A common theme after transitioning from Read v2 to SNOMED was for Practices to discover that patients had been added to their chronic disease registers. The numbers were not often large, but had the potential to make the patient aware they were now on a disease register.
The reason for these additions was the way in which Read codes had been mapped to SNOMED, and the resulting choice of SNOMED codes for the QOF code clusters.
Patients who had previously been coded with Recurrent wheezy bronchitis [H30] [195949008] were added to the COPD register
Patients who had previously been coded with Post-concussion syndrome [E2A2] [40425004] were added to the Dementia register

Recurrent wheezy bronchitis is the original Read code term, but the preferred term for SNOMED is Chronic asthmatic bronchitis. Both terms share the same SNOMED Concept ID.
NHS Digital subsequently made changes in QOF v41.0 to the DEM_COD codeset for dementia which removed post-concussion syndrome from the inclusion list, but recurrent wheezy bronchitis remains on COPD_COD.
Those patients with Recurrent wheezy bronchitis need clinical review to determine if they have a COPD diagnosis by another qualifying code or by diagnostic measures. Where it has been determined that a patient does not have a COPD diagnosis, all original Recurrent wheezy bronchitis codes need to be removed from the record and replaced with an alternative code which does not cause the patient to be added to a disease register. There is no suggested list of codes, but consider 'Wheezing' or even 'Wheezy bronchitis'; the latter term is used for the asthma register, although only if the patient is also receiving asthma medication.