TL;DR: Aetna, a CVS Health company, modified CPB 0370 governing phototherapy for psychiatric disorders, effective September 26, 2025. Billing teams that submit E0203 or A4634 for light box therapy need to verify their patients meet both mandatory criteria before claims go out.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Aetna, a CVS Health company |
| Policy | Phototherapy for Psychiatric Disorders |
| Policy Code | CPB 0370 Aetna |
| Change Type | Modified |
| Effective Date | September 26, 2025 |
| Impact Level | Medium |
| Specialties Affected | Psychiatry, Behavioral Health, Primary Care, DME Suppliers |
| Key Action | Confirm dual-criteria documentation (bipolar/recurrent MDD diagnosis + DSM-5 seasonal pattern) before billing E0203 or A4634 |
Aetna Light Box Therapy Coverage Criteria and Medical Necessity Requirements 2025
Aetna's phototherapy coverage policy for psychiatric disorders is tighter than most billing teams realize. The payer considers a high-intensity light unit — billed under HCPCS E0203 (therapeutic lightbox, minimum 10,000 lux, tabletop model) — medically necessary durable medical equipment only when a member clears two hard requirements. Both must be met. Neither is optional.
Criterion 1: The member must carry a diagnosis of bipolar disorder or recurrent major depression. ICD-10 codes F30.10–F32.9 cover the bipolar range. Codes F33.0–F33.9 cover recurrent major depressive disorder. Straightforward — but criterion two is where claims fall apart.
Criterion 2: The member must meet DSM-5 criteria for a seasonal mood disorder. That means at least two years of seasonal depressive episodes that fully remit when spring daylight increases, and those seasonal episodes must substantially outnumber any non-seasonal episodes. This isn't a clinical note that says "patient feels worse in winter." Your documentation needs to show a documented multi-year pattern of seasonal onset and spring remission.
These two criteria work as a logical AND, not an OR. A member with bipolar disorder who doesn't have a documented seasonal pattern doesn't qualify. A member with a clear seasonal pattern but only a single-episode depression history doesn't qualify either. Missing either one means the claim is headed for denial.
If you're billing HCPCS A4634 for replacement bulbs on an existing therapeutic lightbox, the same medical necessity gate applies. The equipment and the consumable supplies both require the member to meet the full dual-criteria standard.
The policy does not specifically call out prior authorization requirements in the CPB 0370 summary, but Aetna's DME benefit policies often layer plan-level prior auth requirements on top of CPB criteria. Check the member's specific plan benefits before billing E0203. If you're uncertain, contact Aetna provider services before submitting — not after a denial.
Aetna Phototherapy Exclusions and Non-Covered Indications
The post-stroke depression exclusion is the sharpest edge in this policy. CPT 96900 (actinotherapy/ultraviolet light), HCPCS E0203, and HCPCS A4634 are all explicitly marked not covered for post-stroke depression. ICD-10 F32.89 carries the same exclusion notation.
This matters because post-stroke depression is common, and some providers treat it with light therapy off-label. Aetna's Aetna light box therapy coverage policy draws a hard line here. If F32.89 or a post-stroke depression indicator appears anywhere in the claim or supporting documentation, expect a denial. Screen your ICD-10 selections before submission.
Beyond post-stroke depression, phototherapy billed outside the SAD/seasonal mood disorder criteria — whether for anorexia nervosa (F50.x), non-seasonal sleep disorders (F51.x, G47.x), Parkinson's disease (G20.x, G21.x), postpartum mood disorders (F53.x), or dementia (F02.x, F03.x) — falls into a different coverage category. Those codes appear in the policy's ICD-10 list, but they map to separate coverage determinations under CPB 0370. Don't assume an ICD-10 code appearing in the policy automatically means light box therapy is covered for that diagnosis under the SAD criteria. The SAD medical necessity standard is specific to bipolar disorder and recurrent MDD with a seasonal pattern.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| SAD with bipolar disorder + documented seasonal pattern (2+ years) | Covered | E0203, A4634, F30.10–F32.9 | Both criteria must be met; confirm seasonal remission documentation |
| SAD with recurrent major depression + documented seasonal pattern (2+ years) | Covered | E0203, A4634, F33.0–F33.9 | Same dual-criteria standard applies |
| Actinotherapy (UV light) for covered SAD indications | Covered if criteria met | CPT 96900 | Subject to same selection criteria |
| Replacement bulbs for covered lightbox | Covered if criteria met | A4634 | Member must still meet underlying DME criteria |
| Post-stroke depression (any) | Not Covered | F32.89 | Explicit exclusion for E0203, A4634, CPT 96900 |
| Non-seasonal sleep disorders | Separate coverage determination | F51.x, G47.x | Not covered under SAD light box criteria |
| Parkinson's disease / secondary parkinsonism | Separate coverage determination | G20.x, G21.x | Not covered under SAD light box criteria |
| Dementia | Separate coverage determination | F02.x, F03.x | Not covered under SAD light box criteria |
| Anorexia nervosa | Separate coverage determination | F50.x | Not covered under SAD light box criteria |
| Postpartum mood disorders | Separate coverage determination | F53.x | Not covered under SAD light box criteria |
Aetna Phototherapy Billing Guidelines and Action Items 2025
This policy's dual-criteria structure creates a documentation problem that's easy to miss in a busy practice. Here's how to protect your reimbursement before and after the September 26, 2025 effective date.
| # | Action Item |
|---|---|
| 1 | Audit your active light box therapy claims against the dual-criteria standard now. Pull every open or recent claim with E0203 or A4634 on file. For each one, confirm the chart contains a bipolar or recurrent MDD diagnosis AND documented DSM-5 seasonal pattern with at least two years of seasonal episodes. If the documentation supports only one of the two criteria, hold the claim and request clinical documentation before submitting. |
| 2 | Update your ICD-10 pairing rules for E0203 and A4634. Your charge capture or billing system should flag any submission of E0203 or A4634 that doesn't pair with an F30.10–F32.9 or F33.0–F33.9 code. Build that edit before October 1, 2025. |
| 3 | Remove F32.89 from your accepted diagnosis list for light box therapy. The post-stroke depression exclusion is explicit. If your charge capture allows F32.89 to pair with E0203, A4634, or CPT 96900, close that gap immediately. This is a straightforward claim denial waiting to happen. |
| 4 | Train your clinical documentation team on the seasonal pattern requirement. The DSM-5 seasonal specifier standard — two years of seasonal episodes with full spring remission, outnumbering non-seasonal episodes — needs to appear in the record before the equipment order goes out. A vague note about winter mood changes won't support medical necessity. Work with your behavioral health providers to use structured language that maps directly to DSM-5 criteria. |
| 5 | Verify plan-level prior authorization requirements separately. CPB 0370 sets the medical necessity floor, but individual Aetna plan designs can add prior auth requirements on top of it. Before ordering the lightbox, check the member's specific benefit structure. Pulling a prior auth denial after the device is in the patient's home is a difficult recovery. |
| 6 | Flag any off-label light therapy documentation carefully. If a provider is using light therapy for Parkinson's, sleep disorders, or postpartum depression and wants to bill E0203, that's a different conversation entirely — and likely not covered under this policy. Talk to your compliance officer before submitting those claims. The codes appear in CPB 0370's ICD-10 list, but that doesn't mean the SAD equipment benefit applies. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Phototherapy Under CPB 0370
Covered CPT Codes (When Selection Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| 96900 | CPT | Actinotherapy (ultraviolet light) — not covered for post-stroke depression |
Covered HCPCS Codes (When Selection Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| E0203 | HCPCS | Therapeutic lightbox, minimum 10,000 lux, table top model — not covered for post-stroke depression |
| A4634 | HCPCS | Replacement bulb for therapeutic light box, tabletop model — not covered for post-stroke depression |
Key ICD-10-CM Diagnosis Codes
| Code | Description |
|---|---|
| F02.80–F02.818 | Dementia in other diseases classified elsewhere, with or without behavioral disturbance |
| F03.90–F03.918 | Unspecified dementia |
| F03.90–F03.91 (F05 also required) | Presenile dementia with delusional features |
| F05 | Delirium due to known physiological condition |
| F30.10–F32.9 | Bipolar disorder (seasonal affective disorder) — F32.89 not covered for post-stroke depression |
| F32.0–F33.9 | Major depressive disorder |
| F33.0 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.1 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.2 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.3 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.4 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.5 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.6 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.7 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.8 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F33.9 | Major depressive disorder, recurrent (seasonal affective disorder) |
| F50.0–F50.9 | Anorexia nervosa (multiple subcodes) |
| F51.1–F51.9 | Sleep disorders not due to a substance or known physiological condition |
| F53.0–F53.1 | Mental and behavioral disorders associated with the puerperium |
| G20.A1–G20.C | Parkinson's disease |
| G21.A1–G21.9 | Secondary parkinsonism |
| G47.0–G47.23 | Sleep disorders (including hypersomnia, insomnia, circadian rhythm disorders) |
| G47.14 (G47.30 also required) | Hypersomnia with sleep apnea, unspecified |
The full ICD-10-CM list under CPB 0370 contains 128 codes. The complete list is available at app.payerpolicy.org/p/aetna/0370.
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