Yes. In addition to and separate from the limitation on post-retirement Massachusetts public sector earnings, the post-retirement earnings of disability retirees are limited. A disability retiree can be employed in the private sector after retirement. The amount of earned income when added to the disability retirement allowance cannot exceed the regular compensation that would have been payable to the retiree had he or she remained in service in the grade held at the time of retirement, plus $15,000. If this earnings limitation is exceeded, the retiree’s allowance will be withheld until the overpayment is recovered by the Retirement Board. Hours are limited to 960 hours per calendar year, if employed by a Massachusetts public sector employer.
Please see the below link to PERAC's 'Working & Receiving a Public Retirement Benefit' Webpage for additional information: