Health insurance denial & claim adjustment codes

What health insurance denial code 50 means on your EOB

The plan decided the care was not medically necessary. This is the most appealed denial category in American health insurance, and the appeal turns on clinical documentation and the plan's own published criteria.

What usually causes it

• The records sent did not demonstrate the criteria the plan applies.
• A required step-therapy or conservative-treatment sequence was not documented.
• The reviewer may not have had the full chart.

The documents that decide it

• The denial letter naming the criteria used.
• The plan's published medical policy for this service.
• Your provider's letter of medical necessity and supporting chart notes.

What to do next

Ask for the plan's written criteria and the reviewing clinician's specialty. If the reviewer was not a specialist in the relevant field, that itself is grounds in many states.

This page explains what a code means. It is information, not advice — it does not tell you whether your specific claim should have been paid, and it is not legal, medical, or insurance advice. Your plan documents and your denial notice govern your situation.