Remestemcel-L-rknd (Ryoncil) — CPB 1077 | AETNA Coverage Update

TL;DR: Aetna, a CVS Health company, modified CPB 1077 covering remestemcel-L-rknd (Ryoncil) for steroid-refractory acute graft-versus-host disease, effective September 26, 2025. Precertification is required before you bill CPT 96365 or 96366 for infusion administration — and without it, you're looking at a claim denial.

Aetna's Ryoncil coverage policy under CPB 1077 Aetna system now requires precertification for all participating providers and members in applicable plan designs. This is a high-stakes policy for transplant programs and oncology infusion centers billing remestemcel-L-rknd (Ryoncil) billing. If your team isn't set up for this prior authorization workflow by September 26, 2025, expect denials.

Quick-Reference Table

Aetna Remestemcel-L-rknd Coverage Criteria and Medical Necessity Requirements 2025

The Aetna Ryoncil coverage policy under CPB 1077 ties coverage to one diagnosis: acute graft-versus-host disease (aGVHD) that is steroid-refractory. In ICD-10 terms, that's D89.810. No other indications appear in the covered criteria.

Ryoncil (remestemcel-L-rknd) is a mesenchymal stem cell therapy approved by the FDA for steroid-refractory aGVHD in pediatric patients. Aetna's coverage policy aligns with that approved indication. If a patient doesn't meet the steroid-refractory threshold or the diagnosis codes don't support D89.810, medical necessity won't be established — and your claim won't survive review.

Precertification is mandatory. This isn't optional for some plan designs — Aetna requires it of all participating providers and members in applicable plans. Call (866) 752-7021 to initiate precertification. If your process uses fax, send your Statement of Medical Necessity (SMN) form to (888) 267-3277. You can pull the SMN precertification forms directly from Aetna's specialty pharmacy precertification page.

The prior authorization requirement applies regardless of clinical urgency. Build this into your infusion scheduling workflow now — before September 26, 2025. Transplant programs that administer Ryoncil before getting a precertification number are taking on full financial exposure. Ryoncil carries a list price in the hundreds of thousands of dollars per course. A denied claim without prior auth is not a billing problem you want to chase retroactively.

On the infusion billing side, CPT 96365 covers the initial intravenous infusion hour for therapy or prophylaxis. CPT 96366 covers each additional hour and is billed as an add-on to 96365. These are the infusion administration codes Aetna has linked to this policy. Both codes require the underlying Ryoncil claim to be supported by the precertified authorization and the D89.810 diagnosis.

Premedication is also part of the clinical picture here. Aetna includes a long list of corticosteroid HCPCS codes in this policy — J0702 through J8540 — likely because corticosteroids are used as premedication or concurrent treatment in aGVHD management. Those codes need to be billed correctly alongside the infusion codes. Review your charge capture for all 17 corticosteroid HCPCS codes listed in this policy. Missing or miscoded premedication billing can complicate medical necessity documentation and create audit risk.

Coverage Indications at a Glance

Aetna Ryoncil Billing Guidelines and Action Items 2025

Here's what your billing and clinical operations teams need to do before and after September 26, 2025.

1. Set up precertification as a hard stop in your scheduling workflow — before September 26, 2025.
No Ryoncil infusion should be scheduled without a precertification number in hand. Add a checkpoint in your scheduling and infusion prep workflow that blocks administration until auth is confirmed. The precertification number is (866) 752-7021.

2. Pull and complete the Aetna SMN precertification form before the first dose.
Get the Statement of Medical Necessity form from Aetna's specialty pharmacy precertification forms page. Complete it with the treating physician before the infusion date. Fax to (888) 267-3277 and retain your fax confirmation. Document the submission date in the patient's billing record.

3. Verify ICD-10 code D89.810 is the primary diagnosis on every Ryoncil claim.
D89.810 — Acute graft-versus-host disease, steroid-refractory — is the only ICD-10-CM code linked to this coverage policy. If your coding team is using a parent code like D89.81 (acute GvHD without the steroid-refractory qualifier), you'll fail medical necessity review. The specificity of D89.810 is not optional.

4. Audit your charge capture for CPT 96365 and 96366 infusion administration codes.
CPT 96365 is your primary infusion code for the initial hour. CPT 96366 is the add-on for each additional hour. Make sure your infusion nurses are documenting start and stop times precisely — this documentation drives the number of 96366 units you can bill. Missing time documentation is one of the most common sources of infusion billing under-capture and audit findings.

5. Review corticosteroid HCPCS code billing against the 17 codes in this policy.
Aetna lists J0702, J1020, J1030, J1040, J1094, J1100, J1700, J1710, J1720, J2650, J2920, J2930, J7506, J7509, J7510, J7512, and J8540 as corticosteroid codes related to this CPB. Cross-reference your charge description master (CDM) to confirm the right HCPCS code maps to each corticosteroid formulation and dosage you're actually administering. Methylprednisolone alone has five different HCPCS codes in this list — J1020, J1030, J1040, J2920, and J2930 — differentiated by formulation and dose.

6. Loop in your compliance officer if you have any question about off-label use or non-pediatric patients.
FDA approval for Ryoncil is specifically for pediatric patients with steroid-refractory aGVHD. If your transplant program is considering this therapy for adult patients or for GvHD indications beyond steroid-refractory aGVHD, the coverage policy does not support reimbursement under CPB 1077 for those cases. Talk to your compliance officer before billing Aetna for off-label use.

CPT, HCPCS, and ICD-10 Codes for Remestemcel-L-rknd (Ryoncil) Under CPB 1077

Infusion Administration CPT Codes

Corticosteroid HCPCS Codes (Related to CPB 1077)

These corticosteroid codes appear in CPB 1077 and are relevant to premedication and concurrent GvHD management billing. Confirm documentation supports each code billed.

Key ICD-10-CM Diagnosis Code

A Note on Corticosteroid Code Specificity

The five methylprednisolone codes in this policy deserve a closer look. They're not interchangeable. J1020, J1030, and J1040 are methylprednisolone acetate in three different doses (20, 40, and 80 mg). J2920 and J2930 are methylprednisolone sodium succinate — a different formulation — at up to 40 mg and up to 125 mg respectively. J7509 is oral methylprednisolone per 4 mg tablet.

Billing the wrong code — even by swapping acetate for succinate — creates a medical necessity mismatch between the claim and the clinical record. Audit your CDM now. If your pharmacy system auto-populates HCPCS codes, verify the mapping is formulation-specific, not just drug-name-specific.

The same logic applies to dexamethasone. J1094 is dexamethasone acetate injection, J1100 is dexamethasone sodium phosphate injection, and J8540 is oral dexamethasone at 0.25 mg per unit. Three codes, three distinct products. Your clinical documentation has to match.

What the Billing Guidelines Don't Tell You — But Should

The CPB 1077 Aetna system policy is straightforward in structure, but it leaves a few practical questions unanswered.

The policy doesn't specify quantity limits for Ryoncil courses or infusion frequency. That means your team will need to track authorization approvals carefully and document each course separately. Don't assume one auth covers an entire treatment course — confirm scope with Aetna during the precertification call.

The policy also doesn't address site-of-service. Ryoncil infusions in the hospital outpatient setting versus a freestanding infusion center can carry different reimbursement rates and different claim requirements. Confirm which facility type your Aetna contract covers for this service before the first claim goes out.

If your team is new to Ryoncil billing, talk to your compliance officer before the effective date of September 26, 2025. This is a specialty drug with significant per-claim dollar value. Getting the precertification, diagnosis coding, and infusion administration billing right the first time is far cheaper than working a denial.