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Procedure price report · Pathology

IDH1 gene test for common changes

CPT 81120the billing code this page is about

A laboratory test that looks for the most frequent mutations in the IDH1 gene, usually run on tumor tissue such as brain tumor or leukemia samples.

Hospitals typically charge $312 cash for this outpatient procedure — the median across 1,105 hospitals that filed a usable cash price; the average of the middle 60% is $348. Most fall between $181 and $610 (20th–80th percentile).

Hospitals
1,105
States
49
Filings dated
Aug 2024 – Sep 2026
Computed
September 25, 2026
Prices checked
through September 25, 2026

Median: half of hospitals filed less, half more — and it is a price some hospital actually filed. Average of the middle 60%: the mean of the prices between the 20th and 80th percentiles. We never publish the plain average, the lowest or the highest price: the extremes in hospital price files are chargemaster artefacts, not prices anyone pays.

What hospitals charge, from cheapest to most expensive

Cash price percentiles, outpatient, across 1,105 hospitals. Each figure is a price a hospital filed. 10th: one in ten hospitals charges less; 25th: a quarter charge less; Median: half charge less; 75th: three quarters charge less; 90th: nine in ten charge less.
10th25thMedian75th90th
$139$193$312$560$806

The most expensive tenth of hospitals charges at least 5.8× what the cheapest tenth charges ($139 vs $806).

How the prices are spread

$106 – $133: 43 hospitals$106$133 – $167: 105 hospitals$167 – $209: 102 hospitals$167$209 – $262: 115 hospitals$262 – $328: 156 hospitals$262$328 – $411: 102 hospitals$411 – $515: 116 hospitals$411$515 – $645: 122 hospitals$645 – $809: 92 hospitals$645$809 – $1,013: 46 hospitals$809median $312price bands are equal on a log scale
Hospitals per price band (999 of 1,105 — the bands cover the 5th to 95th percentile)
FromToHospitals
$106$13343
$133$167105
$167$209102
$209$262115
$262$328156
$328$411102
$411$515116
$515$645122
$645$80992
$809$1,01346

By state

The median cash price in each state, against the national median of $312.

Alaska: 2 hospitals filed a usable price — fewer than 10, so no figureAKMaine: 7 hospitals filed a usable price — fewer than 10, so no figureMEVermont: no hospital in the corpus filed a usable priceVTNew Hampshire: 4 hospitals filed a usable price — fewer than 10, so no figureNHWashington: median $253 across 28 hospitalsWA$253Idaho: median $440 across 13 hospitalsID$440Montana: 1 hospital filed a usable price — fewer than 10, so no figureMTNorth Dakota: 4 hospitals filed a usable price — fewer than 10, so no figureNDMinnesota: median $213 across 39 hospitalsMN$213Illinois: median $418 across 50 hospitalsIL$418Wisconsin: median $546 across 73 hospitalsWI$546Michigan: median $267 across 45 hospitalsMI$267New York: median $290 across 35 hospitalsNY$290Massachusetts: median $600 across 21 hospitalsMA$600Oregon: median $416 across 20 hospitalsOR$416Nevada: 4 hospitals filed a usable price — fewer than 10, so no figureNVWyoming: 1 hospital filed a usable price — fewer than 10, so no figureWYSouth Dakota: 1 hospital filed a usable price — fewer than 10, so no figureSDIowa: median $186 across 14 hospitalsIA$186Indiana: median $306 across 28 hospitalsIN$306Ohio: median $406 across 69 hospitalsOH$406Pennsylvania: median $327 across 37 hospitalsPA$327New Jersey: median $213 across 36 hospitalsNJ$213Connecticut: 7 hospitals filed a usable price — fewer than 10, so no figureCTRhode Island: 1 hospital filed a usable price — fewer than 10, so no figureRICalifornia: median $384 across 41 hospitalsCA$384Utah: median $408 across 23 hospitalsUT$408Colorado: median $345 across 17 hospitalsCO$345Nebraska: 3 hospitals filed a usable price — fewer than 10, so no figureNEMissouri: median $387 across 33 hospitalsMO$387Kentucky: median $319 across 23 hospitalsKY$319West Virginia: 7 hospitals filed a usable price — fewer than 10, so no figureWVVirginia: median $277 across 30 hospitalsVA$277Maryland: median $611 across 17 hospitalsMD$611Delaware: 2 hospitals filed a usable price — fewer than 10, so no figureDEArizona: median $919 across 16 hospitalsAZ$919New Mexico: 3 hospitals filed a usable price — fewer than 10, so no figureNMKansas: median $307 across 14 hospitalsKS$307Arkansas: median $415 across 15 hospitalsAR$415Tennessee: median $168 across 32 hospitalsTN$168North Carolina: median $312 across 37 hospitalsNC$312South Carolina: median $685 across 11 hospitalsSC$685Oklahoma: median $305 across 31 hospitalsOK$305Louisiana: median $300 across 13 hospitalsLA$300Mississippi: median $133 across 15 hospitalsMS$133Alabama: 5 hospitals filed a usable price — fewer than 10, so no figureALGeorgia: median $217 across 56 hospitalsGA$217Hawaii: 4 hospitals filed a usable price — fewer than 10, so no figureHITexas: median $290 across 80 hospitalsTX$290Florida: median $226 across 37 hospitalsFL$226
Cash price by state, most expensive first. National median $312. A state needs at least 10 hospitals with a usable price to show a figure.
StateHospitalsMedianvs national20th–80th
Arizona AZ16$919+194%$295 – $1,082
South Carolina SC11$685+120%$378 – $1,142
Maryland MD17$611+96%$375 – $711
Massachusetts MA21$600+92%$335 – $811
Wisconsin WI73$546+75%$305 – $612
Idaho ID13$440+41%$250 – $600
Illinois IL50$418+34%$177 – $634
Oregon OR20$416+33%$196 – $456
Arkansas AR15$415+33%$126 – $474
Utah UT23$408+31%$408 – $480
Ohio OH69$406+30%$188 – $866
Missouri MO33$387+24%$289 – $517
California CA41$384+23%$135 – $806
Colorado CO17$345+10%$320 – $813
Pennsylvania PA37$327+5%$151 – $1,955
Kentucky KY23$319+2%$193 – $702
North Carolina NC37$3120%$250 – $421
Kansas KS14$307−1%$169 – $1,115
Indiana IN28$306−2%$218 – $439
Oklahoma OK31$305−2%$162 – $412
Louisiana LA13$300−4%$242 – $495
New York NY35$290−7%$193 – $566
Texas TX80$290−7%$142 – $364
Virginia VA30$277−11%$166 – $460
Michigan MI45$267−15%$143 – $590
Washington WA28$253−19%$112 – $535
Florida FL37$226−28%$106 – $257
Georgia GA56$217−30%$163 – $422
Minnesota MN39$213−32%$96 – $553
New Jersey NJ36$213−32%$193 – $331
Iowa IA14$186−41%$186 – $186
Tennessee TN32$168−46%$165 – $251
Mississippi MS15$133−57%$112 – $298
Connecticut CT7not enough hospitals filed a usable price
Maine ME7not enough hospitals filed a usable price
West Virginia WV7not enough hospitals filed a usable price
Alabama AL5not enough hospitals filed a usable price
Hawaii HI4not enough hospitals filed a usable price
North Dakota ND4not enough hospitals filed a usable price
New Hampshire NH4not enough hospitals filed a usable price
Nevada NV4not enough hospitals filed a usable price
Nebraska NE3not enough hospitals filed a usable price
New Mexico NM3not enough hospitals filed a usable price
Alaska AK2not enough hospitals filed a usable price
Delaware DE2not enough hospitals filed a usable price
Montana MT1not enough hospitals filed a usable price
Rhode Island RI1not enough hospitals filed a usable price
South Dakota SD1not enough hospitals filed a usable price
Wyoming WY1not enough hospitals filed a usable price

Hospitals like yours

The same distribution cut by the kind of hospital. Hospital type and ownership come from CMS; a hospital counts as part of a system when its price file is shared with at least one other hospital under the same brand. The national median is $312.

Cash price by hospital segment. A segment needs at least 20 hospitals to show a figure.
SegmentHospitalsMedian20th–80th
Hospital type
Acute care921$305$177 – $612
Children’s16fewer than 20 hospitals
Critical access162$399$199 – $600
Ownership
For-profit99$300$163 – $894
Government125$250$155 – $421
Non-profit875$330$186 – $611
System affiliation
Part of a system1,017$314$182 – $610
Independent88$285$159 – $618

Cash price vs list price

Median list price (chargemaster)$586
Median cash price$312
Cash as a share of list, median hospital60%

At the typical hospital, asking for the cash price cuts the list price by about 40%. The share is the median of each hospital’s own cash ÷ list ratio, over hospitals that filed both — not the ratio of the two medians above.

The same procedure, inpatient

862 hospitals filed a usable inpatient cash price for this code. The median is $329 and the average of the middle 60% is $360; most fall between $169 and $624.

Cash price percentiles, inpatient, across 862 hospitals. Each figure is a price a hospital filed. 10th: one in ten hospitals charges less; 25th: a quarter charge less; Median: half charge less; 75th: three quarters charge less; 90th: nine in ten charge less.
10th25thMedian75th90th
$142$193$329$580$811

The most expensive tenth of hospitals charges at least 5.7× what the cheapest tenth charges ($142 vs $811).

Of the 921 hospitals that filed this code inpatient, 862 gave a usable cash price; 34 carried a plausibility flag, 0 filed a number their own filing marks as not a price, 0 gave an estimate, and 25 a list price only.

How complete is this

1,105 of the 3,956 hospitals with a price file in our corpus (28%) filed a usable outpatient cash price for this code, and those are the hospitals every figure on this page is computed from.

What the 1,171 hospitals that filed this code at all gave us
Usable cash price — counted1,105
Cash price carrying a plausibility flag — shown on the compare tool, excluded here40
A number the filing itself marks as not a price (a placeholder, a ratio) — excluded2
An estimate rather than a filed cash price — excluded0
A list price only, no cash figure — excluded24
Hospitals that filed this code1,171

Sections not shown for this setting

  • Against Medicare: Medicare has no separately payable national outpatient (OPPS) rate for this code, so there is nothing honest to compare against.
  • Since our last snapshot: there is no earlier snapshot at least 90 days older than this one yet.

We last checked these hospitals’ price files for changes between September 4, 2026 and September 25, 2026; the figures were computed September 25, 2026 from filings loaded through September 25, 2026. The percentiles and averages use only the “counted” row.

Related procedures

Part of the Pathology family.

Hospitals file this code under descriptions such as HC Idh1 Ngs.

Method

Source
The machine-readable price files every U.S. hospital is required by CMS to publish, parsed per hospital. Nothing is surveyed, sampled or modelled.
What counts
One cash (self-pay) price per hospital for this code and setting. A hospital’s own filing can rule its number out — a placeholder, a “not applicable” note, a list price standing in for cash — and our plausibility checks can flag a price far below what every other hospital files. Both kinds are disclosed above and excluded from the statistics; on the compare tool a flagged price is still shown.
Statistics
Percentiles are discrete: each is a price some hospital filed. The average is the mean of the prices between the 20th and 80th percentiles. We never publish the plain mean, the minimum or the maximum. A state needs 10 hospitals and a segment 20 to show a figure; otherwise the row shows its count and no number. Medicare is the national unadjusted OPPS rate where one exists.
Names
Procedure names on these pages are our own plain-language titles, not the AMA’s copyrighted CPT descriptors. The code is the identity.

The full rules — sources, statistics, thresholds, limitations — are on the methodology page.

Download this page’s figures: JSON · CSV. Aggregates only — the per-hospital prices are on the compare tool.

Cite: HospitalRates.com, “IDH1 gene test for common changes (CPT 81120) — cash price report,” computed September 25, 2026. https://hospitalrates.com/procedures/cpt-81120-idh1-gene-test-for-common-changes