Laboratory Testing Services - (0604) — MM 0604 | CIGNA Coverage Update

Cigna Healthcare modified MM 0604, its laboratory testing services coverage policy, effective February 14, 2026—flagging over 1,230 CPT codes across two categories: experimental/investigational/unproven, and not medically necessary when used for screening. Here's what billing teams need to do.

This update to the MM 0604 Cigna Healthcare coverage policy is one of the broadest lab policy refreshes you'll see from a commercial payer. It covers everything from oncology biomarkers and nephrology panels to prescription drug monitoring and infectious disease testing. If your practice or lab bills any of the U codes (0000U–0600U range) or multianalyte assay with algorithmic analysis (MAAA) codes, you have exposure here. Pull your payer mix reports before you assume this doesn't touch you.

Quick-Reference Table

Cigna Healthcare Laboratory Testing Coverage Criteria and Medical Necessity Requirements 2026

The MM 0604 Cigna system coverage policy sets the framework Cigna uses to decide whether any lab test is clinically useful or should be denied as experimental, investigational, or not medically necessary. Two standards drive every coverage decision under this policy.

First, Cigna looks at prescribing and test development standards. Second, it weighs recommendations from the United States Preventive Services Task Force (USPSTF) and published professional societies. If a test doesn't have strong guideline support, it gets flagged—regardless of how recently it received a CPT code.

Medical necessity is the threshold question for every claim. A test that lacks USPSTF or specialty society endorsement will likely land in one of two denial buckets: experimental/investigational/unproven, or not medically necessary when performed as screening. These are not the same denial—and the distinction matters for your appeals strategy.

Some tests have their own companion Cigna coverage policy. If a specific test you bill has a dedicated policy (for example, a separate policy on BRCA testing or cell-free DNA), that document governs—not MM 0604. Use MM 0604 as the fallback framework, not the final word, for those tests.

Prior authorization requirements for individual lab tests fall under separate Cigna prior authorization lists. MM 0604 doesn't grant or waive prior auth—it only sets the coverage position. Check your Cigna prior auth schedule separately, especially for high-dollar molecular tests.

Cigna Laboratory Testing Exclusions and Non-Covered Indications 2026

This is where MM 0604 creates real claim denial risk for billing teams. The policy splits non-covered tests into two distinct groups, and you need to know the difference.

Group 1: Experimental, Investigational, or Unproven. These codes get the hardest denial. Cigna considers them to lack sufficient clinical evidence. Eight codes appear explicitly in this category in the February 2026 update:

These denials are difficult to overturn without new clinical data. If your oncology or nephrology group has been billing any of these, stop and review immediately.

Group 2: Not Medically Necessary When Performed as Screening. This is a larger and more nuanced group. The keyword is "as screening." Many of these tests are covered in diagnostic or monitoring contexts—but Cigna will deny them when billed without clinical indication supporting a non-screening use. The code list here runs well over 100 codes.

The real trap is documentation. If your diagnosis coding looks like a wellness or screening visit, these tests will deny even if the ordering physician intended them diagnostically. Your medical necessity documentation and ICD-10 coding must reflect the specific clinical question being answered—not a general check or population screen.

Coverage Indications at a Glance

Cigna Laboratory Testing Billing Guidelines and Action Items 2026

The effective date of February 14, 2026 has already passed. If you haven't reviewed your Cigna lab claims since mid-February, start this week.

CPT, HCPCS, and ICD-10 Codes for Laboratory Testing Under MM 0604

Experimental / Investigational / Unproven CPT Codes

Not Medically Necessary as Screening — Selected CPT Codes

The full not-medically-necessary list under MM 0604 exceeds 100 codes. The following represent the highest-volume categories. The complete list is available at the full policy document linked below.

The full MM 0604 code list contains 1,230 CPT codes. The table above covers codes explicitly detailed in the February 14, 2026 policy data. Access the complete list at app.payerpolicy.org.

ICD-10-CM Codes: MM 0604 does not specify a fixed list of ICD-10-CM diagnosis codes. Coverage depends on clinical context and whether the diagnosis supports medical necessity for the specific test billed. Use diagnosis codes that accurately reflect the clinical question being answered—not preventive or screening codes for tests in the not-medically-necessary-as-screening group.

HCPCS Codes: No HCPCS codes are listed in the February 14, 2026 MM 0604 policy data.