Aetna · Spinraza · US health-plan appeal rights

Spinraza denied for missing prior authorization by Aetna?

Q: How long do I have to appeal a Aetna Spinraza denial?

Internal appeal window: Typically 180 days from the denial date. External review window: Typically 60–120 days after the final internal denial. The clock starts from the date on the denial letter.

If the original prescription wasn't run through prior auth, the path is to submit a PA now with a medical-necessity letter — many plans then back-date approval to the date of service.

By Michael John Ryan, Founder & Privacy Officer, DenialHelp, LLC

Last reviewed 2026-05-09

Policy data current as of 2026-04-26

US health-plan appeal rights

Cite: Most US health plans have appeal rights under either the ACA, ERISA, or Medicare/Medicaid rules

Most US health plans are required by federal law to give you both an internal appeal (where the insurer reconsiders) and an external review (where an independent reviewer decides). The exact timelines and processes depend on what kind of plan you have — marketplace / employer group, self-funded, Medicare Advantage, or Medicaid MCO — but in every case there's a window after the denial during which you have the right to fight it.

Internal appeal window

Typically 180 days from the denial date

External review window

Typically 60–120 days after the final internal denial

What Aetna typically requires

Genetically confirmed SMA (5q biallelic SMN1). Any SMA type, ages 0-99. Loading 12 mg IT days 0/14/28/63 then maintenance q4 mo. Reauth at 14 mo with motor function (CHOP-INTEND for infants, HFMSE for sitters/standers, RULM for non-ambulatory >=2 yr) showing stability or improvement. Not concurrent with Evrysdi or within 6 mo of Zolgensma without medical justification.

Source policy: Aetna CPB 0915 Nusinersen (Spinraza) for SMA

What works in the appeal

CHERISH NEJM 2018 (Mercuri) explicitly enrolled later-onset Type 2/3 ages 2-12 yr — HFMSE +4.0 vs -1.9 sham. SHINE long-term extension confirms sustained benefit. Adult Type 3: Hagenacker Lancet Neurol 2020 real-world adult Spinraza shows HFMSE/RULM stabilization + selected gains; SoC 2018 imposes NO age cap above label. Step-therapy ignores mechanistic differences — IT ASO vs oral SMN2 splicer; scoliosis fusion or IT-access concerns may favor or exclude Spinraza. Post-Zolgensma add-on supported by RESTORE registry + case series + Mercuri 2024 consensus.

Next steps

Find the date on the denial letter — your appeal window starts there.
Read your plan's Summary of Benefits and Coverage (SBC) for the specific deadlines.
Request the insurer's claim file in writing — they must provide it.
Submit your appeal in writing with new clinical evidence and a physician statement.

Get the letter drafted

DenialHelp drafts your appeal in 5 minutes — $40 list price, $30 for your first letter (use code SEO25). We cite the federal regs and the specific clinical evidence your plan responds to. Your physician signs and sends.

Start my appeal — $30 with code SEO25 →

Related appeal guides

Other Aetna appeals

Other denial reasons for Aetna Spinraza

denied as not medically necessary denied for failing step therapy denied as non-formulary denied as experimental or investigational denied as not FDA-approved for this use

This guide describes general US federal appeal rights based on Most US health plans have appeal rights under either the ACA, ERISA, or Medicare/Medicaid rules. Your specific plan documents (Summary of Benefits and Coverage, Evidence of Coverage) override anything here. DenialHelp is not your lawyer and not your physician — we draft appeal letters that your physician signs. Outcomes depend on your insurer's decision and factors outside our control. Reviewed by Michael John Ryan on 2026-05-09. Editorial standards: denialhelp.com/authors.