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Procedure price report · Pathology

ATN1 gene test for repeat expansion

CPT 81177the billing code this page is about

Laboratory test of the ATN1 gene to detect abnormally expanded DNA repeat sections, the change linked to a hereditary movement disorder.

Hospitals typically charge $288 cash for this outpatient procedure — the median across 382 hospitals that filed a usable cash price; the average of the middle 60% is $268. Most fall between $114 and $418 (20th–80th percentile).

Hospitals
382
States
35
Filings dated
Apr 2025 – Sep 2026
Computed
September 25, 2026
Prices checked
through September 24, 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 382 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
$78$137$288$413$481

The most expensive tenth of hospitals charges at least 6.2× what the cheapest tenth charges ($78 vs $481).

How the prices are spread

$53 – $70: 16 hospitals$53$70 – $93: 9 hospitals$93 – $123: 35 hospitals$93$123 – $164: 45 hospitals$164 – $217: 39 hospitals$164$217 – $288: 26 hospitals$288 – $382: 92 hospitals$288$382 – $506: 63 hospitals$506 – $672: 15 hospitals$506$672 – $891: 4 hospitals$672median $288price bands are equal on a log scale
Hospitals per price band (344 of 382 — the bands cover the 5th to 95th percentile)
FromToHospitals
$53$7016
$70$939
$93$12335
$123$16445
$164$21739
$217$28826
$288$38292
$382$50663
$506$67215
$672$8914

By state

The median cash price in each state, against the national median of $288.

Alaska: no hospital in the corpus filed a usable priceAKMaine: no hospital in the corpus filed a usable priceMEVermont: no hospital in the corpus filed a usable priceVTNew Hampshire: no hospital in the corpus filed a usable priceNHWashington: 9 hospitals filed a usable price — fewer than 10, so no figureWAIdaho: no hospital in the corpus filed a usable priceIDMontana: no hospital in the corpus filed a usable priceMTNorth Dakota: no hospital in the corpus filed a usable priceNDMinnesota: median $335 across 18 hospitalsMN$335Illinois: median $304 across 14 hospitalsIL$304Wisconsin: median $418 across 27 hospitalsWI$418Michigan: 9 hospitals filed a usable price — fewer than 10, so no figureMINew York: median $137 across 19 hospitalsNY$137Massachusetts: 8 hospitals filed a usable price — fewer than 10, so no figureMAOregon: 1 hospital filed a usable price — fewer than 10, so no figureORNevada: 3 hospitals filed a usable price — fewer than 10, so no figureNVWyoming: no hospital in the corpus filed a usable priceWYSouth Dakota: no hospital in the corpus filed a usable priceSDIowa: no hospital in the corpus filed a usable priceIAIndiana: median $198 across 14 hospitalsIN$198Ohio: median $534 across 36 hospitalsOH$534Pennsylvania: median $206 across 19 hospitalsPA$206New Jersey: median $151 across 23 hospitalsNJ$151Connecticut: no hospital in the corpus filed a usable priceCTRhode Island: no hospital in the corpus filed a usable priceRICalifornia: median $314 across 21 hospitalsCA$314Utah: no hospital in the corpus filed a usable priceUTColorado: 3 hospitals filed a usable price — fewer than 10, so no figureCONebraska: no hospital in the corpus filed a usable priceNEMissouri: 4 hospitals filed a usable price — fewer than 10, so no figureMOKentucky: median $303 across 10 hospitalsKY$303West Virginia: 2 hospitals filed a usable price — fewer than 10, so no figureWVVirginia: median $108 across 11 hospitalsVA$108Maryland: 4 hospitals filed a usable price — fewer than 10, so no figureMDDelaware: no hospital in the corpus filed a usable priceDEArizona: 2 hospitals filed a usable price — fewer than 10, so no figureAZNew Mexico: 1 hospital filed a usable price — fewer than 10, so no figureNMKansas: 4 hospitals filed a usable price — fewer than 10, so no figureKSArkansas: 3 hospitals filed a usable price — fewer than 10, so no figureARTennessee: median $108 across 16 hospitalsTN$108North Carolina: median $44 across 11 hospitalsNC$44South Carolina: median $288 across 16 hospitalsSC$288Oklahoma: 8 hospitals filed a usable price — fewer than 10, so no figureOKLouisiana: 3 hospitals filed a usable price — fewer than 10, so no figureLAMississippi: 1 hospital filed a usable price — fewer than 10, so no figureMSAlabama: 1 hospital filed a usable price — fewer than 10, so no figureALGeorgia: median $67 across 13 hospitalsGA$67Hawaii: 1 hospital filed a usable price — fewer than 10, so no figureHITexas: median $372 across 41 hospitalsTX$372Florida: 6 hospitals filed a usable price — fewer than 10, so no figureFL
Cash price by state, most expensive first. National median $288. A state needs at least 10 hospitals with a usable price to show a figure.
StateHospitalsMedianvs national20th–80th
Ohio OH36$534+85%$481 – $1,160
Wisconsin WI27$418+45%$308 – $450
Texas TX41$372+29%$372 – $413
Minnesota MN18$335+16%$98 – $440
California CA21$314+9%$314 – $314
Illinois IL14$304+6%$192 – $316
Kentucky KY10$303+5%$303 – $303
South Carolina SC16$2880%$217 – $288
Pennsylvania PA19$206−29%$91 – $295
Indiana IN14$198−31%$172 – $282
New Jersey NJ23$151−48%$137 – $151
New York NY19$137−52%$137 – $204
Tennessee TN16$108−63%$47 – $108
Virginia VA11$108−63%$108 – $167
Georgia GA13$67−77%$67 – $214
North Carolina NC11$44−85%$44 – $53
Michigan MI9not enough hospitals filed a usable price
Washington WA9not enough hospitals filed a usable price
Massachusetts MA8not enough hospitals filed a usable price
Oklahoma OK8not enough hospitals filed a usable price
Florida FL6not enough hospitals filed a usable price
Kansas KS4not enough hospitals filed a usable price
Maryland MD4not enough hospitals filed a usable price
Missouri MO4not enough hospitals filed a usable price
Arkansas AR3not enough hospitals filed a usable price
Colorado CO3not enough hospitals filed a usable price
Louisiana LA3not enough hospitals filed a usable price
Nevada NV3not enough hospitals filed a usable price
Arizona AZ2not enough hospitals filed a usable price
West Virginia WV2not enough hospitals filed a usable price
Alabama AL1not enough hospitals filed a usable price
Hawaii HI1not enough hospitals filed a usable price
Mississippi MS1not enough hospitals filed a usable price
New Mexico NM1not enough hospitals filed a usable price
Oregon OR1not 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 $288.

Cash price by hospital segment. A segment needs at least 20 hospitals to show a figure.
SegmentHospitalsMedian20th–80th
Hospital type
Acute care309$248$108 – $413
Children’s10fewer than 20 hospitals
Critical access60$369$167 – $450
Ownership
For-profit21$372$67 – $372
Government38$137$112 – $312
Non-profit320$288$135 – $428
System affiliation
Part of a system346$288$112 – $418
Independent36$205$135 – $406

Cash price vs list price

Median list price (chargemaster)$500
Median cash price$288
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

265 hospitals filed a usable inpatient cash price for this code. The median is $372 and the average of the middle 60% is $342; most fall between $137 and $481.

Cash price percentiles, inpatient, across 265 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
$98$189$372$440$614

The most expensive tenth of hospitals charges at least 6.3× what the cheapest tenth charges ($98 vs $614).

Of the 272 hospitals that filed this code inpatient, 265 gave a usable cash price; 3 carried a plausibility flag, 0 filed a number their own filing marks as not a price, 0 gave an estimate, and 4 a list price only.

How complete is this

382 of the 3,956 hospitals with a price file in our corpus (10%) filed a usable outpatient cash price for this code, and those are the hospitals every figure on this page is computed from.

What the 389 hospitals that filed this code at all gave us
Usable cash price — counted382
Cash price carrying a plausibility flag — shown on the compare tool, excluded here4
A number the filing itself marks as not a price (a placeholder, a ratio) — excluded1
An estimate rather than a filed cash price — excluded0
A list price only, no cash figure — excluded2
Hospitals that filed this code389

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 5, 2026 and September 24, 2026; the figures were computed September 25, 2026 from filings loaded through September 23, 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 ATN1 GENE DETC ABNOR ALLELES.

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, “ATN1 gene test for repeat expansion (CPT 81177) — cash price report,” computed September 25, 2026. https://hospitalrates.com/procedures/cpt-81177-atn1-gene-test-for-repeat-expansion