426 Conduction disorders (426.0-426.9) ICD-9-CM
The 426.0-426.9 block classified 426 conduction disorders with 19 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 426.0-426.9 Block 19 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.
- 426.0 Atriovent block complete
- 426.10 Atriovent block NOS
- 426.11 Atriovent block-1st degr
- 426.12 Atrioven block-mobitz ii
- 426.13 Av block-2nd degree NEC
- 426.2 Left bb hemiblock
- 426.3 Left bb block NEC
- 426.4 Rt bundle branch block
- 426.50 Bundle branch block NOS
- 426.51 Rt bbb/lft post fasc blk
- 426.52 Rt bbb/lft ant fasc blk
- 426.53 Bilat bb block NEC
- 426.54 Trifascicular block
- 426.6 Other heart block
- 426.7 Anomalous av excitation
- 426.81 Lown-ganong-levine synd
- 426.82 Long QT syndrome
- 426.89 Conduction disorder NEC
- 426.9 Conduction disorder NOS
Questions About This Page
Are the 426.0-426.9 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 426.0-426.9 block classify?
The block classified 426 conduction disorders with 19 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.
