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N333 Remark Code: Prior Placement Date Missing/Invalid

N333 means the prior placement date, meaning when the item being replaced (such as a crown, bridge, or denture) was originally placed, was missing, incomplete, or invalid, so the payer could not apply its replacement rules.

Code: N333 (RARC N333)
Status: Active In use since December 2, 2004.
Code set: Remittance Advice Remark Codes (RARC)
Group codes: CO (Contractual Obligation): The claim was denied for a missing or unusable prior placement date. The provider corrects the data before any patient billing is considered.
PR (Patient Responsibility): If the corrected date shows the replacement falls inside the plan's waiting period, a later denial may shift to the patient under plan terms. That is a separate determination from N333 itself.
Official description: Missing/incomplete/invalid prior placement date.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What N333 means

When a patient needs a replacement crown, bridge, denture, or similar prosthesis, most dental plans ask two questions: is this a replacement, and when was the original placed? N333 is used when the answer to the second question is missing or not usable.

The dental claim form has a place to indicate a replacement and the date of prior placement. If that is left blank, partly completed, or set to an impossible date, the payer cannot evaluate the frequency limit and returns CARC 16 with N333.

Common causes

The replacement indicator was marked “yes” but the prior placement date was not filled in.
Only a year was entered where the payer expects a full date.
The date recorded is after the date of service for the replacement.
The original work was done by another office and the date was never obtained.
The office reported the date of the patient’s last visit instead of the date the prosthesis was placed.

How to fix it

Search your own records first. If your practice placed the original, the treatment history has the date.
Ask the prior provider or the patient if the work was done elsewhere. Some payers can also confirm placement dates from their claim history.
Enter the complete date in the prior placement field and confirm the replacement indicator is set correctly.
Check the plan’s replacement limit so you know whether the corrected claim is likely to be covered and can inform the patient.
Resubmit the corrected claim following the payer’s correction process, including the original claim number where required.

How to prevent it

Ask about previous crowns, bridges, and dentures during treatment planning, not after the work is done. Record the original placement date in the chart and verify the plan’s replacement frequency before starting treatment so the patient knows what may be covered.

Codes that may appear with N333

CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacks required information; N333 names the prior placement date.
PR-119 (Benefit maximum for this time period or occurrence has been reached.): A benefit maximum for the time period has been reached, which is what a recent prior placement can trigger once the date is known.

N336 (Missing/incomplete/invalid replacement date.): Used when the replacement date itself, rather than the original placement date, is missing or invalid.
N308 (Missing/incomplete/invalid appliance placement date.): Covers a missing or invalid appliance placement date for the current appliance.
N384 (Records indicate that the referenced body part/tooth has been removed in a previous procedure.): Indicates the body part or tooth was already removed in an earlier procedure.

N333 FAQ

What is a prior placement date?

It is the date the original restoration, prosthesis, or appliance was placed. When you bill a replacement, the payer uses it to check how long the old one lasted.

What if the patient does not know when the old item was placed?

Check your records, the prior dentist's records, or the payer's claim history. If no date can be found, ask the payer how it wants an unknown date reported rather than guessing.

Why do payers care about the original date?

Many plans only cover replacement of certain prosthetics after a set number of years. The date lets them apply that limit.

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