39.—(1) A claimant has limited capability for work if—
(a)it has been determined that the claimant has limited capability for work on the basis of an assessment under this Part or under Part 4 of the ESA Regulations; or
(b)the claimant is to be treated as having limited capability for work (see paragraph (6)).
(2) An assessment under this Part is an assessment as to the extent to which a claimant who has some specific disease or bodily or mental disablement is capable of performing the activities prescribed in Schedule 6 or is incapable by reason of such disease or bodily or mental disablement of performing those activities.
(3) A claimant has limited capability for work on the basis of an assessment under this Part if, by adding the points listed in column (3) of Schedule 6 against each descriptor listed in column (2) of that Schedule that applies in the claimant’s case, the claimant obtains a total score of at least—
(a)15 points whether singly or by a combination of descriptors specified in Part 1 of that Schedule;
(b)15 points whether singly or by a combination of descriptors specified in Part 2 of that Schedule; or
(c)15 points by a combination of descriptors specified in Parts 1 and 2 of that Schedule.
(4) In assessing the extent of a claimant’s capability to perform any activity listed in Schedule 6, it is a condition that the claimant’s incapability to perform the activity arises—
(a)in respect of any descriptor listed in Part 1 of Schedule 6, from a specific bodily disease or disablement;
(b)in respect of any descriptor listed in Part 2 of Schedule 6, from a specific mental illness or disablement; or
(c)in respect of any descriptor or descriptors listed in—
(i)Part 1 of Schedule 6, as a direct result of treatment provided by a registered medical practitioner for a specific physical disease or disablement, or
(ii)Part 2 of Schedule 6, as a direct result of treatment provided by a registered medical practitioner for a specific mental illness or disablement.
(5) Where more than one descriptor specified for an activity applies to a claimant, only the descriptor with the highest score in respect of each activity which applies is to be counted.
(6) A claimant is to be treated as having limited capability for work if any of the circumstances set out in Schedule 8 applies.