Background: Long Covid (LC) is a multisystem condition leading to a wide range of symptoms and often requiring treatment by several different clinical specialties. Patients with LC have reported difficulties in accessing care and a lack of coordination of their care, particularly in a hospital setting. Objective: To determine the extent to which the intensity and continuity of hospital care changes for patients after they receive an LC diagnosis. Design: Retrospective observational cohort study using a linked primary and secondary care dataset. Setting and Participants: Routine healthcare data from North West London Integrated Care System of patients with a recorded diagnosis of LC who had attended a secondary care hospital Trust from 1 January 2019 to 30 September 2023. Main Variables Studied: The intensity of utilisation of secondary care was calculated, and the continuity of care with respect to hospitals and specialties was computed using the sequential continuity score (SeCon) before the Covid-19 pandemic, before and after an LC diagnosis. Results: 5611 out of 6270 (90.1%) patients diagnosed with LC had a recorded secondary care interaction in the study period. Intensity of secondary care utilisation increased markedly in outpatient, inpatient and Emergency Department pathways after a diagnosis of LC but peaked in the week of diagnosis. Average hospital SeCon fell significantly after an LC diagnosis from 1.00 to 0.83, while specialty SeCon remained unchanged from after diagnosis (0.40) and before the pandemic (0.44). A notable shift in specialty activity was observed with a focus on respiratory medicine as a major hub in a densely connected patient-sharing network with cardiology and other medical and surgical specialties. Discussion: A recorded LC diagnosis was associated with increases in the intensity of hospital activity and a reduction in hospital-level care continuity, but no change in specialty continuity, which remains low. Conclusion: Collectively, this indicates a significant need to support LC patients as they navigate fragmented secondary care pathways. Patient and Public Contribution: This study was co-designed with, conducted with and written in conjunction with people with long Covid.