By Dr. Heather Signorelli, DO, board-certified pathologist and founder of NatRevMD.
Quick answer: CO-150 is the claim adjustment code a payer uses when it decides your documentation does not support the level of service you billed. Under its R49 policy, Cigna uses it to pay a lower E/M level than you submitted. The “CO” means contractual obligation, so you cannot bill the patient for the difference. You can appeal with the visit note and an explanation of your medical decision making.
Update, October 2026: Cigna’s policy has changed by state since we first published. Cigna paused it in California while the state reviews it, and in March 2026 Maryland’s insurance regulator ordered Cigna to stop automatically downcoding E/M claims. Other states may differ, so check your Cigna remittances and Cigna’s current R49 policy before you rely on the dates below.
Beginning October 1st, 2025, physicians across the country may see their claims automatically downcoded under Cigna’s Reimbursement Policy R49. This controversial policy allows Cigna to lower E/M codes one level if they decide the “encounter criteria” don’t justify the complexity you billed. The result? Lost revenue and added administrative burden.
One key signal will be denial code C150 — meaning your higher-level E/M visit was cut down.
Here’s what every practice needs to know about this policy and how to defend your revenue.
What Is Cigna’s Downcoding Policy (R49)?
According to the official policy:
- Effective October 1, 2025
- Applies to codes 99204–99205, 99214–99215, and 99244–99245
- Claims may be reduced one level if Cigna believes documentation does not support the billed level
- Physicians may appeal by submitting medical records to substantiate MDM or time.
Why Is It Controversial?
- AMA guidelines (2021) state that E/M code levels are determined by Medical Decision Making (MDM) or time, not by diagnosis
- AMA policy opposes blanket, automatic downcoding and insists physicians must have the chance to provide documentation before payment is reduced.
- CMA has called this approach unlawful because it conflicts with nationally recognized coding standards.
Real-World Examples of Downcoding
From AMA case studies:
- COPD exacerbation billed as 99215 → downcoded to 99213 despite complex management.
- Diabetes with neuropathy billed as 99214 → downcoded to 99213 because diagnosis listed only as “diabetes.”
These illustrate how denial code C150 will appear in practice: claims cut without considering full documentation.
How to Protect Your Practice
- Document comprehensively. Spell out MDM elements, time spent, and comorbidities.
- Use precise ICD-10 codes. Example: E11.65 (diabetes with hyperglycemia) instead of just E11.9 (diabetes).
- Audit your charts. Make sure level 4 and 5 visits show complexity clearly.
- Appeal aggressively. Use AMA’s sample appeal letter, cite both AMA guidelines and Cigna’s own appeal clause.
- Educate your team. Train billing staff to recognize denial code C150 and other downcoding signals (CO150, M85, N610, CARC 186).
Conclusion
Cigna’s downcoding policy is a direct threat to practice revenue and patient access. But with strong documentation, vigilant denial management, and proactive appeals, you can defend against inappropriate downcoding.
Take action now: prepare your team, tighten your notes, and don’t let denial code C150 take you by surprise.
Frequently asked questions
CO-150 means the payer decided your documentation does not support the level of service you billed. Under its R49 policy, Cigna uses it to pay a lower E/M level. Because CO means contractual obligation, you cannot bill the patient for the difference.
The policy applies to E/M codes 99204 to 99205, 99214 to 99215, and 99244 to 99245. Cigna may reduce these claims one level if it believes the documentation does not support the billed level.
Send the visit note and medical records that support your medical decision making or time. You can also use the AMA’s sample appeal letter and cite both AMA guidelines and Cigna’s own appeal clause. In addition, train billing staff to spot downcoding on your remittances so no reduced claim slips by.
