Does T84.420S require prior authorization?

No, T84.420S does not require prior authorization (high confidence). Covered without prior authorization.

`T84.420S`, Displacement of muscle and tendon graft, sequela

ICD-10-CM

No Prior Auth Required

Covered without prior authorization (high confidence)

For knee orthoses with adjustable knee joints or prefabricated Swedish type (HCPCS L1832, L1833, L1850) the medical record must document a physical examination of the affected knee(s) including the joint laxity test(s) performed and a description of exam findings that support objective joint laxity.
For single or double upright, adjustable flexion/extension knee orthoses with medial-lateral and rotation control (HCPCS L1843, L1844, L1845, L1846, L1851, L1852) used for ambulatory beneficiaries with knee instability, medical records must document ambulatory status and a physical exam of the affected knee(s) including joint laxity test(s) performed and description of findings supporting objective joint laxity.
For the same single/double upright orthoses (L1843, L1844, L1845, L1846, L1851, L1852) when used to manage pain affecting mobility/function due to medial or lateral tibiofemoral osteoarthritis, records must include ambulatory status; pain symptoms or mobility/functional reduction; physical exam of the affected knee(s); an imaging report describing arthritic changes consistent with medial/lateral tibiofemoral osteoarthritis; and the beneficiary's willingness to use the orthosis.

A knee orthosis is covered when it is a rigid or semi-rigid device used to support a weak or deformed knee or to restrict or eliminate motion in a diseased or injured knee and the device meets the reasonable and necessary requirements of the related Local Coverage Determination and all statutory/regulatory requirements.
Both off-the-shelf (OTS) and custom-fit knee orthoses are treated as prefabricated braces for coding and may be covered provided the coding accurately reflects whether only minimal self-adjustment was required at final fitting per 42 CFR §414.402.
If the orthosis is provided prior to an inpatient hospital admission or Part A SNF stay and the medical necessity begins during that inpatient stay, payment is included in the hospital or SNF payment (do not submit claim to the DME MAC).
An orthosis provided within two days prior to discharge and not needed for inpatient treatment but intended for home use is eligible for DME MAC coverage if medically necessary after discharge.
Occupational therapy is covered for patients with migraine (G43.xx) who require training to reduce pain during basic and instrumental activities of daily living, typically completed in 3–4 sessions.
Electrical stimulation (attended CPT 97032 or unattended HCPCS G0283) may be covered as part of a therapy plan of care to improve function when the nerve supply to the muscle is intact and atrophy is due to non-neurological disuse (e.g., post-casting, splinting, soft-tissue scarring).

A52465, Knee Orthoses - Policy Article

A53057, Billing and Coding: Home Health Occupational Therapy

A53058, Billing and Coding: Home Health Physical Therapy

A53064, Billing and Coding: Outpatient Occupational Therapy

A53065, Billing and Coding: Outpatient Physical Therapy

Ask Backwork about documentation requirements, denial risks, or coverage in your state.