I49.89 — Other specified cardiac arrhythmias not elsewhere classified
Is I49.89 billable?
Yes, but I49.89 is an unspecified code. I49.89 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, I49.89 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting I49.89 — the more specific alternatives are listed below.
More specific alternatives
I49.89 at a glance
| Code | I49.89 |
|---|---|
| Description | Other specified cardiac arrhythmias not elsewhere classified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| FY2027 change | New in FY2027 |
Which MS-DRGs does I49.89 group to?
I49.89 sits in MDC 05 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 308Cardiac Arrhythmia and Conduction Disorders with MCCmedical
- 309Cardiac Arrhythmia and Conduction Disorders with CCmedical
- 310Cardiac Arrhythmia and Conduction Disorders without CC/MCCmedical
How is I49.89 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to I49.89. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Bradyarrhythmia, cardiac
- Nodal rhythm
- Arrhythmia › sinus (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)
- Arrhythmia › specified NEC (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)
- Fibrillation › cardiac
- Fibrillation › heart
- Flutter › heart
- Rhythm › atrioventricular nodal
- Rhythm › nodal
- Sinus › arrhythmia
- Wandering › pacemaker
- Rhythm › disorder › coronary sinus
Inclusion terms
Alternative wording in documentation that is classified to I49.89.
- Coronary sinus rhythm disorder
- Ectopic rhythm disorder
- Nodal rhythm disorder
Code first — inherited from I49
The underlying condition below must be sequenced before I49.89. I49.89 describes a manifestation and cannot be the principal or first-listed diagnosis.
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I49.89, but a patient may have both at the same time. When documentation supports it, I49.89 and the excluded code may both be reported.
- 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.-)
Excludes2 — not included here — inherited from I49
The conditions below are not part of I49.89, but a patient may have both at the same time. When documentation supports it, I49.89 and the excluded code may both be reported.