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CO-154 Denial Code: Day's Supply Not Supported

CO-154 means the payer decided the information submitted does not support the day's supply billed, most often on a pharmacy or supply claim where the quantity and directions do not add up to the days claimed.

Quick facts

Code
CO-154 (CARC 154)
Status
Active In use since October 31, 2002; last modified September 30, 2007.
Code set
Claim Adjustment Reason Codes (CARC)
Group codes
  • CO (Contractual Obligation): The dispensing provider absorbs the adjusted amount for the unsupported supply.
  • PR (Patient Responsibility): Sometimes used when the plan leaves the extra supply to the member, for example a refill requested early for the patient's convenience. Check plan rules before collecting.
Official description
Payer deems the information submitted does not support this day's supply.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What CO-154 means

CARC 154 reads “Payer deems the information submitted does not support this day’s supply.” Day’s supply is how many days a dispensed quantity should last. Payers use it to enforce refill timing, quantity limits, and benefit periods. When the claimed days do not line up with the quantity and the prescriber’s directions, or exceed what the plan allows, the payer adjusts the claim with CO-154.

This code is most at home on pharmacy and supply claims. On pharmacy transactions an NCPDP reject code may appear instead of or alongside a remark code.

Example: a supplier dispenses 200 test strips with directions to test twice a day, and bills a 30-day supply. The directions support 100 days, not 30, so the payer questions the billing. The reverse also happens: a 90-day supply billed where the plan only allows 30 days per fill.

Common causes

  • Quantity and directions don’t match the days reported on the claim.
  • “Use as directed” prescriptions with no specific frequency, leaving the payer unable to verify days.
  • Plan limit on days per fill (for example a 30-day retail limit) exceeded.
  • Early refill relative to the previous fill’s day’s supply.
  • Package size rounding, such as an inhaler or pen that cannot be split, not documented properly.
  • Unit of measure errors in NDC quantity reporting.

How to fix it

  1. Recalculate the day’s supply from the quantity dispensed and the prescribed directions.
  2. If your days value was wrong, reverse and resubmit (pharmacy) or submit a corrected claim with resubmission code 7 (medical claim) using the correct days and quantity.
  3. If directions were vague, get clarified directions from the prescriber and document them before rebilling.
  4. If the supply was correct but exceeds a plan limit, ask the payer about an override or exception process, and supply the prescriber’s reason.
  5. Appeal if you have documentation that supports the days billed and the payer still refuses.

How to prevent it

  • Require specific directions for every dispensed item; avoid billing on “as directed” alone.
  • Build day’s supply calculators into dispensing software, including package-size rules.
  • Know each plan’s per-fill limits and refill-too-soon thresholds.
  • Check NDC quantity and unit of measure against the package before submission.
  • Review ERA patterns for recurring CO-154 by product to find systematic quantity setups. See reading CARC and RARC codes.

Specialty notes

DME and medical supply companies billing diabetic, ostomy, or urological supplies often face quantity-per-period policies. Keep the prescriber’s usage frequency in the file, since payers may request it on audit.

Remark codes that may appear with CO-154

  • M119 (Missing/incomplete/invalid/ deactivated/withdrawn National Drug Code (NDC).): The NDC was missing or invalid, which prevents the payer from validating quantity against days.
  • N362 (The number of Days or Units of Service exceeds our acceptable maximum.): The number of days or units exceeds what the payer allows for the service.
  • CO-153 (Payer deems the information submitted does not support this dosage.): The dose itself is unsupported, rather than the number of days it covers.
  • CO-152 (Payer deems the information submitted does not support this length of service.): Unsupported length of service for procedures and stays, not dispensed supplies.
  • CO-35 (Lifetime benefit maximum has been reached.): A lifetime benefit maximum was reached, which is a plan limit rather than a quantity mismatch.
  • CO-151 (Payment adjusted because the payer deems the information submitted does not support this many/frequency of services.): The number or frequency of services is unsupported, often used for repeated supplies.

CO-154 FAQ

Who usually gets CO-154?

Mostly pharmacies and suppliers who dispense drugs or supplies for a period of time, such as diabetic testing supplies or specialty medications. Professional office claims see it less often.

How is day's supply calculated?

Generally it is the quantity dispensed divided by the daily usage in the prescriber's directions. If the directions and quantity imply a different number of days than you billed, the payer may apply CO-154.

Can I just rebill with a smaller day's supply?

Only if the corrected value matches the prescription and the quantity actually dispensed. Changing the days without supporting documentation can create an audit risk.