Alphabetic Index FY2027

I49.1

Atrial premature depolarization

FY2027Chapter 9: Diseases of the circulatory system/I30–I5A Other forms of heart disease

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - Cardiac and Circulatory

I49.1 (also written I491) is a billable ICD-10-CM diagnosis code for atrial premature depolarization. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 12 codes in category I49 (Other cardiac arrhythmias). The Alphabetic Index lists it under 16 entries. Its coding notes include a Code first instruction and 15 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

Inherited from I49 Other cardiac arrhythmias
  • cardiac arrhythmia complicating:
    • abortion or ectopic or molar pregnancy (O00-O07, O08.8)
    • obstetric surgery and procedures (O75.4)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from I49 Other cardiac arrhythmias
  • bradycardia NOS (R00.1)
  • neonatal dysrhythmia (P29.1-)
  • sinoatrial bradycardia (R00.1)
  • sinus bradycardia (R00.1)
  • vagal bradycardia (R00.1)
Also from chapter/block level (10 notes)
Inherited from Chapter 9 Diseases of the circulatory system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Cardiac and Circulatory clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

Inclusion terms

Conditions classified to this code.

This code
  • Atrial premature beats

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 16 entries

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