Circadian rhythm disorder codes
Metadata
- Coding system
- SNOMED CT (UK Clinical Edition)
- Coding system release
- 42.2.0
- Latest compatible release
- 42.4.0 (2026-08-05)
- Organisation
- NHSD Primary Care Domain Refsets
- Codelist ID
- nhsd-primary-care-domain-refsets/crd_cod
- Version Tag
- 20260630
- Version ID
- 1e06c048
- Number of codes included
- 15
About
Description
Taken from the `CRD_COD` refset published by NHSD. Contains public sector information licensed under the UK Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).
Codelists are developed by a broad community of users for individual study purposes, which may or may not meet the needs of other studies. They should not be thought of as universal definitions of a particular condition.
We don't offer any guarantees about what they do or don't identify. Users should carefully check that any codelist meets their needs, and seek clinical input where appropriate.
| code | term |
|---|---|
| 1142084009 | Hypernychthemeral syndrome |
| 1300131002 | Neurexin 1-related severe neurodevelopmental disorder, motor stereotypies, chronic constipation, sleep-wake cycle disturbance |
| 15976004 | Abnormal circadian rhythm |
| 192004002 | Repeated rapid eye movement sleep interruptions |
| 192008004 | Reversed sleep-wake cycle |
| 230495008 | Transient sleep-wake rhythm disorder |
| 230496009 | Non-24 hour sleep-wake cycle |
| 271793004 | Irregular sleep-wake pattern |
| 271794005 | Disorder of sleep-wake cycle |
| 31491000119109 | Disruptions of 24 hour sleep-wake cycle |
| 31537005 | Sleep-wake schedule disorder, advanced phase type |
| 54532007 | Sleep-wake schedule disorder, frequently changing type |
| 715829003 | Familial advanced sleep phase syndrome |
| 80623000 | Sleep-wake schedule disorder, delayed phase type |
| 99711000119104 | Organic sleep-wake cycle disorder |