Head and Neck Ultrasound - (0549) — MM 0549 | CIGNA Coverage Update

Cigna modified MM 0549 for head and neck ultrasound (CPT 76536), effective October 16, 2025. Here's what changes for billing teams.

Cigna Healthcare updated its head and neck ultrasound coverage policy under MM 0549, governing CPT 76536 — real-time ultrasound of soft tissues of the head and neck, including thyroid, parathyroid, and parotid gland imaging. The policy lists 308 covered ICD-10-CM diagnosis codes, making diagnosis code selection the single biggest claims risk for your billing team. If you bill CPT 76536 to Cigna and your diagnosis mapping isn't current, expect claim denial.

Quick-Reference Table

Cigna Head and Neck Ultrasound Coverage Criteria and Medical Necessity Requirements 2025

The Cigna head and neck ultrasound coverage policy under MM 0549 covers CPT 76536 when medical necessity criteria are met. The policy description is direct: this is real-time ultrasound of the soft tissues of the head and neck — thyroid, parathyroid, and parotid gland imaging are the cited examples.

Medical necessity drives everything here. Cigna considers CPT 76536 medically necessary when the clinical indication matches an approved ICD-10-CM diagnosis code from the MM 0549 list. With 308 covered codes, the list is broad — but that breadth is deceptive. One wrong code and you're looking at a denial.

The real issue is specificity. The MM 0549 coverage policy spans malignant neoplasms across the lip, tongue, gum, floor of mouth, palate, oropharynx, nasopharynx, hypopharynx, parotid gland, and major salivary glands, plus a large range of skin malignancies of the face, eyelid, ear, scalp, and neck. Your coders need to select the most specific ICD-10 code available — not a default or a close match.

This coverage policy does not address transcranial Doppler studies, carotid vessel duplex scans, or ultrasound used for biopsy guidance. Those are separate policies. If your practice uses CPT 76536 for biopsy guidance, MM 0549 does not apply and you need a different coverage determination.

The policy does not explicitly list prior authorization requirements in the summary provided. That said, prior authorization rules vary by plan and market. Check the specific Cigna plan before billing — prior auth requirements can differ between commercial, Cigna Medicare Advantage, and employer-sponsored plans.

Cigna Head and Neck Ultrasound Exclusions and Non-Covered Indications

MM 0549 draws three clean lines around what it does not cover under this policy.

Transcranial Doppler studies are excluded. If your practice performs these and bills CPT 76536, stop. That's the wrong code and the wrong policy.

Carotid vessel duplex scans are also excluded from this coverage policy. Carotid duplex imaging has its own CPT codes (93880, 93882) and its own Cigna coverage framework.

Ultrasound for biopsy guidance is excluded from MM 0549. Ultrasound guidance for biopsies uses CPT 76942 and falls under a different coverage determination. Don't roll biopsy guidance into a CPT 76536 claim — that's a coding error and a denial waiting to happen.

Coverage Indications at a Glance

Cigna Head and Neck Ultrasound Billing Guidelines and Action Items 2025

1. Audit your CPT 76536 ICD-10 crosswalk before October 16, 2025.
Pull every CPT 76536 claim from the last 90 days. Compare the diagnosis codes against the MM 0549 covered code list. Any code not on that list is a denial risk after the effective date.

2. Train coders on specificity within the C44.xx range.
The skin malignancy codes in MM 0549 go deep — right upper eyelid, left lower eyelid, right ear, specific parts of the face. Unspecified codes like C44.300 exist in the list, but Cigna's medical necessity standard rewards specificity. Use the most precise code the documentation supports.

3. Separate CPT 76536 from biopsy guidance claims.
If your workflow bundles ultrasound of a thyroid nodule with biopsy guidance in a single encounter, make sure CPT 76942 (biopsy guidance) and CPT 76536 (diagnostic soft tissue ultrasound) are billed correctly as separate services with separate medical necessity documentation. MM 0549 does not cover 76536 when used for guidance — that's a different claim entirely.

4. Verify prior authorization rules by plan before October 16, 2025.
MM 0549 doesn't spell out prior authorization requirements in the summary, but Cigna plan-level PA requirements vary. Pull your current PA grid for CPT 76536 and confirm it's current. A missing PA is a cleaner denial than a medical necessity denial — and it's avoidable.

5. Do not use MM 0549 for transcranial Doppler or carotid duplex billing.
If someone on your team has been using CPT 76536 for carotid or intracranial studies, correct that now. Those services have separate CPT codes and separate Cigna coverage policies. Billing 76536 for those procedures is both a coding error and a medical necessity mismatch.

6. Update your encounter forms and order sets.
If your practice uses paper or electronic encounter forms with pre-loaded ICD-10 codes for head and neck ultrasound, update them to reflect the MM 0549 approved list. Stale encounter forms are a primary source of mismatched diagnosis codes on claims.

7. Loop in your compliance officer if you bill high volumes of CPT 76536.
If head and neck ultrasound billing represents significant reimbursement for your practice, have your compliance officer review the updated MM 0549 criteria before the October 16 effective date. Cigna's 308-code list is specific enough that a systematic review is worth the time.

CPT, HCPCS, and ICD-10 Codes for Head and Neck Ultrasound Under MM 0549

Covered CPT Codes (When Medical Necessity Criteria Are Met)

Key ICD-10-CM Diagnosis Codes

The full MM 0549 list includes 308 ICD-10-CM codes. Below is the complete set included in the policy data. Every code in this table is confirmed from the actual Cigna MM 0549 policy document.

The complete MM 0549 ICD-10-CM list includes 308 codes. The 228 additional codes not listed in the policy data excerpt above cover extended ranges within the categories shown. Access the full code list at PayerPolicy.org.