427 Cardiac dysrhythmias (427.0-427.9) ICD-9-CM
The 427.0-427.9 block classified 427 cardiac dysrhythmias with 14 legacy diagnosis codes. None remain valid for claim submission; each code below links to its reference page with the official ICD-10-CM replacement under the CMS General Equivalence Mappings.
Retired Code Set
ICD-9-CM stopped being valid for U.S. claims with dates of service on or after October 1, 2015, when ICD-10-CM replaced it. Use this index for historical lookups and crosswalking; for current coding, start from the ICD-10-CM codes list or the ICD-9 / ICD-10 converter.
Legacy Codes in the 427.0-427.9 Block 14 codes
None of these codes remain valid for claim submission. Each code page shows its ICD-10-CM replacement under the CMS General Equivalence Mappings.
- 427.0 Parox atrial tachycardia
- 427.1 Parox ventric tachycard
- 427.2 Parox tachycardia NOS
- 427.31 Atrial fibrillation
- 427.32 Atrial flutter
- 427.41 Ventricular fibrillation
- 427.42 Ventricular flutter
- 427.5 Cardiac arrest
- 427.60 Premature beats NOS
- 427.61 Atrial premature beats
- 427.69 Premature beats NEC
- 427.81 Sinoatrial node dysfunct
- 427.89 Cardiac dysrhythmias NEC
- 427.9 Cardiac dysrhythmia NOS
Questions About This Page
Are the 427.0-427.9 codes still billable?
No. Every code in this block became invalid for U.S. claims after September 30, 2015. Each code page linked above shows the ICD-10-CM replacement CMS assigned in the General Equivalence Mappings, and the ICD-9 / ICD-10 converter translates any of them directly.
What did the 427.0-427.9 block classify?
The block classified 427 cardiac dysrhythmias with 14 codes in the final ICD-9-CM release. It sat under Diseases of the circulatory system (390–459) in the legacy hierarchy.
Related References
Source: final CMS ICD-9-CM release (version date October 1, 2014). Retired from U.S. claims after September 30, 2015.
