Does G44.321 require prior authorization?

No, G44.321 does not require prior authorization (high confidence). Covered without prior authorization.

`G44.321`, Chronic post-traumatic headache, intractable

ICD-10-CM

No Prior Auth Required

Covered without prior authorization (high confidence)

To bill for these (denied) procedures, providers must report CPT code 64999 for both trial and permanent electrode-array insertions and indicate whether the procedure is a trial or permanent in the claim narrative/comment field adjacent to CPT 64999.
For Part B claims enter 1 unit of service (UOS) and include the text 'Peripheral Nerve Field Stimulation', 'PNFS', 'Peripheral Subcutaneous Field Stimulation', or 'PSFS' adjacent to CPT 64999 and whether the procedure is permanent or trial in the comment/narrative field (e.g., Loop 2400 or SV101-7 for 5010A1 837P; Item 19 for paper claims).
For Part A claims enter 1 UOS and include the text 'Peripheral Nerve Field Stimulation', 'PNFS', 'Peripheral Subcutaneous Field Stimulation', or 'PSFS' adjacent to CPT 64999 and whether the procedure is permanent or trial in the comment/narrative field (e.g., Line SV02-7 for 837I electronic claims; Block 80 on the UB-04 form).

Malpositioning of the upper eyelid, including dermatochalasia, blepharochalasia, blepharoptosis, brow ptosis, or eyelid injury.
Glaucoma or glaucoma suspect status requiring evaluation or monitoring.
Diabetic retinopathy and/or hypertensive retinopathy.
Macular pathology, including macular degeneration.
Functional assessment of the optic nerve for conditions such as papilledema, coloboma, drusen, optic nerve pallor, pseudopapilledema, Foster–Kennedy syndrome, optic nerve sheath hemorrhage, or optic nerve hypoplasia.
Intracranial hemorrhage, intracranial mass, or clinical concern for increased intracranial pressure.

AMBETTER-CP.VP.63, Visual Field Testing

A55530, Billing and Coding: Peripheral Nerve Stimulation

A56612, Billing and Coding: CT of the Head

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