Millstone Medical Outsourcing is expanding again, this time at its Memphis operation.

The Fall River-based inspection and clean room services provider is adding 12,000 square feet to its facility in the Bluff City, taking its total to 43,600 square feet and increasing its inspection, storage and distribution capacities.

It’s the second expansion this year for Millstone, which opened a second location in its Fall River home base in February.