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All PT/OT services must have a written order, referral, or prescription by any of the following:
Ordering, prescribing, and referring (OPR) National Provider Identification (NPI) numbers be on the claim form:
Outpatient PT/OT ordered in conjunction with an approved IFSP for Early Intervention may not necessarily have an ordering provider. Under this circumstance alone the rendering provider must use their own NPI number as the OPR NPI number.
Colorado Department of Health Care Policy & Financing
Physical and Occupational Therapy Billing Manual