Surgical Treatment for Chest Wall Deformities - (0309) — MM 0309 | CIGNA Coverage Update

TL;DR: Cigna Healthcare modified MM 0309 covering surgical treatment for chest wall deformities, effective September 26, 2025. Here's what billing teams need to do.

Cigna Healthcare updated its coverage policy for surgical repair of chest wall deformities under MM 0309 in the Cigna system. This policy governs reimbursement for CPT codes 21740 and 21742 (open and Nuss procedure repairs for pectus excavatum and pectus carinatum), plus a range of reconstruction codes spanning CPT 11970, 15734, 15756, 15777, 19325, 19357, 19361, 19380, 20900, and 20902. If your practice bills these procedures for patients with pectus excavatum, pectus carinatum, or Poland syndrome, the effective date of September 26, 2025 is your line in the sand.

Quick-Reference Table

Cigna Chest Wall Deformity Surgery Coverage Criteria and Medical Necessity Requirements 2025

The Cigna chest wall deformity surgery coverage policy under MM 0309 applies to three distinct conditions: pectus excavatum, pectus carinatum, and Poland syndrome. Each has its own surgical pathway, and the codes break apart accordingly. Getting the right diagnosis paired with the right procedure code is where most claim denial risk lives.

For pectus excavatum and pectus carinatum repairs, CPT 21740 (open reconstructive repair) and CPT 21742 (minimally invasive Nuss procedure) are considered medically necessary when the applicable selection criteria are met. Cigna's coverage policy requires meeting those criteria — not just having a diagnosis. If your documentation doesn't speak directly to the specific medical necessity thresholds Cigna defines, expect a denial regardless of the clinical picture.

Poland syndrome is a different animal. This congenital condition involves absence or underdevelopment of chest wall muscles and, often, breast tissue on the affected side. Cigna covers a wider set of reconstructive codes for Poland syndrome, including breast-specific CPT codes 19325, 19357, 19361, and 19380. These are considered medically necessary when used to report surgical treatment of Poland syndrome — not cosmetic breast surgery, not elective augmentation. The distinction matters enormously for your authorization and billing documentation.

Prior authorization is the critical checkpoint here. Before submitting claims for any of these procedures, confirm your prior auth request explicitly references MM 0309 and maps the patient's documented condition to the criteria in the applicable coverage section. A prior auth that's too generic — just citing pectus excavatum without meeting the criteria detail — won't protect you on the claim.

The reconstruction codes for Poland syndrome go further. CPT 15734 (muscle, myocutaneous, or fasciocutaneous flap; trunk), CPT 15756 (free muscle or myocutaneous flap with microvascular anastomosis), and CPT 15777 (implantation of biologic implant for soft tissue reinforcement) all carry medical necessity coverage when used specifically for Poland syndrome surgical treatment. CPT 20900 and 20902 for bone grafts — minor and major respectively — also fall under the same covered bucket when applied to chest wall deformity repair. CPT 11970 (replacement of tissue expander with permanent implant) and CPT 19357 (tissue expander placement in breast reconstruction) round out the staged reconstruction pathway.

Cigna Chest Wall Deformity Surgery Exclusions and Non-Covered Indications

The coverage policy draws a sharp line between reconstructive surgery for a documented congenital or structural deformity and cosmetic surgery. CPT 19325 for breast augmentation is covered under MM 0309 only when it's used to report surgical treatment of Poland syndrome. Billed outside that specific context — even if the same surgeon performs it during the same encounter — it won't meet medical necessity under this policy.

The same logic applies to CPT 19361 (breast reconstruction with latissimus dorsi flap) and CPT 19380 (revision of reconstructed breast). These codes exist in a gray zone for payers. Cigna covers them here because Poland syndrome creates a legitimate reconstructive indication. Your documentation has to make that case clearly. Vague operative notes that don't connect the procedure to Poland syndrome's specific anatomy will get pulled on audit.

Cosmetic surgery for mild chest wall asymmetry — without meeting the severity and functional criteria in MM 0309 — is not covered. If you're unsure whether a specific case clears the threshold, loop in your compliance officer before the procedure, not after you get the denial.

Coverage Indications at a Glance

Cigna Chest Wall Deformity Billing Guidelines and Action Items 2025

The real risk with MM 0309 is conflating the three covered conditions and their code sets. Pectus repairs and Poland syndrome repairs have different applicable code groups, and mixing them up — even accidentally — generates denials that are hard to overturn without strong operative documentation.

Here are your action items before the September 26, 2025 effective date:

If you handle a significant volume of thoracic or pediatric reconstructive cases, talk to your compliance officer about a targeted MM 0309 audit before September 26, 2025. This policy touches enough code families — thoracic, plastic, breast reconstruction, flap surgery, bone grafts — that gaps in one area tend to signal systemic documentation issues.

CPT, HCPCS, and ICD-10 Codes for Chest Wall Deformity Surgery Under MM 0309

Covered CPT Codes (When Selection Criteria Are Met)

Note: The policy data includes a reference string "2006b Oct;30(4):637-43" in the code table. This appears to be a citation entry, not a billable CPT code. Do not use it on claims.

No ICD-10-CM codes were specified in the MM 0309 policy data. Your billing team should map to the appropriate ICD-10 diagnosis codes (pectus excavatum, pectus carinatum, Poland syndrome) according to your standard coding protocols and confirm against Cigna's applicable diagnosis coverage lists.