This code system https://fhir.nhs.uk/CodeSystem/Ambulance-MentalHealthLegalClass defines the following codes:
| Code | Display |
| 01 | Informal | |
| 02 | Formally detained under Mental Health Act Section 135 | |
| 03 | Formally detained under Mental Health Act Section 136 | |
| 04 | Formally detained under Mental Health Act Section 2 | |
| 05 | Formally detained under Mental Health Act Section 3 | |
| 06 | Formally detained under Mental Health Act Section 4 | |
| 07 | Formally detained under Mental Health Act Section 5(2) | |
| 08 | Formally detained under Mental Health Act Section 5(4) | |
| 09 | Formally detained under Mental Health Act Section 35 | |
| 10 | Formally detained under Mental Health Act Section 36 | |
| 12 | Formally detained under Mental Health Act Section 37 with section 41 restrictions | |
| 13 | Formally detained under Mental Health Act Section 37 | |
| 14 | Formally detained under Mental Health Act Section 38 | |
| 15 | Formally detained under Mental Health Act Section 44 | |
| 16 | Formally detained under Mental Health Act Section 46 | |
| 17 | Formally detained under Mental Health Act Section 47 with section 49 restrictions | |
| 18 | Formally detained under Mental Health Act Section 47 | |
| 19 | Formally detained under Mental Health Act Section 48 with section 49 restrictions | |
| 20 | Formally detained under Mental Health Act Section 48 | |
| 31 | Formally detained under Criminal Procedure(Insanity) Act 1964 as amended by the Criminal Procedures (Insanity and Unfitness to Plead) Act 1991 | |
| 32 | Formally detained under other acts | |
| 35 | Subject to guardianship under Mental Health Act Section 7 | |
| 36 | Subject to guardianship under Mental Health Act Section 37 | |
| 37 | Formally detained under Mental Health Act Section 45A (Limited direction in force) | |
| 38 | Formally detained under Mental Health Act Section 45A (Limitation direction ended) | |
| 98 | Not Applicable | |
| 99 | Not Known | |
