One Insurer, One City, a 6x Price Spread on the Same Scan — and It's Even Wider Than It Looks

A CT scan of the head, without contrast — CPT 70450 — is one of the most standardized procedures in medicine. Same machine class, same protocol, same read.

In the Nashville metro area, BlueCross BlueShield of Tennessee pays some providers a median of $54 for it. It pays others $333.

That's a 6.2x spread, inside one insurer's network, inside one city, for the same procedure. We found it by extracting the plan's federally mandated price file — the one every commercial insurer has been required to publish since 2022 — and computing provider-level median rates for 365 imaging providers across ten common imaging codes.

Then we noticed something stranger than the spread.

The spread is large on every code

Provider-level median negotiated rates, reconstructed to the global (professional + technical) rate, for 365 Nashville-MSA imaging providers — BCBS-TN home-network file published 2026-06-27. The near-6.2x uniformity across codes is partly a property of this provider-median reconstruction; measured like-for-like on the raw file the spreads are wider and differ by code (a head CT global rate spans 14x low-to-high; an MRI brain, 8x). Negotiated rates are contracted amounts; actual payment can vary with plan terms.

Nine unrelated procedures — CT, MRI, X-ray, ultrasound — and every one carries a large provider-to-provider spread. Reconstructed to the global rate and taken at each provider's median, that spread lands near 6.2x across the board; but that near-uniformity is partly the measurement. In the raw file, the like-for-like spreads are wider and they are not one constant multiple — a head CT global rate runs 14x from the lowest-paid provider to the highest, an MRI brain runs 8x.

So the file is not stamping a single multiplier on your whole fee schedule. What it is doing is more useful to know: on every procedure we looked at, where a provider sits is driven far more by who they are than by the scan itself, and the gap between the floor and the ceiling is enormous — at least 6x, and wider than that measured cleanly.

In other words: the payer isn't really pricing your CT scans one at a time. It's pricing your position.

(Screening mammography, at 4.0x on this reconstructed view, is the narrowest of the set — screening mammograms sit under distinct benefit-design and pricing pressure than diagnostic imaging.)

What this means if you run provider finances

Three things fall out of this pattern, and none of them are visible from your own contract alone.

1. You have a position, not just a rate sheet. Where a provider sits is consistent enough across procedures that the negotiation that matters is not about any individual code — it's about where you sit in the distribution overall. A provider at the bottom of this market isn't underpaid on CT scans specifically; they're underpaid across the board.

2. The distribution is knowable. The payer has always known exactly where you sit — that's their side of the table. Since 2022, the same information has been sitting in their published files. The file we analyzed is public. Reading it took engineering; that's the part we built.

3. "Market rate" claims are now checkable. When a payer rep says an offer is competitive for your market, that's a claim about a distribution — the one in the table above. Half the providers in this market are being paid below $179 for a head CT while the top of the same network is at $333. "Competitive" is doing a lot of work in that sentence.

One honest caveat

One clarification on the numbers. The file actually does label each rate as professional, technical, or global (via the CPT modifier — 26, TC, or none); the figures above are reconstructed global rates, professional plus technical. We flag this because it makes the finding conservative: measured like-for-like on a single component, the raw spreads are wider than the ~6.2x shown here, not narrower. And a negotiated rate is a contracted amount, not a guarantee of what any specific claim pays. What the file gives you is the shape of the market and your position in it — which is precisely the thing you can't get from your own contract.

See your own multiplier

If you want to know where your organization sits in your payer's distribution, that's the exact question our Gap Check answers: send us your fee schedule, and we'll show you the gap — what you're paid, what the same payer pays comparable providers in your market, and what you could be making. No sales call required to find out.

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Methodology: DeductibleData extracted all professional-class negotiated rates for ten imaging CPTs from the BCBS of Tennessee home-network MRF series published 2026-06-27, filtered to 365 Nashville-MSA imaging providers (45,678 rate rows). Per-provider medians are computed across plan variants to avoid conflating plan-design differences with provider-level rate position. Provider identities are not disclosed. Data available under the Transparency in Coverage Rule.