CPT's in Occupational Health

Good afternoon,

I work for a Occupational Health physician. Can someone steer me in the right direction to find CPT® codes that are specifically used in the Occupational Health field? We deal with a lot of companies that require their employees to wear respirators. The employee will come into our office and wear the mask and check the fitting, whether they are any leaks and whether they will be able to wear the mask while working. Is there a CPT® or HCPCS to bill for this?

Thank you