In Riverside Sheriffs' Assn. v. County of Riverside, 193 Cal. App. 4th 20 (Cal. App. 4th Dist. 2011), the California 4th District Court of Appeal wrote: "the disability retirement laws 'are intended to alleviate the harshness that would accompany the termination of an employee who has become medically unable to perform his duties. (§ 20001).'"[citation omitted].
The indication of the court is that a public employer must bend over backwards to provide benefits to an employee who is medically disabled from performing his or her job. Thus, it appears that you have a viable case for the recovery of disability pay from the first date of your disability.
For a civil litigation attorney with CalPERS experience referral, see this link
Hope this helps.
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