Texas DWC064: Medical Interlocutory Order Request

When a Texas workers' compensation carrier denies preauthorization for a drug the injured employee was already taking that is excluded from DWC's closed formulary, the prescribing doctor or pharmacy can ask DWC for a medical interlocutory order (MIO). The order lets the drug continue while the independent review of the denial is pending. DWC approves or denies the request on the form itself.

Who completes it

The prescribing doctor or the pharmacy completes the request and signs the certification in Section V. A prescribing doctor must give at least the doctor's name, the employee's name and date of birth and the drug information; other boxes are filled if known.

Submitting and payment

How to submit it
Fax the request to TDI-DWC and, on the same date, send copies to the carrier, prescribing doctor, injured employee and dispensing pharmacy if known.
Who pays
Drugs dispensed under an approved MIO are payable by the insurance carrier under DWC rules, and the form sets no filing fee.

Good to know

  • File within 15 days of an initial preauthorization denial, or within 5 working days of a reconsideration denial.
  • The requester certifies that independent review was requested under 28 TAC 133.308 and that the denial poses an unreasonable risk of a medical emergency under 28 TAC 134.500(7).
  • The drug name, dosage and duration must be identical to the prescription that was denied preauthorization.
  • An approved MIO is effective back to the date DWC received the complete request and lasts until the dispute is finally decided, the appeal period ends or the parties agree.

Get the official form

Download the current version from the source each time; forms change without notice.

Medical Interlocutory Order Request - Continued Use of a Drug Previously Prescribed and Dispensed and Excluded from TDI-DWC's Closed Formulary

How this list is checked

A form is listed only after its name and number were confirmed on the issuing agency’s or insurer’s own website, or in the form itself. Each entry links to that source. The list was last checked in October 2026. Forms and their requirements change without notice, so check the official page for the current version before you complete one.

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Frequently asked questions

Do I have to use DWC Form-064 to request an MIO?

No. The form's FAQ says DWC accepts written requests that contain all the elements required by 28 TAC 134.550(c). The form is the simplest way to include them, since its sections track those requirements, including the requester's certification and the carrier notification.

What should happen in a life-threatening situation while an MIO is pending?

The form reminds requesters that in a life-threatening emergency, the injured employee should be advised to go to the emergency room. The MIO process is for continuing a previously prescribed drug while a preauthorization dispute is reviewed, not for emergency care.