharged home on March 16 with prescriptions, discharge instructions, and follow-up cardiology appointments. The billing code G9798 is used to identify a discharge for acute myocardial infarction (AMI) that occurs between July 1 of the year prior to the measurement year and June 30 of the measurement year for quality reporting and population measurement programs. Typical workflow includes documentation of admission and discharge diagnoses, treatment summary, reconciliation of medications, cardiovascular secondary prevention counseling, and submission of the appropriate discharge code for administrative and reporting purposes.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when substantially greater work is performed beyond typical services documented in operative or procedure notes affecting billing for services around AMI care (rare for pure discharge reporting). |