I49.8 — Other specified cardiac arrhythmias
Can I still bill I49.8?
No — I49.8 stopped being billable on October 1, 2026. I49.8 still exists in ICD-10-CM but was subdivided for FY2027 and became a non-billable header code. Because I49.8 still appears in a code lookup, this change is easy to miss — but submitting it on or after October 1, 2026 will be denied for lack of specificity. Use one of the more specific codes below instead.
I49.8 at a glance
| Code | I49.8 |
|---|---|
| Description | Other specified cardiac arrhythmias |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| FY2027 change | Subdivided in FY2027 — no longer billable |
Code first — inherited from I49
The underlying condition below must be sequenced before I49.8. I49.8 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 I49.8, but a patient may have both at the same time. When documentation supports it, I49.8 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 I49.8, but a patient may have both at the same time. When documentation supports it, I49.8 and the excluded code may both be reported.
What codes fall under I49.8? (3)
How long has I49.8 existed?
I49.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.