327 Organic sleep disorders (327.00-327.8) ICD-9-CM
The 327.00-327.8 block classified 327 organic sleep disorders with 40 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 327.00-327.8 Block 40 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.
- 327.00 Organic insomnia NOS
- 327.01 Insomnia in other dis
- 327.02 Insomnia dt mental disor
- 327.09 Organic insomnia NEC
- 327.10 Organic hypersomnia NOS
- 327.11 Idio hypersom-long sleep
- 327.12 Idio hypersom-no lng slp
- 327.13 Recurrent hypersomnia
- 327.14 Hypersomnia in other dis
- 327.15 Hypersom dt mental disor
- 327.19 Organic hypersomnia NEC
- 327.20 Organic sleep apnea NOS
- 327.21 Prim central sleep apnea
- 327.22 High altitude breathing
- 327.23 Obstructive sleep apnea
- 327.24 Idiopath sleep hypovent
- 327.25 Cong cntrl hypovent synd
- 327.26 Sleep hypovent oth dis
- 327.27 Cntrl sleep apnea ot dis
- 327.29 Organic sleep apnea NEC
- 327.30 Circadian rhym sleep NOS
- 327.31 Circadian rhy-delay slp
- 327.32 Circadian rhy-advc sleep
- 327.33 Circadian rhym-irreg slp
- 327.34 Circadian rhym-free run
- 327.35 Circadian rhythm-jetlag
- 327.36 Circadian rhy-shift work
- 327.37 Circadian rhym oth dis
- 327.39 Circadian rhym sleep NEC
- 327.40 Organic parasomnia NOS
- 327.41 Confusional arousals
- 327.42 REM sleep behavior dis
- 327.43 Recurrnt sleep paralysis
- 327.44 Parasomnia oth diseases
- 327.49 Organic parasomnia NEC
- 327.51 Periodic limb movement
- 327.52 Sleep related leg cramps
- 327.53 Sleep related bruxism
- 327.59 Organic sleep movemt NEC
- 327.8 Sleep organic disord NEC
Questions About This Page
Are the 327.00-327.8 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 327.00-327.8 block classify?
The block classified 327 organic sleep disorders with 40 codes in the final ICD-9-CM release. It sat under Diseases of the nervous system (320–359) 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.
