Short answer. Only some. Every sickness, injury or death must be entered in the company logbook, but the Labor Code requires the employer to report to the System only those contingencies he deems to be work-connected. Recording is universal; reporting onward is filtered by the employer's assessment.
What the law says
Within five days after entry in the logbook, the employer shall report to the System only those contingencies he deems to be work-connected.
Labor Code, Article 205 — Employer’s Logbook. Read the full provision →
Two duties with two different scopes
The article opens by requiring all employers to keep a logbook recording the sickness, injury or death of their employees, chronologically, with names, dates and places, the nature of the contingency, and absences. That duty is unqualified — every contingency goes in, work-connected or not, with entries made within five days from notice or knowledge. Reporting to the System is the narrower, second step, and it is triggered only for the subset the employer considers work-connected.
Why the employer's view is not the last word
The filter is phrased as what the employer deems to be work-connected, which sounds like it hands him the decision. It does not decide your entitlement. His assessment governs what he is obliged to forward; whether a contingency is compensable is determined in the claim itself. So an employer who concluded your injury was not work-related has expressed an opinion about his reporting duty, and you are not shut out of pursuing the claim because he formed that view.
The logbook entry still has to exist
This distinction matters when an employer says nothing was reported because he did not think the injury was work-connected. That may answer the reporting duty while leaving the recording duty unmet — and failing to record an actual sickness, injury or death within the prescribed period, giving false information, or withholding material information already in his possession carries its own liability under the same article. So the first question to ask is not whether it was reported but whether it was written down at all.
How to check
The article lets the System require the employer to furnish a certificate about any contingency appearing in the logbook, citing the entry number, page number and date, and it makes the logbook available for inspection by the System's duly authorised representative. So the record is not beyond reach. In the meantime, keep your own dated account, the medical documents, and any message in which you told a supervisor what happened, and take advice before accepting that a claim cannot proceed. Keep your own copy of whatever was filed, with the date. If a claim is later questioned on the ground that nothing was reported at the time, the contemporaneous record is what answers it, and it is far easier to obtain while you are still employed than afterwards.