The fire shut the hospital's seven theatres and the maternity ward for one month. Three theatres have reopened, with another expected to open in April.

A senior director of communications at ACT Health admitted there was "a lot that could have been done better" when communicating publicly about the fire, internal emails released under freedom of information laws show.

Emails revealed that an ACT Health senior director wanted communications to be assessed in any reviews or debriefs of the fire.

"I think there's a lot that could have been done better (both by Calvary and us)," they said.

When asked to expand, an ACT Health spokesman said:

"ACT Health believes it would be beneficial for both organisations (ACTHD and Calvary) to look back at the emergency response and see what communications processes worked well and what could be improved for future responses."

A fire broke out in operating theatre six in the Xavier building at Calvary Public shortly after 12.30pm on December 6.

One staff member was setting up the theatre, and a patient was being operated on in a nearby theatre. The hospital was partially evacuated, with about 30 patients affected.

On the day, the Emergency Services Agency said it believed the fire started in a roof cavity.

Health Minister Rachel Stephen-Smith was told two days later in a ministerial briefing that a piece of equipment had caught fire.

A ministerial briefing to Chris Steel from December 16, who was then acting health minister, revealed that Fire and Rescue believed a surgical boom had caught fire, but investigations were ongoing.

In January, Calvary regional chief executive Ross Hawkins told ABC radio: "the information that we have at the moment from Fire and Rescue was that it was an electrical fault in a piece of equipment."

A Calvary spokeswoman said on Monday that the cause of the fire was still unknown, but it was "located within a boom".

"Calvary Public Hospital Bruce concurs that ACT Fire [and] Rescue confirmed the theatre fire ... was located within a boom, within the theatre. However, the actual cause of the fire remains subject to ongoing investigations," she said.

A surgical boom is a piece of equipment designed to keep cords centralised. It may have electric and gas outlets.

Calvary executive Mr Hawkins called comments made by ACT Health and Ms Stephen-Smith in an ABC news report "problematic", emails to ACT Health reveal.

"There are a couple of comments in this article which are problematic (one from the directorate and one from the minister)," he said.

"It would be good to discuss our approach to media regarding the fire."

In the online article from December 9, three days after the fire, Ms Stephen-Smith said the operating theatres would be unusable for "quite some time".

"There is absolutely no way Calvary will be able to meet its elective surgery target this year," she said.

ACT Health was quoted once in the story, saying that arrangements were in place to allow staff from Calvary Public Hospital to help by working at different hospitals while maternity services were on bypass.

A Calvary spokesperson did not answer a question about what Mr Hawkins found problematic about the comments.

The Canberra Times also understands some health officials were initially reluctant to admit a fire had broke out, with a draft media document from the day calling it an "incident". However, all published communications did state there had been a fire.

In what was described as a "surgeons' letter" - a draft document from December 21 addressed as "Dear Dr" - doctors were implored to help ease pressure on the public system.

The letter was "appealing to our surgical community" to ensure urgent patients were operated on, and compared the impact of the fire to the COVID-19 shutdown in 2020.

It asked surgeons to prioritise urgent patients, consider declining referrals from outside the ACT catchment area and avoid accepting non-critical patients from outside the ACT.

"Consider diverting Medicare ineligible patients not requiring tertiary level care across to the private hospital system, and [adding] public patients to your private lists," the letter said.

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"The flow-on and challenges that we are facing are not dissimilar to those of the COVID shutdown in 2020, which you responded to with compassion and commitment."

The letter said many urgent elective surgery patients would not be treated within the recommended timeframe of 30 days.

"There are approximately 250 Category 1 elective surgery public patients listed at Calvary and it appears that a number of these patients will not be able to have their surgery within the recommended timeframe before the end of the year," it said.

"There is also a significant number of Category 2 patients who will also potentially face delays. As you can appreciate, this effect is likely to flow-on to the ACT waitlist."

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