Important portions of major systems (such and plumbing, electrical, and foundation slab elements) are hidden within the walls or slab, thus cannot be inspected without using destructive methods. Also, the version of "code" being followed by city building inspectors varies from city to city. Keeping track of these differences, which change from year to year, is something that home inspectors (especially those who in large urban areas) cannot be reasonably expected to do, as researching and studying these changes would leave little or no time to actually perform inspections. Finally, an exhaustive analysis of every system in the home that would ensure compliance with all applicable code would require days rather than hours to complete, driving the cost of the inspection up commensurately.
This is why the majority of home inspectors don't refer to "code" when preparing their reports. We are far more concerned about factors that affect your safety and the overall soundness and functionality of your home, and many of these concerns are not addressed in building codes. Terms like "common or best practices" or "accepted safety standards" or more likely to be used when addressing deficiencies found in the home.
If your home was built in an incorporated area, it has already been inspected to assure compliance with applicable building codes by city inspectors, and the outcome of those inspections is on record with the city. You may wish to contact them if you wish to assure yourself that your home has passed the necessary inspections.
So, best not to get fixated on "code". It changes, and does not necessarily address the things that truly matter regarding the condition of a home.