ICD-10 · PDGM grouping
I49 Other cardiac arrhythmias
All 12 codes in the I49 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
12
Can lead a claim
12
Cannot lead a claim
0
What CMS assigns to I49
All 12 codes group to MMTA - Cardiac and Circulatory. 5 of the 12 count toward the Dysrhythmias, includes Atrial fibrillation and Atrial flutter comorbidity subgroup; 7 are assigned none. Every code can lead a claim. CMS attaches a code-first note to all 12.
- Dysrhythmias, includes Atrial fibrillation and Atrial flutter: can award the low comorbidity tier as a secondary diagnosis.
Code first
CMS grouper convention 71, on all 12 codes. Code first:
- abortion or ectopic or molar pregnancy (O00-O07, O08.8)
- obstetric surgery and procedures (O75.4)
- tachycardia complicating:
Every code in I49
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| I49.0 Ventricular fibrillation and flutter | ||||
| I49.01 | Ventricular fibrillation | Can lead a claim, code first applies | H | None |
| I49.02 | Ventricular flutter | Can lead a claim, code first applies | H | None |
| I49.1 | Atrial premature depolarization | Can lead a claim, code first applies | H | None |
| I49.2 | Junctional premature depolarization | Can lead a claim, code first applies | H | None |
| I49.3 | Ventricular premature depolarization | Can lead a claim, code first applies | H | None |
| I49.4 Other and unspecified premature depolarization | ||||
| I49.40 | Unspecified premature depolarization | Can lead a claim, code first applies | H | None |
| I49.49 | Other premature depolarization | Can lead a claim, code first applies | H | None |
| I49.5 | Sick sinus syndrome | Can lead a claim, code first applies | H | Dysrhythmias, includes Atrial fibrillation and Atrial flutter |
| I49.8 Other specified cardiac arrhythmias | ||||
| I49.81 | Brugada syndrome | Can lead a claim, code first applies | H | Dysrhythmias, includes Atrial fibrillation and Atrial flutter |
| I49.82 | Ventricular bigeminy | Can lead a claim, code first applies | H | Dysrhythmias, includes Atrial fibrillation and Atrial flutter |
| I49.89 | Other specified cardiac arrhythmias not elsewhere classified | Can lead a claim, code first applies | H | Dysrhythmias, includes Atrial fibrillation and Atrial flutter |
| I49.9 | Cardiac arrhythmia, unspecified | Can lead a claim, code first applies | H | Dysrhythmias, includes Atrial fibrillation and Atrial flutter |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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