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Procedure price report · Other Laboratory

Gel immunodiffusion antibody test, per antigen

CPT 86331the billing code this page is about

A gel-based laboratory test that shows whether antibody to one particular antigen is present; the charge applies to each antigen tested, such as the fungus that causes valley fever.

Hospitals typically charge $38 cash for this outpatient procedure — the median across 2,419 hospitals that filed a usable cash price; the average of the middle 60% is $42. Most fall between $16 and $83 (20th–80th percentile).

Hospitals
2,419
States
50
Filings dated
Aug 2022 – 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 2,419 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
$10$20$38$70$133

The most expensive tenth of hospitals charges at least 14× what the cheapest tenth charges ($10 vs $133).

How the prices are spread

$6 – $9: 112 hospitals$6$9 – $13: 96 hospitals$13 – $18: 217 hospitals$13$18 – $25: 273 hospitals$25 – $35: 324 hospitals$25$35 – $50: 285 hospitals$50 – $70: 384 hospitals$50$70 – $98: 249 hospitals$98 – $138: 132 hospitals$98$138 – $194: 108 hospitals$138median $38price bands are equal on a log scale
Hospitals per price band (2,180 of 2,419 — the bands cover the 5th to 95th percentile)
FromToHospitals
$6$9112
$9$1396
$13$18217
$18$25273
$25$35324
$35$50285
$50$70384
$70$98249
$98$138132
$138$194108

By state

The median cash price in each state, against the national median of $38.

Alaska: median $24 across 11 hospitalsAK$24Maine: median $47 across 18 hospitalsME$47Vermont: 7 hospitals filed a usable price — fewer than 10, so no figureVTNew Hampshire: median $38 across 22 hospitalsNH$38Washington: median $53 across 61 hospitalsWA$53Idaho: median $52 across 17 hospitalsID$52Montana: 9 hospitals filed a usable price — fewer than 10, so no figureMTNorth Dakota: median $30 across 20 hospitalsND$30Minnesota: median $33 across 71 hospitalsMN$33Illinois: median $63 across 105 hospitalsIL$63Wisconsin: median $60 across 84 hospitalsWI$60Michigan: median $16 across 67 hospitalsMI$16New York: median $24 across 86 hospitalsNY$24Massachusetts: median $55 across 43 hospitalsMA$55Oregon: median $27 across 37 hospitalsOR$27Nevada: median $59 across 15 hospitalsNV$59Wyoming: 9 hospitals filed a usable price — fewer than 10, so no figureWYSouth Dakota: median $37 across 20 hospitalsSD$37Iowa: median $48 across 48 hospitalsIA$48Indiana: median $37 across 88 hospitalsIN$37Ohio: median $50 across 121 hospitalsOH$50Pennsylvania: median $50 across 113 hospitalsPA$50New Jersey: median $14 across 52 hospitalsNJ$14Connecticut: median $44 across 12 hospitalsCT$44Rhode Island: median $32 across 10 hospitalsRI$32California: median $22 across 108 hospitalsCA$22Utah: median $30 across 34 hospitalsUT$30Colorado: median $42 across 46 hospitalsCO$42Nebraska: median $47 across 39 hospitalsNE$47Missouri: median $49 across 56 hospitalsMO$49Kentucky: median $33 across 52 hospitalsKY$33West Virginia: median $14 across 33 hospitalsWV$14Virginia: median $50 across 70 hospitalsVA$50Maryland: median $52 across 38 hospitalsMD$52Delaware: 6 hospitals filed a usable price — fewer than 10, so no figureDEArizona: median $35 across 33 hospitalsAZ$35New Mexico: median $47 across 14 hospitalsNM$47Kansas: median $79 across 49 hospitalsKS$79Arkansas: median $43 across 18 hospitalsAR$43Tennessee: median $29 across 58 hospitalsTN$29North Carolina: median $30 across 76 hospitalsNC$30South Carolina: median $61 across 48 hospitalsSC$61Oklahoma: median $26 across 45 hospitalsOK$26Louisiana: median $28 across 34 hospitalsLA$28Mississippi: median $30 across 29 hospitalsMS$30Alabama: median $19 across 23 hospitalsAL$19Georgia: median $52 across 77 hospitalsGA$52Hawaii: median $59 across 13 hospitalsHI$59Texas: median $23 across 174 hospitalsTX$23Florida: median $28 across 100 hospitalsFL$28
Cash price by state, most expensive first. National median $38. A state needs at least 10 hospitals with a usable price to show a figure.
StateHospitalsMedianvs national20th–80th
Kansas KS49$79+109%$37 – $122
Illinois IL105$63+67%$25 – $104
South Carolina SC48$61+62%$31 – $161
Wisconsin WI84$60+59%$39 – $93
Hawaii HI13$59+56%$26 – $101
Nevada NV15$59+56%$11 – $85
Massachusetts MA43$55+46%$31 – $107
Washington WA61$53+40%$25 – $68
Idaho ID17$52+38%$8 – $56
Georgia GA77$52+38%$25 – $125
Maryland MD38$52+37%$40 – $62
Virginia VA70$50+33%$20 – $119
Ohio OH121$50+33%$24 – $72
Pennsylvania PA113$50+31%$18 – $100
Missouri MO56$49+30%$25 – $80
Iowa IA48$48+27%$26 – $53
Maine ME18$47+25%$19 – $137
Nebraska NE39$47+24%$17 – $94
New Mexico NM14$47+24%$34 – $127
Connecticut CT12$44+16%$33 – $53
Arkansas AR18$43+13%$18 – $71
Colorado CO46$42+10%$29 – $150
New Hampshire NH22$380%$14 – $162
South Dakota SD20$37−2%$25 – $77
Indiana IN88$37−3%$22 – $58
Arizona AZ33$35−7%$13 – $131
Minnesota MN71$33−14%$12 – $68
Kentucky KY52$33−14%$20 – $97
Rhode Island RI10$32−14%$19 – $96
North Dakota ND20$30−20%$20 – $69
North Carolina NC76$30−20%$16 – $89
Utah UT34$30−22%$25 – $33
Mississippi MS29$30−22%$17 – $35
Tennessee TN58$29−22%$20 – $70
Louisiana LA34$28−26%$15 – $62
Florida FL100$28−26%$12 – $57
Oregon OR37$27−27%$5 – $53
Oklahoma OK45$26−32%$15 – $53
Alaska AK11$24−35%$15 – $136
New York NY86$24−36%$12 – $51
Texas TX174$23−39%$7 – $142
California CA108$22−42%$5 – $58
Alabama AL23$19−49%$13 – $85
Michigan MI67$16−59%$5 – $65
West Virginia WV33$14−62%$9 – $40
New Jersey NJ52$14−64%$13 – $25
Montana MT9not enough hospitals filed a usable price
Wyoming WY9not enough hospitals filed a usable price
Vermont VT7not enough hospitals filed a usable price
Delaware DE6not 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 $38.

Cash price by hospital segment. A segment needs at least 20 hospitals to show a figure.
SegmentHospitalsMedian20th–80th
Hospital type
Acute care1,851$36$14 – $78
Children’s35$26$14 – $84
Critical access524$46$22 – $93
Ownership
For-profit328$46$20 – $142
Government355$39$17 – $83
Non-profit1,727$36$15 – $75
System affiliation
Part of a system2,047$37$15 – $83
Independent372$41$19 – $85

Cash price vs list price

Median list price (chargemaster)$68
Median cash price$38
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

1,730 hospitals filed a usable inpatient cash price for this code. The median is $39 and the average of the middle 60% is $43; most fall between $17 and $83.

Cash price percentiles, inpatient, across 1,730 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
$10$22$39$69$124

The most expensive tenth of hospitals charges at least 12× what the cheapest tenth charges ($10 vs $124).

Of the 1,905 hospitals that filed this code inpatient, 1,730 gave a usable cash price; 98 carried a plausibility flag, 0 filed a number their own filing marks as not a price, 0 gave an estimate, and 77 a list price only.

How complete is this

2,419 of the 3,956 hospitals with a price file in our corpus (61%) filed a usable outpatient cash price for this code, and those are the hospitals every figure on this page is computed from.

What the 2,644 hospitals that filed this code at all gave us
Usable cash price — counted2,419
Cash price carrying a plausibility flag — shown on the compare tool, excluded here131
A number the filing itself marks as not a price (a placeholder, a ratio) — excluded0
An estimate rather than a filed cash price — excluded1
A list price only, no cash figure — excluded93
Hospitals that filed this code2,644

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 Other Laboratory family.

Hospitals file this code under descriptions such as HC Cockatoo Droppings Gel Diffusion.

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, “Gel immunodiffusion antibody test, per antigen (CPT 86331) — cash price report,” computed September 25, 2026. https://hospitalrates.com/procedures/cpt-86331-gel-immunodiffusion-antibody-test-per-antigen