2027 ICD-10-CM Diagnosis Code I49.89Other specified cardiac arrhythmias not elsewhere classified
I49.89 is a billable ICD-10-CM diagnosis code for other specified cardiac arrhythmias not elsewhere classified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 308 through 310.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Ankyrin-B syndrome
- Atrial arrhythmia
- Atrial escape complex
- Atrial rhythm
- AV junctional arrest
- AV junctional rhythm
- AV node arrhythmia
- AV-junctional bradycardia
- Bradyarrhythmia
- Calcium release deficiency syndrome
- Chronic atrial and intestinal dysrhythmia
- Chronic intestinal pseudo-obstruction
- Congenital conductive hearing loss
- Ectopic rhythm
- Finding related to awareness of heart beat
- Fluttering heart
- Left atrial rhythm
- Marked sinus arrhythmia
- Nodal rhythm disorder
- Palpitations
- Phocomelia
- Phocomelia, ectrodactyly, deafness and sinus arrhythmia syndrome
- Postoperative fluttering heart
- Short QT syndrome
- Sick sinus syndrome
- Slow ventricular response
- Stable bradyarrhythmia
- Supraventricular bradyarrhythmia
- Tic-tac rhythm
- Wandering atrial pacemaker
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I49.89: its own notes plus those printed at I49 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Coronary sinus rhythm disorder
- Ectopic rhythm disorder
- Nodal rhythm disorder
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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.-)
Code First
The underlying condition named in the note is sequenced before this code.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Arrhythmia (auricle) (cardiac) (juvenile) (nodal) (reflex) (supraventricular) (transitory) (ventricle) I49.9
sinus I49.89
specified NEC I49.89
Bradyarrhythmia, cardiac I49.89
Nodal rhythm I49.89
atrioventricular nodal I49.89
coronary sinus I49.89
ectopic I49.89
nodal I49.89
nodal I49.89
Sinus See Also: Fistula;
arrhythmia I49.89
pacemaker (heart) I49.89
Clinical InformationClinical
Bradycardia
cardiac arrhythmias that are characterized by excessively slow heart rate, usually below 50 beats per minute in human adults. they can be classified broadly into sinoatrial node dysfunction and atrioventricular block.
Code History & ChangesHistory
New Code I49.89 was added to the ICD-10-CM code set for FY 2027, effective October 1, 2026.
Replacement I49.89 replaces the following previously assigned code(s):
- I49.8 - Other specified cardiac arrhythmias
Questions About I49.89Overview
What is the ICD-10 code for other specified cardiac arrhythmias not elsewhere classified?
The ICD-10-CM code for other specified cardiac arrhythmias not elsewhere classified is I49.89 (sometimes written as I4989). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I49.89 (Other specified cardiac arrhythmias) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified cardiac arrhythmias not elsewhere classified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I49.89 group to?
When other specified cardiac arrhythmias not elsewhere classified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 309, 310, 308, with relative weights from 0.5686 to 1.1809 depending on complications. Higher weights mean higher Medicare reimbursement.
