464 Acute laryngitis and tracheitis (464.00-464.51) ICD-9-CM
The 464.00-464.51 block classified 464 acute laryngitis and tracheitis with 11 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 464.00-464.51 Block 11 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.
- 464.00 Ac laryngitis w/o obst
- 464.01 Ac laryngitis w obstruct
- 464.10 Ac tracheitis no obstruc
- 464.11 Ac tracheitis w obstruct
- 464.20 Ac laryngotrach no obstr
- 464.21 Ac laryngotrach w obstr
- 464.30 Ac epiglottitis no obstr
- 464.31 Ac epiglottitis w obstr
- 464.4 Croup
- 464.50 Supraglottis w/o obs NOS
- 464.51 Supraglottis w obstr NOS
Questions About This Page
Are the 464.00-464.51 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 464.00-464.51 block classify?
The block classified 464 acute laryngitis and tracheitis with 11 codes in the final ICD-9-CM release. It sat under Diseases of the respiratory system (460–519) 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.
