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Procedure price report · Laboratory - Chemistry and Hematology

Phosphorus blood test

CPT 84100the billing code this page is about

Measures the amount of inorganic phosphorus (phosphate) in a blood sample.

Hospitals typically charge $38 cash for this outpatient procedure — the median across 3,395 hospitals that filed a usable cash price; the average of the middle 60% is $40. Most fall between $16 and $75 (20th–80th percentile).

Hospitals
3,395
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 3,395 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
$9$20$38$65$126

The most expensive tenth of hospitals charges at least 14× what the cheapest tenth charges ($9 vs $126).

How the prices are spread

$5 – $8: 108 hospitals$5$8 – $11: 170 hospitals$11 – $16: 266 hospitals$11$16 – $23: 316 hospitals$23 – $33: 443 hospitals$23$33 – $47: 585 hospitals$47 – $67: 546 hospitals$47$67 – $96: 343 hospitals$96 – $137: 160 hospitals$96$137 – $196: 137 hospitals$137median $38price bands are equal on a log scale
Hospitals per price band (3,074 of 3,395 — the bands cover the 5th to 95th percentile)
FromToHospitals
$5$8108
$8$11170
$11$16266
$16$23316
$23$33443
$33$47585
$47$67546
$67$96343
$96$137160
$137$196137

By state

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

Alaska: median $72 across 19 hospitalsAK$72Maine: median $27 across 28 hospitalsME$27Vermont: median $40 across 14 hospitalsVT$40New Hampshire: median $37 across 25 hospitalsNH$37Washington: median $38 across 77 hospitalsWA$38Idaho: median $30 across 25 hospitalsID$30Montana: median $47 across 33 hospitalsMT$47North Dakota: median $34 across 33 hospitalsND$34Minnesota: median $32 across 106 hospitalsMN$32Illinois: median $62 across 143 hospitalsIL$62Wisconsin: median $42 across 107 hospitalsWI$42Michigan: median $21 across 96 hospitalsMI$21New York: median $19 across 119 hospitalsNY$19Massachusetts: median $34 across 54 hospitalsMA$34Oregon: median $28 across 51 hospitalsOR$28Nevada: median $53 across 22 hospitalsNV$53Wyoming: median $38 across 16 hospitalsWY$38South Dakota: median $88 across 41 hospitalsSD$88Iowa: median $39 across 90 hospitalsIA$39Indiana: median $27 across 96 hospitalsIN$27Ohio: median $36 across 141 hospitalsOH$36Pennsylvania: median $24 across 122 hospitalsPA$24New Jersey: median $5 across 54 hospitalsNJ$5Connecticut: median $23 across 23 hospitalsCT$23Rhode Island: median $39 across 10 hospitalsRI$39California: median $76 across 163 hospitalsCA$76Utah: median $46 across 42 hospitalsUT$46Colorado: median $44 across 71 hospitalsCO$44Nebraska: median $55 across 83 hospitalsNE$55Missouri: median $33 across 78 hospitalsMO$33Kentucky: median $50 across 69 hospitalsKY$50West Virginia: median $31 across 44 hospitalsWV$31Virginia: median $47 across 73 hospitalsVA$47Maryland: median $5 across 41 hospitalsMD$5Delaware: 7 hospitals filed a usable price — fewer than 10, so no figureDEArizona: median $48 across 42 hospitalsAZ$48New Mexico: median $56 across 29 hospitalsNM$56Kansas: median $35 across 93 hospitalsKS$35Arkansas: median $15 across 39 hospitalsAR$15Tennessee: median $19 across 83 hospitalsTN$19North Carolina: median $35 across 87 hospitalsNC$35South Carolina: median $45 across 53 hospitalsSC$45Oklahoma: median $26 across 72 hospitalsOK$26Louisiana: median $20 across 53 hospitalsLA$20Mississippi: median $21 across 54 hospitalsMS$21Alabama: median $24 across 44 hospitalsAL$24Georgia: median $35 across 108 hospitalsGA$35Hawaii: median $44 across 21 hospitalsHI$44Texas: median $63 across 247 hospitalsTX$63Florida: median $75 across 154 hospitalsFL$75
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
South Dakota SD41$88+131%$54 – $132
California CA163$76+98%$13 – $142
Florida FL154$75+96%$15 – $378
Alaska AK19$72+89%$49 – $90
Texas TX247$63+65%$23 – $162
Illinois IL143$62+63%$35 – $93
New Mexico NM29$56+47%$24 – $94
Nebraska NE83$55+43%$23 – $79
Nevada NV22$53+39%$25 – $104
Kentucky KY69$50+32%$28 – $74
Arizona AZ42$48+26%$15 – $212
Montana MT33$47+24%$26 – $71
Virginia VA73$47+23%$28 – $83
Utah UT42$46+20%$39 – $68
South Carolina SC53$45+17%$32 – $56
Colorado CO71$44+15%$26 – $70
Hawaii HI21$44+14%$28 – $48
Wisconsin WI107$42+9%$23 – $51
Vermont VT14$40+4%$25 – $82
Iowa IA90$39+2%$30 – $52
Rhode Island RI10$39+1%$13 – $50
Washington WA77$38+1%$22 – $64
Wyoming WY16$38+1%$29 – $81
New Hampshire NH25$37−4%$24 – $82
Ohio OH141$36−6%$20 – $58
Kansas KS93$35−8%$18 – $49
North Carolina NC87$35−8%$25 – $53
Georgia GA108$35−8%$15 – $80
North Dakota ND33$34−11%$30 – $43
Massachusetts MA54$34−12%$19 – $59
Missouri MO78$33−13%$19 – $70
Minnesota MN106$32−17%$15 – $62
West Virginia WV44$31−18%$19 – $51
Idaho ID25$30−20%$21 – $45
Oregon OR51$28−27%$15 – $45
Maine ME28$27−28%$14 – $87
Indiana IN96$27−30%$11 – $58
Oklahoma OK72$26−33%$14 – $52
Alabama AL44$24−37%$14 – $88
Pennsylvania PA122$24−37%$7 – $62
Connecticut CT23$23−39%$18 – $28
Mississippi MS54$21−44%$9 – $40
Michigan MI96$21−45%$14 – $35
Louisiana LA53$20−49%$8 – $46
Tennessee TN83$19−51%$10 – $56
New York NY119$19−51%$8 – $56
Arkansas AR39$15−62%$6 – $37
New Jersey NJ54$5−86%$5 – $22
Maryland MD41$5−86%$4 – $7
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 $38.

Cash price by hospital segment. A segment needs at least 20 hospitals to show a figure.
SegmentHospitalsMedian20th–80th
Hospital type
Acute care2,327$35$14 – $78
Children’s67$43$22 – $102
Critical access992$42$23 – $70
Ownership
For-profit473$66$20 – $227
Government651$40$19 – $66
Non-profit2,262$35$14 – $66
System affiliation
Part of a system2,738$39$15 – $76
Independent657$37$18 – $69

Cash price vs list price

Median list price (chargemaster)$64
Median cash price$38
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

2,281 hospitals filed a usable inpatient cash price for this code. The median is $39 and the average of the middle 60% is $40; most fall between $17 and $75.

Cash price percentiles, inpatient, across 2,281 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$21$39$63$108

The most expensive tenth of hospitals charges at least 11× what the cheapest tenth charges ($10 vs $108).

Of the 2,526 hospitals that filed this code inpatient, 2,281 gave a usable cash price; 132 carried a plausibility flag, 0 filed a number their own filing marks as not a price, 0 gave an estimate, and 113 a list price only.

How complete is this

3,395 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 3,709 hospitals that filed this code at all gave us
Usable cash price — counted3,395
Cash price carrying a plausibility flag — shown on the compare tool, excluded here178
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 code3,709

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 Phosphorous, Serum (Po4ct).

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, “Phosphorus blood test (CPT 84100) — cash price report,” computed September 25, 2026. https://hospitalrates.com/procedures/cpt-84100-phosphorus-blood-test