The Ministry of Health has given orders to the various health clinics (HMOs) to remove any signs instructing patients or visitors to dress in a certain way, specifically tzniyus signs in Haredi areas.

According to the MoH, the kupot are not allowed to hang such signs, nor can they verbally instruct people, patients or employees, to dress modestly...

The new instructions come after a complaint was filed about Laniado Hospital, in Tzfat founded by the Tsanzer Hassidim. Upon investigation it was found that it is a fairly common phenomenon in Haredi areas.
source: Kikar

MK Yaakov Litzman has criticized the decision calling it secular coercion. Litzman says it is a legitimate request to be sensitive and considerate of the local population in these places.
source:INN

I am not sure it qualifies as secular coercion. It would be secular coercion if they instead instructed the kupot to install signs saying one must not dress modestly, or saying employees and patients must not cover their hair, or all elbows must be exposed on these premises..

I don't think having no sign at all is secular coercion.

I dont know what these signs accomplish anyway. A patient coming in for treatment who must go to a clinic in a haredi neighborhood (for example, because that's where a specific specialist sees patients, or thats the earliest appointment available with a certain doctor, etc) is not going to show up in the clinic, see the sign and go home and change her clothes. People generally tend to ignore the signs, though they do make some people feel unwelcome or uncomfortable.