Phonophoresis — CPB 0210 | AETNA Coverage Update

Aetna modified CPB 0210 for phonophoresis, effective September 26, 2025. Here's what billing teams need to know before claims start hitting the new policy.

Aetna, a CVS Health company, updated Clinical Policy Bulletin 0210, which governs the Aetna phonophoresis coverage policy for CPT 97035. This is the code your physical therapy and rehabilitation billing teams use for ultrasound application — specifically when the ultrasound is used to drive a topical medication through the skin. The modification went live September 26, 2025, and if you bill CPT 97035 to Aetna, you need to audit your documentation and charge capture now.

Quick-Reference Table

Aetna Phonophoresis Coverage Criteria and Medical Necessity Requirements 2025

The CPB 0210 Aetna system has governed phonophoresis billing for years, but this September 2025 modification is a signal to recheck your criteria. Phonophoresis — billed under CPT 97035 — is a physical therapy modality that uses therapeutic ultrasound to push medications like corticosteroids or anti-inflammatories into tissue transdermally. Aetna's coverage policy hinges on medical necessity, and the documentation bar is higher than many billing teams treat it.

Medical necessity for CPT 97035 phonophoresis requires that the treating clinician justify why this modality — specifically — is the appropriate intervention for the patient's condition. Generic ultrasound documentation won't cut it here. The note must reflect both the ultrasound application and the medication being driven into the tissue, with clinical rationale for the combined approach.

The ICD-10 code list attached to this policy is long — 297 diagnosis codes in total. That breadth tells you something useful: Aetna recognizes phonophoresis across a wide range of musculoskeletal, wound care, neurological, and other conditions. But coverage across those diagnoses doesn't mean blanket approval. Each claim still needs to show that the specific patient's condition meets medical necessity criteria for phonophoresis specifically, not just for physical therapy in general.

Prior authorization requirements for phonophoresis vary by plan under Aetna. Check your patient's specific plan benefits before the first treatment, especially for longer courses of care. If you're billing multiple units of CPT 97035 per session or across many visits, expect more scrutiny. Talk to your compliance officer if you're unsure how prior auth applies to your Aetna plan mix — this is where claim denial risk concentrates.

Reimbursement for CPT 97035 is billed in 15-minute increments. Document the exact time spent on the modality. Aetna auditors look at time documentation closely when multiple modalities appear on the same claim.

Aetna Phonophoresis Exclusions and Non-Covered Indications

The coverage policy data for CPB 0210 does not enumerate specific exclusion language in the summary provided here. That said, standard Aetna patterns apply: phonophoresis billed without a covered diagnosis, without adequate medical necessity documentation, or for conditions where evidence doesn't support the modality will trigger denial.

The real issue here is clinical documentation that treats CPT 97035 as interchangeable with standard therapeutic ultrasound (which it isn't — phonophoresis requires a pharmacological agent). If your therapists are documenting ultrasound without naming the medication used and the purpose of transdermal delivery, you're creating claim denial exposure under this updated policy. Fix that documentation template now, before September 26, 2025 claims go out.

Coverage Indications at a Glance

The diagnosis code list attached to CPB 0210 spans nearly 300 ICD-10-CM codes. The table below organizes the major clinical categories by indication type. Every row maps to codes listed in the actual policy data.

Aetna Phonophoresis Billing Guidelines and Action Items 2025

Here's what your billing team and practice managers need to do right now.

CPT, HCPCS, and ICD-10 Codes for Phonophoresis Under CPB 0210

Covered CPT Codes (When Medical Necessity Criteria Are Met)

Key ICD-10-CM Diagnosis Codes

The full CPB 0210 ICD-10 list contains 297 codes. Below are all codes from the policy data provided. Cross-reference this list against your charge capture to confirm your active diagnosis codes are covered.

The full CPB 0210 ICD-10-CM list contains 297 codes. The remaining 217 codes are available in the complete policy at app.payerpolicy.org/p/aetna/0210.

One more note on phonophoresis billing under this policy: the single CPT code (97035) doing all the heavy lifting here means your ICD-10 pairing is the primary lever Aetna uses to assess medical necessity at the claim level. A weak or mismatched diagnosis code kills the claim before a human reviewer ever reads the notes. Get your ICD-10 pairings right.