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Procedure price report · Microscopic examination (bacterial smear, culture, toxicology)

Extra chromosome maps added to a chromosome study

CPT 88280the billing code this page is about

Add-on charge for preparing additional karyotypes (chromosome maps) beyond those included in the main chromosome analysis; billed per study.

Hospitals typically charge $100 cash for this outpatient procedure — the median across 2,128 hospitals that filed a usable cash price; the average of the middle 60% is $106. Most fall between $41 and $212 (20th–80th percentile).

Hospitals
2,128
States
50
Filings dated
Mar 2023 – 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 2,128 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
$30$48$100$178$325

The most expensive tenth of hospitals charges at least 11× what the cheapest tenth charges ($30 vs $325).

How the prices are spread

$21 – $29: 96 hospitals$21$29 – $39: 186 hospitals$39 – $52: 196 hospitals$39$52 – $70: 212 hospitals$70 – $94: 226 hospitals$70$94 – $126: 252 hospitals$126 – $170: 288 hospitals$126$170 – $229: 173 hospitals$229 – $308: 161 hospitals$229$308 – $415: 129 hospitals$308median $100price bands are equal on a log scale
Hospitals per price band (1,919 of 2,128 — the bands cover the 5th to 95th percentile)
FromToHospitals
$21$2996
$29$39186
$39$52196
$52$70212
$70$94226
$94$126252
$126$170288
$170$229173
$229$308161
$308$415129

By state

The median cash price in each state, against the national median of $100.

Alaska: 7 hospitals filed a usable price — fewer than 10, so no figureAKMaine: median $93 across 16 hospitalsME$93Vermont: 5 hospitals filed a usable price — fewer than 10, so no figureVTNew Hampshire: median $158 across 13 hospitalsNH$158Washington: median $122 across 50 hospitalsWA$122Idaho: median $84 across 10 hospitalsID$84Montana: median $70 across 12 hospitalsMT$70North Dakota: 8 hospitals filed a usable price — fewer than 10, so no figureNDMinnesota: median $127 across 48 hospitalsMN$127Illinois: median $124 across 94 hospitalsIL$124Wisconsin: median $156 across 67 hospitalsWI$156Michigan: median $61 across 69 hospitalsMI$61New York: median $98 across 78 hospitalsNY$98Massachusetts: median $123 across 37 hospitalsMA$123Oregon: median $80 across 28 hospitalsOR$80Nevada: median $153 across 13 hospitalsNV$153Wyoming: 6 hospitals filed a usable price — fewer than 10, so no figureWYSouth Dakota: 3 hospitals filed a usable price — fewer than 10, so no figureSDIowa: median $120 across 34 hospitalsIA$120Indiana: median $76 across 76 hospitalsIN$76Ohio: median $68 across 107 hospitalsOH$68Pennsylvania: median $90 across 92 hospitalsPA$90New Jersey: median $37 across 43 hospitalsNJ$37Connecticut: median $113 across 20 hospitalsCT$113Rhode Island: 9 hospitals filed a usable price — fewer than 10, so no figureRICalifornia: median $50 across 100 hospitalsCA$50Utah: median $272 across 36 hospitalsUT$272Colorado: median $145 across 46 hospitalsCO$145Nebraska: median $147 across 42 hospitalsNE$147Missouri: median $94 across 55 hospitalsMO$94Kentucky: median $100 across 41 hospitalsKY$100West Virginia: median $94 across 16 hospitalsWV$94Virginia: median $134 across 62 hospitalsVA$134Maryland: median $53 across 31 hospitalsMD$53Delaware: 4 hospitals filed a usable price — fewer than 10, so no figureDEArizona: median $78 across 29 hospitalsAZ$78New Mexico: 7 hospitals filed a usable price — fewer than 10, so no figureNMKansas: median $182 across 39 hospitalsKS$182Arkansas: median $38 across 20 hospitalsAR$38Tennessee: median $61 across 65 hospitalsTN$61North Carolina: median $88 across 72 hospitalsNC$88South Carolina: median $170 across 34 hospitalsSC$170Oklahoma: median $63 across 36 hospitalsOK$63Louisiana: median $73 across 32 hospitalsLA$73Mississippi: median $53 across 41 hospitalsMS$53Alabama: median $82 across 29 hospitalsAL$82Georgia: median $132 across 67 hospitalsGA$132Hawaii: median $113 across 10 hospitalsHI$113Texas: median $120 across 165 hospitalsTX$120Florida: median $38 across 104 hospitalsFL$38
Cash price by state, most expensive first. National median $100. A state needs at least 10 hospitals with a usable price to show a figure.
StateHospitalsMedianvs national20th–80th
Utah UT36$272+172%$224 – $320
Kansas KS39$182+82%$97 – $527
South Carolina SC34$170+70%$93 – $201
New Hampshire NH13$158+58%$37 – $340
Wisconsin WI67$156+56%$90 – $269
Nevada NV13$153+53%$22 – $240
Nebraska NE42$147+47%$86 – $230
Colorado CO46$145+45%$73 – $350
Virginia VA62$134+34%$43 – $258
Georgia GA67$132+32%$62 – $181
Minnesota MN48$127+27%$91 – $306
Illinois IL94$124+24%$56 – $297
Massachusetts MA37$123+23%$74 – $212
Washington WA50$122+22%$53 – $168
Texas TX165$120+20%$49 – $395
Iowa IA34$120+20%$64 – $128
Connecticut CT20$113+13%$89 – $150
Hawaii HI10$113+13%$55 – $169
Kentucky KY41$1000%$55 – $343
New York NY78$98−2%$39 – $240
Missouri MO55$94−6%$58 – $199
West Virginia WV16$94−6%$60 – $158
Maine ME16$93−7%$42 – $193
Pennsylvania PA92$90−10%$34 – $229
North Carolina NC72$88−12%$40 – $176
Idaho ID10$84−16%$45 – $185
Alabama AL29$82−18%$45 – $178
Oregon OR28$80−20%$46 – $136
Arizona AZ29$78−22%$38 – $254
Indiana IN76$76−24%$49 – $197
Louisiana LA32$73−27%$17 – $118
Montana MT12$70−30%$38 – $112
Ohio OH107$68−32%$30 – $150
Oklahoma OK36$63−37%$41 – $120
Tennessee TN65$61−39%$39 – $176
Michigan MI69$61−39%$22 – $166
Mississippi MS41$53−47%$28 – $106
Maryland MD31$53−47%$42 – $64
California CA100$50−50%$21 – $236
Arkansas AR20$38−62%$38 – $108
Florida FL104$38−62%$20 – $123
New Jersey NJ43$37−63%$33 – $108
Rhode Island RI9not enough hospitals filed a usable price
North Dakota ND8not enough hospitals filed a usable price
Alaska AK7not enough hospitals filed a usable price
New Mexico NM7not enough hospitals filed a usable price
Wyoming WY6not enough hospitals filed a usable price
Vermont VT5not enough hospitals filed a usable price
Delaware DE4not enough hospitals filed a usable price
South Dakota SD3not 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 $100.

Cash price by hospital segment. A segment needs at least 20 hospitals to show a figure.
SegmentHospitalsMedian20th–80th
Hospital type
Acute care1,724$98$39 – $212
Children’s39$87$67 – $270
Critical access356$108$49 – $212
Ownership
For-profit314$132$56 – $395
Government289$100$40 – $180
Non-profit1,516$94$39 – $192
System affiliation
Part of a system1,817$100$40 – $212
Independent311$100$47 – $202

Cash price vs list price

Median list price (chargemaster)$171
Median cash price$100
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

1,509 hospitals filed a usable inpatient cash price for this code. The median is $108 and the average of the middle 60% is $110; most fall between $44 and $201.

Cash price percentiles, inpatient, across 1,509 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
$31$54$108$176$305

The most expensive tenth of hospitals charges at least 9.8× what the cheapest tenth charges ($31 vs $305).

Of the 1,681 hospitals that filed this code inpatient, 1,509 gave a usable cash price; 94 carried a plausibility flag, 0 filed a number their own filing marks as not a price, 0 gave an estimate, and 78 a list price only.

How complete is this

2,128 of the 3,956 hospitals with a price file in our corpus (54%) filed a usable outpatient cash price for this code, and those are the hospitals every figure on this page is computed from.

What the 2,332 hospitals that filed this code at all gave us
Usable cash price — counted2,128
Cash price carrying a plausibility flag — shown on the compare tool, excluded here118
A number the filing itself marks as not a price (a placeholder, a ratio) — excluded1
An estimate rather than a filed cash price — excluded1
A list price only, no cash figure — excluded84
Hospitals that filed this code2,332

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 Microscopic examination (bacterial smear, culture, toxicology) family.

Hospitals file this code under descriptions such as HC Additional Karyotypes.

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, “Extra chromosome maps added to a chromosome study (CPT 88280) — cash price report,” computed September 25, 2026. https://hospitalrates.com/procedures/cpt-88280-extra-chromosome-maps-added-to-a-chromosome-study