MS-DRG 309Medical

Cardiac Arrhythmia and Conduction Disorders with CC

Major Diagnostic Category 05·Grouped by diagnosis·FY 2027

MS-DRG 309 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 05 (MDC 05) with a Complication or Comorbidity (CC). It maps to 61 ICD-10-CM diagnosis codes. For FY 2027 it carries a relative weight of 0.7316 with a geometric mean length of stay of 2.2 days and an arithmetic mean of 2.7 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

FY 2027 payment data

From Table 5 of the FY 2027 IPPS Final Rule (CMS).

Relative weight:: 0.7316 (payment multiplier vs. the average case (1.0))
Geometric mean stay:: 2.2 days (used for transfer payments)
Average stay:: 2.7 days (arithmetic mean)
Post-acute transfer policy:: No (not subject to it)

Same condition, other severity levels

CMS splits one condition into separate DRGs by how sick the patient is. With MCC pays more than with CC, which pays more than without CC/MCC.

DRG	Title	Relative weight	Mean stay
308	Cardiac Arrhythmia and Conduction Disorders with MCC	1.1806	3.3 days
309	Cardiac Arrhythmia and Conduction Disorders with CC (this page)	0.7316	2.2 days
310	Cardiac Arrhythmia and Conduction Disorders without CC/MCC	0.5680	1.8 days

Diagnosis codes (61)

As the principal diagnosis, these ICD-10-CM codes can group to DRG 309. 100% of the codes listed are billable.