Answers / Assistant billing and IDR
Assistant-at-surgery billing and federal IDR
Assist lines are billed with modifiers 80, 81, 82, or AS on the primary procedure code, and payers benchmark them as small percentages of the primary fee. In No Surprises Act arbitration those lines are priced on the case instead, and decided assistant disputes paid a median of $12,203 across 2023 through 2025. High-frequency assist books batch same-payer claims into combined filings.
How the line is built
An assist bills the primary procedure code with a modifier: 80 for a physician first assist, 82 when a qualified resident was unavailable, AS for a PA, nurse practitioner, or clinical nurse specialist assist. Contracted rates for those modifiers run as percentages of the primary fee allowance, commonly in the mid-teens. The QPA inherits that construction, so the benchmark on an out-of-network assist line is a percentage of a median of discounted primary fees: a small number derived from other small numbers.
How arbitration reprices it
The No Surprises Act directs arbitrators to consider the QPA alongside the reality of the case: complexity, acuity, the provider's qualifications, and what the service involved. An assist on a multi-level instrumented fusion or a redo joint is hours of skilled operative work, and the offer can document that directly. The record shows how the contest resolves: 89.8 percent of decided assistant disputes went to the provider, at a $12,203 median, against benchmarks constructed as fractions.
Batching is the natural shape
Assist services produce claims in volume against a short list of payers, which fits the batching rules precisely: disputes with the same payer for the same or related codes combine into one filing when their negotiation windows align, and every line from a single case files together. A month of spine assists against one plan can move as one batched arbitration instead of a dozen stragglers, cutting per-claim cost and presenting the arbitrator a consistent story across cases.
The cost structure that fits
High frequency and mid-size awards make percentage representation expensive in aggregate: 15 to 25 percent of every $12,203 median award, month after month. The fixed costs are minor: $15 per party in administrative fees and a refundable arbitrator deposit on each dispute. Lido IDR files batched assist claims for a flat fee per arbitration, priced from the published medians at idrexplorer.com, so the repricing arbitration delivers stays with the service doing the work.
Batch your assists against the record
Lido IDR structures batched assistant filings and prices offers from published awards, for a flat fee per arbitration. Talk to an IDR specialist.