Before I answer this question is important to note that besides the 2016 version of ISO 13485, all ISO management systems published after 2012 have the same general structure.
Considering that, integrating ISO 27001 with ISO 13485 is possible, but requires a bit more effort than required regarding integration with other management systems, like ISO 9001, and ISO 14001. First, you have to map the relations between ISO 13485:2016 clauses and ISO 9001:2015 clauses (you can do that consulting ISO 13485 Annex B). After that, you can make the link with ISO 27001 clauses.
For example, ISO 13485:2016 clause 4.2 (Documentation requirements) corresponds to ISO 9001:2015 clause 7.5 (Documented information), which is the same clause for ISO 27001.
After this mapping the integration process should consider two phases:
1 – Integration of the common requirements of ISO 13485 and ISO 27001 management systems, e.g., control of documents, internal audit, management review, etc. These will require lesser adjustments to refer to systems covered
2 – Integration of the specific parts of each system. Regarding ISO 27001, this means including in the organizational process the activities related to information security risk assessment and treatment processes.
Regarding the audit of integrated standards, you just need to plan the audit considering a single approach to common requirements and approaches specifics for the core of each one (e.g., a single checklist for common requirements and checklists specific for the main part of each standard).
These articles will provide you a further explanation about integrating ISO management systems and defining audit checklists:
- How to implement integrated management systems https://advisera.com/log/2015/10/05/how-to-implement-integrated-management-systems/
- Using ISO 9001 for implementing ISO 27001 https://advisera.com/27001academy/blog/2010/03/08/using-iso-9001-for-implementing-iso-27001/
- How to make an Internal Audit checklist for ISO 27001 / ISO 22301 https://advisera.com/27001academy/knowledgebase/how-to-make-an-internal-audit-checklist-for-iso-27001-iso-22301/