Very good question!
Numerous sources will helpfully tell you to use Business Industry Code 812199 - Other Personal Care Services.
Don't do it!
This is actually the NAICS Business Industry Code for MASSAGE PARLORS, and will hurt your Massage Therapy business in the long run.
For Massage Therapy/Massage Therapists use NAICS Business Industry Code 621399 instead (Other Miscellaneous Health Practitioners).
621399
