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CO-153 Denial Code: Dosage Not Supported

CO-153 means the payer decided the claim information does not support the dosage billed, usually for a drug or biological. The amount is adjusted as the provider's responsibility under CO unless the dosage is corrected or supported on appeal.

Quick facts

Code
CO-153 (CARC 153)
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 provider absorbs the adjusted amount for the unsupported dosage. It is not billable to a network patient.
  • PR (Patient Responsibility): Occasionally used when the plan leaves the cost of the unsupported dose to the patient. Verify plan terms and whether an advance notice was required before billing.
Official description
Payer deems the information submitted does not support this dosage.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What CO-153 means

CARC 153 reads “Payer deems the information submitted does not support this dosage.” It is almost always tied to a drug, biological, or other item billed by quantity. The payer compared the dose on the claim with its dosing policy, the diagnosis, or the records and decided the amount billed is not justified.

The result may be a reduction to the dose the payer considers supported, or a denial of the line. Under the CO group code the adjusted amount stays with the provider.

Example: an infusion is billed at 20 units of a HCPCS J-code whose descriptor is per 10 mg, implying 200 mg. The administration record shows 100 mg. The payer allows 10 units and adjusts the rest with CO-153.

Common causes

  • Unit conversion errors between the milligrams given and the HCPCS billing unit in box 24G.
  • NDC quantity or unit of measure in the shaded area of box 24 not matching the HCPCS units.
  • Dose above the payer’s policy maximum for the diagnosis, weight, or frequency, without documentation explaining why.
  • Wastage billed incorrectly, for example discarded drug billed without the JW modifier where the payer requires it, or billed when policy does not allow it.
  • Order and administration record disagree, or the record lacks patient weight or body surface area for weight-based dosing.
  • Diagnosis in box 21 does not support the higher dose under the payer’s coverage policy.

How to fix it

  1. Compare the claim to the record. Recalculate units from the dose administered and the HCPCS descriptor.
  2. If the units or NDC quantity were wrong, submit a corrected claim (resubmission code 7 in box 22 with the original claim number).
  3. If wastage was the issue, split the administered and discarded amounts on separate lines with the modifiers the payer requires (JW for discarded, JZ when none was discarded, per Medicare rules).
  4. If the dose was right, appeal with the physician order, medication administration record, weight or BSA, and any clinical rationale or guideline supporting the dose.
  5. Check the payer’s drug policy for maximum dosing and any prior authorization that capped the dose.

How to prevent it

  • Build unit conversion into charge entry so staff enter the dose given and the system computes billing units.
  • Validate NDC, unit of measure, and quantity against HCPCS units before submission. The Claims Validator can catch mismatches like these before the claim goes out.
  • Document weight and dosing rationale for weight-based and above-label doses.
  • Keep payer drug policies current for high-cost infusions and injectables, since dose caps change.
  • Match authorization to the planned dose and update it when the regimen changes. See authorization denials.

Specialty notes

Oncology, infusion centers, rheumatology, and ophthalmology see CO-153 most because of high-cost, weight-based drugs. Pharmacy claims may carry an NCPDP reject code alongside it instead of a RARC.

Remark codes that may appear with CO-153

  • M127 (Missing patient medical record for this service.): The payer wants medical records, such as the administration record or order, to support the dose.
  • N115 (This decision was based on a Local Coverage Determination (LCD).): A local coverage determination, which often sets dosing limits, was applied.
  • M119 (Missing/incomplete/invalid/ deactivated/withdrawn National Drug Code (NDC).): The drug's NDC was missing, incomplete, or invalid, which can make dosage impossible to verify.
  • CO-152 (Payer deems the information submitted does not support this length of service.): Same family of finding, but about length of service rather than dose.
  • CO-154 (Payer deems the information submitted does not support this day's supply.): Applies to a prescription's day's supply rather than the dose given.
  • 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 not supported, rather than the amount per service.
  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Used when drug information such as the NDC is missing or invalid, rather than unsupported.

CO-153 FAQ

Does CO-153 mean the drug is not covered?

Not necessarily. It usually means the payer accepts the drug but does not accept the amount billed, based on the documentation, the order, or its dosing policy.

How do HCPCS units relate to CO-153?

Drug HCPCS codes are billed in units defined by the code descriptor. If units in box 24G do not convert correctly to the dose in the record, the billed dosage looks unsupported.

Should I appeal or correct CO-153?

Correct and resubmit if the units or NDC quantity were wrong. Appeal with the order and administration record if the dose was accurate and clinically justified.