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Procedure price report · Laboratory - Chemistry and Hematology

Free thyroxine (free T4) blood test

CPT 84439the billing code this page is about

A blood test that measures the unbound form of the thyroid hormone thyroxine.

Hospitals typically charge $61 cash for this outpatient procedure — the median across 3,403 hospitals that filed a usable cash price; the average of the middle 60% is $65. Most fall between $24 and $123 (20th–80th percentile).

Hospitals
3,403
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 3,403 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
$14$31$61$107$186

The most expensive tenth of hospitals charges at least 14× what the cheapest tenth charges ($14 vs $186).

How the prices are spread

$9 – $13: 152 hospitals$9$13 – $18: 171 hospitals$18 – $25: 223 hospitals$18$25 – $36: 296 hospitals$36 – $51: 459 hospitals$36$51 – $72: 468 hospitals$72 – $101: 533 hospitals$72$101 – $143: 408 hospitals$143 – $202: 218 hospitals$143$202 – $285: 152 hospitals$202median $61price bands are equal on a log scale
Hospitals per price band (3,080 of 3,403 — the bands cover the 5th to 95th percentile)
FromToHospitals
$9$13152
$13$18171
$18$25223
$25$36296
$36$51459
$51$72468
$72$101533
$101$143408
$143$202218
$202$285152

By state

The median cash price in each state, against the national median of $61.

Alaska: median $118 across 19 hospitalsAK$118Maine: median $58 across 28 hospitalsME$58Vermont: median $87 across 14 hospitalsVT$87New Hampshire: median $80 across 25 hospitalsNH$80Washington: median $64 across 77 hospitalsWA$64Idaho: median $42 across 25 hospitalsID$42Montana: median $68 across 34 hospitalsMT$68North Dakota: median $59 across 33 hospitalsND$59Minnesota: median $55 across 106 hospitalsMN$55Illinois: median $117 across 141 hospitalsIL$117Wisconsin: median $81 across 107 hospitalsWI$81Michigan: median $26 across 102 hospitalsMI$26New York: median $38 across 120 hospitalsNY$38Massachusetts: median $77 across 54 hospitalsMA$77Oregon: median $47 across 51 hospitalsOR$47Nevada: median $77 across 22 hospitalsNV$77Wyoming: median $46 across 16 hospitalsWY$46South Dakota: median $123 across 41 hospitalsSD$123Iowa: median $69 across 90 hospitalsIA$69Indiana: median $67 across 95 hospitalsIN$67Ohio: median $41 across 143 hospitalsOH$41Pennsylvania: median $48 across 122 hospitalsPA$48New Jersey: median $10 across 56 hospitalsNJ$10Connecticut: median $51 across 23 hospitalsCT$51Rhode Island: median $72 across 10 hospitalsRI$72California: median $57 across 161 hospitalsCA$57Utah: median $49 across 43 hospitalsUT$49Colorado: median $75 across 71 hospitalsCO$75Nebraska: median $87 across 85 hospitalsNE$87Missouri: median $61 across 78 hospitalsMO$61Kentucky: median $66 across 68 hospitalsKY$66West Virginia: median $36 across 43 hospitalsWV$36Virginia: median $78 across 72 hospitalsVA$78Maryland: median $41 across 41 hospitalsMD$41Delaware: 7 hospitals filed a usable price — fewer than 10, so no figureDEArizona: median $67 across 42 hospitalsAZ$67New Mexico: median $116 across 30 hospitalsNM$116Kansas: median $57 across 91 hospitalsKS$57Arkansas: median $22 across 40 hospitalsAR$22Tennessee: median $34 across 83 hospitalsTN$34North Carolina: median $76 across 84 hospitalsNC$76South Carolina: median $107 across 53 hospitalsSC$107Oklahoma: median $61 across 73 hospitalsOK$61Louisiana: median $33 across 51 hospitalsLA$33Mississippi: median $32 across 54 hospitalsMS$32Alabama: median $60 across 43 hospitalsAL$60Georgia: median $60 across 112 hospitalsGA$60Hawaii: median $72 across 21 hospitalsHI$72Texas: median $69 across 251 hospitalsTX$69Florida: median $78 across 152 hospitalsFL$78
Cash price by state, most expensive first. National median $61. A state needs at least 10 hospitals with a usable price to show a figure.
StateHospitalsMedianvs national20th–80th
South Dakota SD41$123+100%$79 – $180
Alaska AK19$118+92%$16 – $209
Illinois IL141$117+91%$57 – $175
New Mexico NM30$116+90%$43 – $138
South Carolina SC53$107+75%$47 – $124
Nebraska NE85$87+42%$41 – $123
Vermont VT14$87+42%$26 – $155
Wisconsin WI107$81+32%$45 – $101
New Hampshire NH25$80+31%$26 – $146
Florida FL152$78+28%$20 – $243
Virginia VA72$78+27%$41 – $114
Nevada NV22$77+26%$28 – $171
Massachusetts MA54$77+26%$34 – $113
North Carolina NC84$76+25%$35 – $142
Colorado CO71$75+23%$49 – $139
Rhode Island RI10$72+18%$31 – $92
Hawaii HI21$72+18%$44 – $98
Iowa IA90$69+13%$44 – $94
Texas TX251$69+12%$33 – $285
Montana MT34$68+11%$35 – $103
Arizona AZ42$67+9%$16 – $272
Indiana IN95$67+9%$17 – $131
Kentucky KY68$66+7%$34 – $115
Washington WA77$64+4%$40 – $105
Oklahoma OK73$610%$31 – $91
Missouri MO78$61−1%$40 – $125
Georgia GA112$60−2%$35 – $137
Alabama AL43$60−2%$23 – $204
North Dakota ND33$59−4%$17 – $79
Maine ME28$58−6%$27 – $96
Kansas KS91$57−7%$37 – $92
California CA161$57−8%$9 – $185
Minnesota MN106$55−10%$27 – $88
Connecticut CT23$51−17%$38 – $99
Utah UT43$49−20%$42 – $106
Pennsylvania PA122$48−22%$14 – $143
Oregon OR51$47−24%$32 – $82
Wyoming WY16$46−25%$17 – $136
Idaho ID25$42−32%$37 – $68
Ohio OH143$41−33%$28 – $82
Maryland MD41$41−33%$31 – $49
New York NY120$38−38%$14 – $111
West Virginia WV43$36−41%$8 – $97
Tennessee TN83$34−45%$18 – $80
Louisiana LA51$33−46%$18 – $81
Mississippi MS54$32−48%$15 – $57
Michigan MI102$26−58%$14 – $78
Arkansas AR40$22−65%$12 – $51
New Jersey NJ56$10−83%$10 – $38
Delaware DE7not 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 $61.

Cash price by hospital segment. A segment needs at least 20 hospitals to show a figure.
SegmentHospitalsMedian20th–80th
Hospital type
Acute care2,328$56$22 – $131
Children’s66$74$32 – $120
Critical access999$70$35 – $113
Ownership
For-profit474$80$26 – $296
Government651$68$27 – $120
Non-profit2,268$57$24 – $113
System affiliation
Part of a system2,746$60$24 – $125
Independent657$63$29 – $118

Cash price vs list price

Median list price (chargemaster)$102
Median cash price$61
Cash as a share of list, median hospital65%

At the typical hospital, asking for the cash price cuts the list price by about 35%. 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

2,290 hospitals filed a usable inpatient cash price for this code. The median is $61 and the average of the middle 60% is $64; most fall between $26 and $121.

Cash price percentiles, inpatient, across 2,290 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
$15$33$61$104$170

The most expensive tenth of hospitals charges at least 11× what the cheapest tenth charges ($15 vs $170).

Of the 2,530 hospitals that filed this code inpatient, 2,290 gave a usable cash price; 128 carried a plausibility flag, 0 filed a number their own filing marks as not a price, 0 gave an estimate, and 112 a list price only.

How complete is this

3,403 of the 3,956 hospitals with a price file in our corpus (86%) filed a usable outpatient cash price for this code, and those are the hospitals every figure on this page is computed from.

What the 3,721 hospitals that filed this code at all gave us
Usable cash price — counted3,403
Cash price carrying a plausibility flag — shown on the compare tool, excluded here182
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 — excluded135
Hospitals that filed this code3,721

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 July 20, 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 Laboratory - Chemistry and Hematology family.

Hospitals file this code under descriptions such as HC Free T4(Free Thyroxine).

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, “Free thyroxine (free T4) blood test (CPT 84439) — cash price report,” computed September 25, 2026. https://hospitalrates.com/procedures/cpt-84439-free-thyroxine-free-t4-blood-test