New for FY2027 ICD-10-CM · October 1, 2026
I49.89: Other specified cardiac arrhythmias not elsewhere classified
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Other specified cardiac arrhythmias not elsewhere classified. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: I00-I99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: I00-I99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: I00-I99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: I00-I99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: I00-I99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: I00-I99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: I00-I99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: I00-I99 (chapter, inherited).
Excludes2
systemic connective tissue disorders (M30-M36)
Source: I00-I99 (chapter, inherited).
Excludes2
transient cerebral ischemic attacks and related syndromes (G45.-)
Source: I00-I99 (chapter, inherited).
Code first
cardiac arrhythmia complicating:
Source: I49 (category, inherited).
Code first
abortion or ectopic or molar pregnancy (O00-O07, O08.8)
Source: I49 (category, inherited).
Code first
obstetric surgery and procedures (O75.4)
Source: I49 (category, inherited).
Excludes2
bradycardia NOS (R00.1)
Source: I49 (category, inherited).
Excludes2
neonatal dysrhythmia (P29.1-)
Source: I49 (category, inherited).
Excludes2
sinoatrial bradycardia (R00.1)
Source: I49 (category, inherited).
Excludes2
sinus bradycardia (R00.1)
Source: I49 (category, inherited).
Excludes2
vagal bradycardia (R00.1)
Source: I49 (category, inherited).
Instructional note
Coronary sinus rhythm disorder
Source: I49.89 (self, direct).
Instructional note
Ectopic rhythm disorder
Source: I49.89 (self, direct).
Instructional note
Nodal rhythm disorder
Source: I49.89 (self, direct).
Compare the FY2027 additions, removals and billable-status changes
What does I49.89 mean in FY2027?
The official ICD-10-CM descriptor is Other specified cardiac arrhythmias not elsewhere classified. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
When did I49.89 become an ICD-10-CM code?
I49.89 is new for FY2027 ICD-10-CM, effective October 1, 2026. It is absent from the FY2026 April order file. Use the code set that applies to the encounter or inpatient discharge date, and check the official Tabular instructions.
Is I49.89 billable in FY2027?
The FY2027 order file marks I49.89 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does I49.89 map to an HCC?
I49.89 is not in the current CMS mapping file (it is new for FY2027), and CMS has not yet published payment year 2028 mappings. No HCC category or RAF coefficient is shown.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.