Claims · Updated 2026-09-08 · 4 min read

Does Principal downgrade fillings?

Principal downgrades 11.2% of posterior composites and 10.2% of crowns — a low rate on a small sample, with 16.7% of its downgrades carrying no remark.

Principal downgrades about one posterior composite in nine — 11.2% of paid posterior composite lines as of September 2026 — and about one crown in ten, 10.2%. Both are low rates by the standards of this cluster, and both rest on small samples: 226 eligible paid lines in total and 30 downgrades. The number worth carrying is the silent share, 16.7%: five of Principal's 30 downgrades carried no downgrade remark. Principal is also the one carrier here that describes the decision as a person's, made on the documentation you sent with the claim.

What we measured

A line is one procedure on one claim; these are paid explanation-of-benefits lines pooled across the practices Kaylie serves, measured on 8 September 2026. Across every downgrade-eligible code, Principal downgraded 30 of 226 paid lines (13.3%), stated 25 and left 5 silent — the remittance carried no downgrade remark, but the allowed amount was below the contracted fee for the billed code, or a substitute line was issued.

Say the sample size out loud when you use these figures. Twenty-five stated downgrades is the minimum at which a silent share can be compared with other carriers at all, and every Principal cell here is built from fewer than 200 lines. The direction — Principal downgrades seldom, and when it does it does not always say so — is solid. The decimals are not.

What Principal's own policy says

Principal's clinical guidelines state the rule and, unusually, name the decision-maker:

"There are times when more than one procedure could correct a dental condition. In these cases, benefits are allowed for the least expensive procedure that will provide professionally acceptable results. This determination is made by a licensed Dental Consultant based on the documentation submitted with the claim."

— Principal Dental Clinical Guidelines, GP62410 (undated)

That last sentence changes what an office can do about it. Where a downgrade is an automatic code substitution written into the plan, there is nothing to send. Where a licensed consultant decides on the documentation submitted, the radiographs, the periodontal charting and the narrative are the lever — and they have to arrive with the claim, not after the decision.

Principal's DHMO schedule states the same rule as an "optional treatment" clause: "If (1) a less expensive alternative procedure, service or course of treatment can be performed in place of the proposed treatment to correct a dental condition, as determined by the Plan; and (2) the alternate treatment will produce a professionally satisfactory result; then the maximum eligible dental expense to be considered for payment will be the less expensive treatment." (Principal DHMO Member Copayment Schedule — California Dental Network Plan 460, undated.) The same document applies it to bridgework: "Fixed bridgework will be covered only when a partial cannot satisfactorily restore the case."

Neither document names posterior composites, amalgam, or a tooth scope. Principal publishes the mechanism; the plan supplies the specifics.

Why it depends on the plan group

"As determined by the Plan" is doing the work in Principal's own sentence. Measured across 3,790 employer groups in August 2026, whether a plan downgrades posterior composites is settled within the group 97.7% of the time against 77.0% at carrier level. At Principal's low base rate that means most groups never produce a downgrade at all, and the handful that do will keep producing them — so one settled claim per group is worth more than the carrier rate.

What to do

• Send the documentation with the claim, not after it. Principal states that a licensed dental consultant decides on what was submitted; a narrative and radiographs that arrive with the claim are the only ones that can prevent the substitution.
• Compare the allowed amount to your contracted fee for the code you billed. One Principal downgrade in six carries no remark, which on this sample is five lines — small, but invisible to anyone reading remarks alone.
• Record the answer against the employer group number rather than the carrier, and note whether the plan is the PPO or the DHMO product, which use different mechanics.
• Quote the patient the difference between the two allowed amounts before treatment where the plan is known to downgrade.
• Re-check this carrier before relying on it. With 30 downgrades in the window, a Principal rate can move materially on a few dozen more claims.

Numbers last refreshed September 2026.

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