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Access to comprehensive, relationship-based, longitudinal primary health is recognised as a key factor in high-performing healthcare systems, yet marginalised individuals rarely have access to these services. This paper provides a detailed description of a mobile primary healthcare service in Canberra, ACT, that focuses on caring for people with current or past alcohol and drug dependency, mental health, and other complex health and social needs. The funding structure, clinical governance, and infrastructure are outlined as an exemplar model for a sustainable, high-quality primary healthcare service for people experiencing marginalisation. This innovative hub and spoke model is an example of how comprehensive primary health care can be provided to those most in need so that they can also benefit from longitudinal, relationship-based health and social care.<\/jats:p>","DOI":"10.1071\/py25260","type":"journal-article","created":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T04:32:08Z","timestamp":1777350728000},"source":"Crossref","is-referenced-by-count":0,"title":["Chat to PAT \u2013 an outreach service providing comprehensive primary health care to marginalised people"],"prefix":"10.1071","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-7492-7560","authenticated-orcid":true,"given":"Benjamin","family":"Harkness","sequence":"first","affiliation":[{"name":"ADirections Health Services, Canberra, ACT, Australia."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christopher","family":"Ayres","sequence":"additional","affiliation":[{"name":"ADirections Health Services, Canberra, ACT, Australia."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8712-3390","authenticated-orcid":true,"given":"Anna","family":"Olsen","sequence":"additional","affiliation":[{"name":"BSchool of Medicine & Psychology, College of Science & Medicine, The Australian National University, Canberra, ACT, Australia."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stephanie","family":"Stephens","sequence":"additional","affiliation":[{"name":"ADirections Health Services, Canberra, ACT, Australia."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bronwyn","family":"Hendry","sequence":"additional","affiliation":[{"name":"ADirections Health Services, Canberra, ACT, Australia."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth","family":"Sturgiss","sequence":"additional","affiliation":[{"name":"CFaculty of Health Sciences and Medicine, Bond University, Robina, Qld, Australia."},{"name":"DSchool of Primary and Allied Health Care, Monash University, Frankston, Vic 3199, Australia."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"67","published-online":{"date-parts":[[2026,4,28]]},"reference":[{"key":"2026042800314820100_R1","doi-asserted-by":"publisher","DOI":"10.1016\/j.lanprc.2025.100027","article-title":"Models of global primary care post-2030.","volume":"1(3)","author":"Allen","year":"2025","journal-title":"The Lancet Primary Care"},{"key":"2026042800314820100_R2","unstructured":"Australian Institute of Health and Welfare (2025) Specialist Homelessness Services: feature analysis. 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