20 Miss. Code R. § 2-X
Chiropractic manipulative treatments are allowed for up to fifteen (15) visits or thirty (30) days, whichever first occurs, without any need to seek pre-certification or authorization. However, chiropractic manipulative treatments which are proposed beyond the first fifteen (15) visits or thirty (30) days, under any circumstance, must be pre-certified or pre-approved.
Like any other service, a spinal manipulation includes pre-evaluation and post-evaluation that would make it inappropriate to bill with an E/M service. However, if the patient's condition has deteriorated or an injury to another site has occurred, reimbursement can be made for an E/M service if documentation substantiates the separate additional service. Modifier 25 is added to an E/M service when a significant, separately identifiable E/M service is provided and documented as medically necessary.
20 Miss. Code. R. § 2-X